Walter H. Waddell
Columbia University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Walter H. Waddell.
Photochemistry and Photobiology | 1977
Margaret W. Geiger; Nicholas J. Turro; Walter H. Waddell
Abstract— The spectroscopy and photochemistry of brilliant green leucocyanide 1a were investigated at room and low temperature, in polar and nonpolar solvents. At 77 K, 1a exhibits solvent independent absorption, fluorescence (φf= 0.1), and phosphorescence (φp= 0.5). Solvent effects become important at room temperature; in polar solvents, φf, decreases and photodissociation yielding brilliant green dye 3 occurs [φdis,(EtOH) ˜0.91. Dye formation and 1a fluorescence can be quenched by 0.1 M crotononitrile. Attempts to sensitize dye formation with triplet sensitizers were unsuccessful. The spectroscopy of 3 was also examined.
Zeitschrift für Physikalische Chemie | 1976
Peter Lechtken; Ahmad Yekta; Neil E. Shore; Hans C. Steinmetzer; Walter H. Waddell; Nicholas J. Turro
man Triplