The University of Texas at Dallas
Chemistry Program - School of
Natural Sciences
and Mathematics
CALDWELL,
Richard A.
December
21, 2004
Professor
of Chemistry
PERSONAL
Born:
September 28, 1940 - Huntington, W. Va.
Married
Sarah Elisabeth (Betsie) Barr, November 14, 1964. Two daughters. Now widowed.
EDUCATION
B.Sc.,
Chemistry, Massachusetts Institute of Technology, 1961
Ph.D., Organic Chemistry, University of
California, Berkeley, 1965
FIELDS
OF RESEARCH SPECIALIZATION
Physical
organic chemistry; photochemical mechanisms, especially intersystem
crossing in
photochemical intermediates,
olefin triplet and biradical chemistry, and photocycloadditions
involving exciplexes. Study of nanosecond transients by
flash photolysis and time-resolved photoacoustic
calorimetry. Theories of photochemical reactivity.
Computational chemistry and biology.
EXPERIENCE
1964-1965 NSF
Postdoctoral Fellowship, California Institute of Technology (G. S.
Hammond,
Supervisor)
1965-1971
Cornell University, Assistant Professor, Chemistry Department
1971- present The University of Texas at Dallas, Associate Professor to Professor (from 1975) of Chemistry
1971-1976 Acting
Chairman, Chemistry Faculty; Head, Programs in Chemistry
1977-1978 Associate
Dean, School of Natural Sciences & Mathematics
1980-1984 Dean,
School
of Natural Sciences & Mathematics
1989-1991 Speaker
of
the University Faculty (Similar to Chairman of the Faculty Senate)
1995-1996 Program
Officer, Chemistry Division, National Science Foundation.
1996-1997 Guest
researcher NCI-SAIC, Frederick, Md. (Dr. S. K. Burt, Supervisor).
1997-
2003 Dean,
School of
Natural Sciences & Mathematics
AWARDS
AND FELLOWSHIPS
National
Merit Scholarship, 1957-1961 (MIT)
NSF
Cooperative Fellowship, 1962-1964 (Berkeley)
NSF
Postdoctoral Fellowship, 1964-1965 (Caltech)
NSF
Faculty Professional Development Leave, 1978-1979 (IBM San Jose
Research
Labs)
Japan
Society for the Promotion of Science, Fellowship May-June 1978 (Eight
Japanese
universities and industrial laboratories)
Wilfred
T. Doherty Award 1987
Narrative Professional Biography of
Richard A.
Caldwell
General.- Richard A.
Caldwell received
his B.S. from M.I.T. in 1961 and his Ph.D. from The University of
California
at Berkeley in 1965. After a
postdoctoral (1964-65) with George Hammond at Caltech he joined the
faculty of
Cornell University in 1965. He left in 1971 to join the faculty of the
newly created
(1969) University of Texas at Dallas, where he has remained ever since.
A
one-year (1978-79) leave on an NSF Senior Faculty Development Grant at
the IBM
Research Laboratories, San Jose, California, allowed him to observe and
participate in the conduct of research in industry.
He spent 1995-6 as a Program Officer in the Chemistry
Division of the National Science Foundation and 1996-7 as a Guest
Researcher at
the National Cancer Institute. He
is a member of the American Chemical Society.
Administrative
and University Service.-
Dr. Caldwell served
as the first Chairman/Head of Chemistry at UTD in 1971- 1976. During
this time
the basic planning for development of chemistry at UTD was
accomplished,
faculty were hired, laboratory planning and construction done, and the
foundation for a long- range fruitful interaction of UTD chemistry with
industry laid. He spent one year as Associate Dean of the School of
Natural
Sciences and Mathematics (1977-78). He was appointed Dean of the School
of
Natural Sciences and Mathematics in 1980. Following the establishment
of an
industrially oriented doctoral program in Chemistry in 1982, Dr.
Caldwell
resigned as Dean in 1984 to participate more directly in the
development of
that program and concentrate on his independent research. He has been
active in
University governance, having chaired the Committee on Educational
Policy
(1976-77) and the Committee on
Qualifications of Academic Personnel (1979-80) and served on two
Search
Committees for Academic Vice President
vacancies (1974, Chairman; 1992). He was elected Speaker of the
University Faculty for 1989-90 and reelected for 1990-91. This position
is the
highest elected office in the UT-Dallas Faculty and is similar to
Chairman of
the Faculty Senate at other Universities. He represented UT-Dallas on
the
Faculty Group Advisory to the University of Texas System
in 1989-92. He served a second term as
Dean in 1997-2003.
Research.- A physical organic
chemist
primarily studying photochemical mechanisms, he has centered his work
on
the observation of reactive
intermediates and determination of their chemical and physical
properties. He
is best known for establishing the involvement of exciplexes as
obligatory
intermediates in photochemical reactions (Accts. Chem. Res., 1980, 13,
45).
More recently his work has emphasized (1) transient spectroscopy and
theoretical studies of olefin triplets and triplet biradicals with the
goal of
understanding the factors which cause intersystem crossing; (2) studies
of
reactivity in singlet and triplet state photocycloadditions with the
goal of
understanding the fundamental origins of such photoreactivity; (3)
studies of
highly strained and therefore transient ground state species such as
trans-cyclohexenes and -heptenes.
The first mentioned project was supported by NSF from 1980-1999 (FY98
budget
$105,000 TC) and the second by the Robert A. Welch Foundation (FY00
budget
$45,000 TC). The third is supported in different aspects by each of the two. Time-resolved
photoacoustic calorimetry and transient-transient chemistry following
laser excitation
are promising recent ventures. Total C&G support for his research
since
1965 has been approximately $2,340,000, about 65% from NSF with most of
the
rest from the Welch Foundation. Dr. Caldwell spent 1996-7 at the
Frederick (Md.) Biomedical Supercomputing Center, NCI-SAIC to learn
computational biology and computational techniques for studying
solvent-solute
interactions. The last mentioned topics comprise his major current
research
efforts.
Professional
Service.- Dr. Caldwell was Chairman of the 1993
Gordon Conference on Organic Photochemistry. He has been Vice-President
(1992-1994) and President (1994-1996) of the Inter-American
Photochemical
Society and served on many of its committees. He
was a member (1980-5) and Chairman (1983-5) of the
Advisory Committee of the Center
for Fast Kinetics Research at The University of Texas at Austin. He has
served
on the Steering Committee of the U. S.-Japan Cooperative
Photoconversion and Photosynthesis
Program. He was Chairman of the XVII IUPAC Symposium on Photochemistry,
held in
Barcelona, Spain, in July 1998. He was the Osprey Lecturer at the
University of
Cincinnati in October 1999.
Honors. - He received the
1987 Wilfred
T. Doherty Award, sponsored by the Dallas-Fort Worth section of the
American Chemical
Society and given to a member annually to recognize contributions to
chemistry.
Publications
1.
"Metalation of Norbornadiene with Butyllithium", with A.
Streitwieser, Jr., J. Org. Chem.1962, 27, 3360.
2.
"Activation Parameters for Exchange of Toluene-a-D with Lithium
Cyclohexylamide in
Cyclohexylamine", with A.
Streitwieser, Jr., M. R. Granger, and P. M. Laughton, J.
Phys. Chem. 1964, 68, 2916.
3.
"Relative Stabilities of Triphenylmethyl and Bridgehead Triptycyl
Carbanions", with A. Streitwieser, Jr., and M. R. Granger,
J. Am. Chem. Soc. 1964, 86, 3578.
4.
"Kinetics and Mechanism of Exchange of Benzene and sec-Butylbenzene
with
Cesium Cyclohexylamide", with A.
Streitwieser, Jr., J. Am. Chem. Soc. 1965, 87, 5394.
5.
"Comparison of Relative Proton
Exchange Rates of Hydrocarbons with Lithium Cyclohexylamide and Cesium Cyclohexylamide", with A.
Streitwieser, Jr., R. G. Lawler, and G. R. Ziegler, J. Am. Chem.
Soc. 1965, 87, 5399.
6.
"Triplet States in Radiation Chemistry. Radiochemical Cis-trans-
Isomerization", with D. G. Whitten and G. S. Hammond,
J. Am. Chem. Soc. 1966, 88, 2659.
7.
"Secondary Deuterium Isotope Effects on the Transfer of Triplet
Electronic
Excitation to an Olefin", with G. Wayne Sovocool,
J. Am. Chem. Soc. 1968, 90, 7138.
8.
"Correlation between Photochemistry and High-Energy Radiation
Chemistry", with G. S. Hammond, John M. King, H. Kristinsson,
and D. G. Whitten, Photochem. Photobiol., 1968, 7, 695.
9.
"Photosensitized Fragmentation of a Bicyclo (4.2.0)-octa-2,4-diene
Derivative. Preparation of the Isomeric 1,2- Diacetoxyethylenes", J.
Org. Chem.,1969, 34, 1886.
10.
"The Cesium Cyclohexylamide Catalyzed Proton Exchange of Cyclohexane
with
Cyclohexylamine", with A. Streitweiser and
W. R. Young, J. Am. Chem. Soc. 1969, 91, 527.
11.
"Kinetic Acidities of Small Ring Cycloalkanes and Correlation with J(13C- H)", with A.
Streitwieser, Jr., and W. R. Young,
J. Am. Chem. Soc. 1969,
91,
529.
12.
"Quenching of Fluorenone Fluorescence by Triethylamine. Medium Effects
on
the Singlet Lifetime", Tetrahedron Lett.,
1969, 2121.
13.
"Norrish II Fragmentation of 3, 4-Diphenylbutyrophenone. Loss of Spin
Memory in a 1, 4-Biradical", with Peter M. Fink, Tetrahedron
Lett.,
1969,
2987.
14.
"Secondary Isotope Effects as Photochemical Mechanistic Criteria.
Photosensitized cis-trans Olefin Isomerization not
Involving the Olefin Triplet State", with Stephen P.
James, J. Am. Chem. Soc., 1969,
91,
5184.
15.
"Quantitative Deuteration of a Grignard Reagent. The Preparation of 2-
Butene-2-d", J. Org. Chem., 1970, 35, 1193.
16.
"Isotope and Substituent Effects on the Interaction of Benzophenone
Triplets with Simple Olefins. Apparent Insufficiency
of the Schenk Mechanism", J. Am. Chem. Soc., 1970, 92, 1439.
17.
"Isoprene Triplets as Excitation Donors. Non-vertical De-excitation",
J. Am. Chem. Soc.,
1970,
92,
3229.
18.
"The Fluorenone-sensitized Photoisomerization of trans-Stilbene.
Inefficiencies both in Intersystem Crossing and in
Triplet Excitation Transfer", with R. P. Gajewski, J.
Am. Chem. Soc.,
1971,
93,
532.
19.
"Secondary Deuterium Isotope Effects on Triplet Excitation Transfer.
Deuterium Position and Sensitizer Effects", with G.
W. Sovocool and R. J. Peresie, J.
Am. Chem. Soc.,
1971,
93,
779.
20.
"Quenching of Excited States by Stable Free Radicals. The Effect of
Di-t-
Butyl Nitroxide on Stilbene and Naphthalene Triplets",
with R. E. Schwerzel, J. Am. Chem. Soc., 1972, 94, 1035.
21.
"Quenching of Excited States by Stable Free Radicals. II. On the
Mechanism
of Triplet Quenching of Di-tert-butyl
Nitroxide", with Robert E. Schwerzel, J. Am. Chem. Soc., 1973, 95, 1382.
22.
"Secondary Deuterium Isotope Effects on the Transfer of Triplet
Excitation", with G. W. Sovocool and R. J. Peresie, J. Am. Chem. Soc., 1973, 95, 1496.
23.
"Intermediates and Stereochemistry in the Triplet-State
Photocycloaddition
of Phenanthrene to Electron-Poor Olefins", J. Am. Chem. Soc., 1973, 95, 1690.
24.
"The Primary Interaction Between Diaryl Ketone Triplets and Simple
Alkenes", with G. W. Sovocool and R. P. Gajewski, J.
Am. Chem. Soc., 1973, 95, 2549.
25.
"The Photocycloaddition of 9-Cyanophenanthrene to Substituted b-Methylstyrenes. An
Obligatory Exciplex
Intermediate", with L. Smith,
J. Am. Chem. Soc.,
1974,
96,
2994.
26.
"Role of a Singlet Exciplex in the Photocycloaddition of Phenanthrene
to
Dimethyl Fumarate", with D. Creed, J. Am. Chem. Soc., 1974, 96, 7369.
27.
"Exciplex Quenching. Geometric and Electronic Requirements", with D.
Creed and H. Ohta, J. Am. Chem. Soc., 1975,
97, 3246.
28.
"Thermodynamics of Exciplex Formation by Time-Resolved Nanosecond Flash
Spectroscopy", with D. Creed, Paul H. Wine,
and Lynn A. Melton, J. Am. Chem. Soc., 1976, 98, 621.
29.
"Exciplex Substitution (Sex). A New
Photophysical
Process", with H. Ohta, D. Creed, P. Wine, and L. A. Melton, J. Am.
Chem. Soc., 1976, 98, 2002.
30.
"Exciplex Quenching. A Frontier Molecular Orbital Rationale", with D.
Creed, H. Ohta, and D. DeMarco, J. Am. Chem. Soc., 1977, 99, 277.
31.
"The Delphi Project: A Study of Attitudes toward Undergraduate
Education
in Chemistry", with L. A. Melton, C. A. Parr, and
A. D. Sherry, J. Chem. Ed., 1977, 54, 640.
32.
"Electrochemical and Electrogenerated Chemiluminescence Studies of
Substituted
Olefin- Cyanophenanthrene Mixed
Systems", with Su-Moon Park, J. Electrochem. Soc., 1977, 124, 1859.
33.
"Interception of a Triplet
Biradical by Paramagnetic Species. Enhancement of a
Photocycloaddition",
with David Creed, J. Am. Chem.
Soc.,
1977,
99,
8360.
34.
"Photocycloaddition of b-Methylstyrenes
to Some 9-Cyanophenanthrenes. Chemical Consequences of Exciplex Formation", with Nabih I. Ghali,
C.-K. Chien, D. DeMarco, and Larry Smith, J. Am. Chem. Soc., 1978, 100, 2857.
35.
"Temperature and Substituent Dependence of Photocycloadditions
Involving
Exciplexes", with D. Creed, J. Am. Chem. Soc., 1978, 100, 2905.
36.
"Triplet Sensitization and Exciplex Quenching of the Photochemical
Reaction between Phenanthrene and Dimethyl Fumarate",
with D. Creed, and (in part) Mary McKenney
Ulrich, J. Am. Chem. Soc., 1978, 100, 5831.
37.
"The Effects of Oxygen and di-t-Butyl Nitroxide on the Photoreaction of
Phenanthrene with Dimethyl Fumarate", with D. Creed,
J. Phys. Chem., 1978, 82, 2644.
38.
"Polar Substituent Effects in
Triplet Quenching. Excitation Transfer and Cycloaddition", with D.
Creed
and T.-S. Maw, J. Am. Chem. Soc., 1979, 101, 1293.
39.
"An Olefin Triplet Lifetime Measurement by Electron Transfer
Interception", with C. Pac, Chem. Phys. Lett., 1979, 64,
303.
40.
"The Effect of Multiplicity on Regiochemistry of [2+2]
Photocycloaddition
of 3,9-Dicyanophenanthrene to trans-b-
Methylstyrene", with T.-S. Maw, J. Photochem., 1979, 11, 165.
41.
"Activation Parameters in the Photocycloaddition of Phenanthrene to
Dimethyl Fumarate", with D. Creed, J. Am. Chem. Soc., 1979, 101, 6960.
42.
"Charge Transfer Quenching of Singlet Excited Complexes", with D.
Creed, L. A. Melton, D. C. DeMarco, H. Ohta, and P.
H. Wine, J. Am. Chem. Soc., 1980, 102, 2369.
43.
"Exciplex Intermediates in [2+2] Photocycloadditions", with D. Creed,
Accts. Chem. Res.,
1980,
13,
45.
44.
"A Predictor of Reactivity in Allowed Photodimerizations and
Photocycloadditions", J. Am. Chem. Soc., 1980, 102, 4004.
45.
"Lifetimes of Some Styrene
Triplets in Fluid Solution. Triplet Geometries and the Effects of
Alkylation", with Chi Van
Cao, J. Am. Chem. Soc., 1981, 103, 3594.
46.
"Photochemistry of the Phenanthrene - Stilbene System. Cycloaddition
and
Singlet-Sensitized Isomerization", with K. Mizuno,
P. E. Hansen, L. P. Vo, M. Frentrup, and C. D. Ho, J.
Am. Chem. Soc.,
1981,
103,
7263.
47.
"Some Structural Effects on Triplet Biradical Lifetimes. Norrish II and
Paterno-Buchi Biradicals", with T. Majima and C. Pac,
J. Am. Chem. Soc., 1982, 104, 629.
48.
"Structural Effects on Twisted Olefin Triplet Lifetimes. Styrene
Derivatives", with C. V. Cao, J. Am. Chem. Soc., 1982,
104, 6174.
49.
"Lifetimes of Conjugated Diene Triplets", with M. Singh, J. Am.
Chem. Soc., 1982, 104, 6121.
50.
"Conformations and Competitive [2+2] Cycloadditions of Intramolecular
Exciplexes of Some Anisylalkenyl 9- Phenanthrenecarboxylates", with H.
Sakuragi, K. Tokumaru, H. Itoh, K. Terakawa, K. Kikuchi, and C-C. Hsu, J.
Am. Chem. Soc.,
1982,
104,
6796.
51.
"The Effect of Polar Substituent on Olefin Triplet Lifetime", with M.
Singh, J. Am. Chem. Soc., 1983,
105,
5139.
52.
"Direct Observation and Chemistry of l,6 Biradicals in the Norrish I
Reaction", with H. Sakuragi and T. Majima, J. Am. Chem. Soc., 1984, 106, 2471.
53.
"Intersystem Crossing in Organic Photochemical Intermediates", Pure
and Applied Chemistry,
1984,
56,
1167-1177.
54.
"The Lifetime of a Conformationally Constrained Norrish II Biradical.
Photochemistry of cis-1-Benzoyl-2- benzhydrylcyclohexane", with S. N.
Dhawan and T. Majima, J. Am. Chem. Soc., 1984, 106, 6454.
55.
"Photochemical Electron Transfer Reactions and Exciplexes", with D.
Creed, Photochem. Photobiol., 1985, 41, 715.
56.
"pH Dependence of the Lifetime of a Norrish II Biradical", with S. N.
Dhawan and D. E. Moore, J. Am. Chem. Soc., 1985,
107, 5163.
57.
"Direct Observation of a 1,3 Biradical", with K. Mizuno, N. Ichinose,
and Y. Otsuji, J. Am. Chem. Soc., 1985, 107, 5797.
58.
"Use of Pulsed Time-Resolved Photoacoustic Calorimetry to Determine the
Strain Energy of trans-1-Phenylcyclohexene and
the Energy of the Relaxed 1-Phenylcyclohexene
Triplet", with J. L. Goodman, K. S. Peters, and H. Misawa, J. Am.
Chem.
Soc.,
1986,
108,
6803.
59.
"Photochemistry of 4,4-Dimethyl-1-mesityl-2-pentyn-1-one", with W. C.
Agosta, J. Jay, L. J. Johnston, V. B. Rao, J. C. Scaiano,
M. Singh, and S. Wolff, J. Am. Chem. Soc., 1987, 109, 3050.
60.
"An Unusually Large Secondary Deuterium Isotope Effect. Thermal
trans-cis
Isomerization of trans-1- Phenylcyclohexene", with H. Misawa, E. F.
Healy,
and M. J. S. Dewar, J. Am. Chem. Soc., 1987, 109, 6869.
61.
"Viable Geometries for T1-S0
ISC in Alkene Triplets", with L. Carlacci, C. E. Doubleday, Jr., T. R.
Furlani, H. F. King, and J. W.
McIver, Jr., J. Am. Chem. Soc., 1988, 110, 6901.
62.
"The Relaxed and Spectroscopic Energies of Olefin Triplets," with Ni
Tuqiang and L. A. Melton, J. Am. Chem. Soc.,
1989, 111,
457-464.
63.
"Absence of Conformational Dependence of Norrish II Biradical
Lifetimes," with S. C. Gupta, J. Am. Chem. Soc., 1989, 111, 740-742.
64.
"Laser Flash Photolysis Studies of
Intersystem Crossing in Biradicals and Alkene Triplets;" in: Platz, M.,
Ed.; "Kinetics and
Spectroscopy of Carbenes and Biradicals; " Plenum Publishing: New York; 1990; pp 77-116.
(Invited).
65.
"Benzoquinone-Olefin Exciplexes: the Observation and Chemistry ot the
p-Benzoquinone-Tetraphenylallene Exciplex," with
K. R. Schnapp, R. M. Wilson, D. M. Ho, and D. Creed, J.
Am. Chem. Soc.,
1990,
112,
3700-3702.
66.
"Photochemical and Photophysical
Behavior of p-Methoxyphenylalkenyl Phenanthrenecarboxylates. 1.
Structure
and Competitive Formation of
Intramolecular Cycloaddition Products," with H. Sakuragi, K. Tokumaru,
H.
Itoh, K. Terakawa, K. Kikuchi, and
C. C. Hsu, Bull. Chem. Soc. Jpn., 1990, 63, 1049-1057.
67.
"Photochemical and Photophysical Behavior of p-Methoxyphenylalkenyl
Phenanthrenecarboxylates. 2. Kinetic
Investigation of Intramolecular Cycloaddition ," with H.
Sakuragi,
K. Tokumaru, H. Itoh, K. Terakawa, K. Kikuchi, and C.
C. Hsu, Bull. Chem. Soc. Jpn., 1990, 63, 1058-1061.
68.
"Determination of Triplet Excitation Energies of Cyclic Enones by
Time-Resolved Photoacoustic Calorimetry," with D. I.
Schuster, G. E. Heibel, and Wei Tang, Photochem.
Photobiol., 1990, 52, 645-648.
69.
"Photoacoustic Calorimetry of Cycloheptene Derivatives. Relaxed Triplet
Energies of 1-Phenylcycloheptene and 1,3- Cycloheptadiene and the
Energetics of
Ground-State cis-trans Isomerisation," with
Colin M. Brennan, Photochem. Photobiol.,
1991, 53,
165-170.
70.
"Nanosecond Kinetic Absorption and Calorimetric Studies of
Cyclopentenone:
the Triplet, Self-Quenching, and the Predimerization
Biradicals," with Wei Tang, D. I.
Schuster, and G. E. Heibel, Photochem.
Photobiol., 1991, 53, 159-164.
71.
"Conformationally Dependent Heavy
Atom Effect of Chlorine on Alkene Triplet Lifetimes. Experiment and Ab
Initio Calculations", with L.
D. Jacobs, T. R. Furlani, E. A. Nalley, and J. Laboy, J. Am. Chem.
Soc.,
1992,
114,
1623-1625.
72.
"The Heat of Formation of the Benzophenone Ketyl Radical by
Time-Resolved
Photoacoustic Calorimetry," with L. G. Arnaut,
J. Photochem.
Photobiol. A., 1992, 65, 15-20.
73.
"Relaxed Triplet Energies of
Phenylnorbornenes. The Role of Phenyl-Vinyl Torsions. On the Origin of
Nonvertical Excitation
Transfer," with S. J. Riley, A. A. Gorman, and D. J. Unett, J. Am.
Chem. Soc., 1992, 114, 4224-4226.
74.
"Recent Advances in Photoacoustic Calorimetry: Improvements in
Experimental Design," with L. G. Arnaut, J. E. Elbert,
and L. A. Melton, Rev. Sci. Instrum., 1992, 63, 5381-5389.
75.
"Stereospecific Photocycloaddition of Electron-Deficient Arylalkenes to
9-Cyanophenanthrene via an Exciplex," with K. Mizuno,
A. Tachibana. and Y. Otsuji, Tetrahedron Lett., 1992, 33, 5779-5782.
76.
"Potential Energy Surfaces of a one-way isomerizing olefin studied by
photoacoustic calorimetry and X-ray
crystallography," with T. Arai, H. Okamoto, K. Tokumaru, T. Ni,
and
K. Ueno, J. Photochem.
Photobiol. A: Chem.,
1993, 75, 85-90.
77.
"Thermochemistry of Strained Cycloalkenes: Experimental and
Computational
Studies," with A. D. Strickland, J. Phys. Chem., 1993, 97, 13394-13402.
78.
"Are Perpendicular Alkene Triplets Just 1,2-Biradicals?
Studies with the Cyclopropylcarbinyl
Clock," with Lingwen
Zhou. J. Am. Chem. Soc., 1994, 116, 2271-2275.
79.
"Nonvertical Triplet Excitation Transfer to Arylalkene Acceptors: Further Evidence That Double Bond
Torsion is Unimportant,"
with C. M. Brennan, J. E. Elbert, and
D. J. Unett, J. Am. Chem. Soc., 1994, 116, 3460-3464.
80.
"Alkane Triplets as 1,2-Biradicals:
The Photoaddition of p-Acetylstyrene to Styrene,"
with J. Felipe Diaz, Duane C.
Hrncir, and David J. Unett, J. Am.
Chem. Soc., 1994, 116, 8138-8145.
81.
"Singlet State Cis,Trans Photoisomerization and Intersystem Crossing of
1-Arylpropenes," with
Frederick D. Lewis, Dario M.
Bassani, and David J. Unett, J.
Am. Chem. Soc.,
1994,
116,
10477-10485.
82.
"Triplet Species from Norbornadiene.
Time Resolved Photoacoustic Calorimetry and ab initio Studies of
Energy, Geometry, and Spin - Orbit
Coupling," with Anna M.
Helms, J. Am. Chem. Soc., 1995,
117,
358-361.
83.
"The Triplet State of Alkenes:
Structure, Dynamics, Energetics and Chemistry,"
with D. J. Unett, Res. Chem. Intermed., 1995,
21,
665-709.
84.
"Photodimerization of
1-Phenylcyclohexene. A Novel
Transient - Transient Component,"
with David J. Unett and
Duane C. Hrncir, J. Am. Chem. Soc.,1996, 118, 1682-1689.
85.
"Photocycloaddition of 4,4-Dimethylcyclohexenone to
1,1-Diphenylethylene. Evidence for a
Triplet Exciplex
Intermediate," with Duane C. Hrncir, T. Mu–oz, and David J. Unett, J.
Am. Chem. Soc.,
1996,
118,
8741-8742.
86.
"Triplet Energy and Lifetime of 2,3-Diazabicyclo[2.2.2]oct-1-ene,"
with Anna M. Helms, Paul S. Engel, and A. Wu, J. Phys. Chem., 1996, 100, 17716-17717.
87.
"Time-Resolved Photoacoustic Calorimetry of Tri- and
Tetraphenylethylenes.
Do S0 and T1 Energy Surfaces
Cross?"
with D. J. Unett and J. J. Vipond, Photochem. Photobiol., 1997, 65, 530-534.
88.
"Enthalpies of Hydrogenation and of Formation of
1-Phenylcycloalkenes," with Joel F. Liebman, Donald W. Rodgers, and
David
J. Unett, Journal of Molecular Structure, 1997, 413-414, 575-578.
89.
ÒSite Selectivity in [2+2]Photocycloadditions of 2H, 8H-Benzo[1,2-b:3,4-bÕ]dipyran-2,8-dione
to Alkenes,Ó with J. Bethke, P. Margaretha, and A. M. Wynne, Journal of Chemical Research(S), 1998,
142-3.
90.
"Photochemical C-C Bond
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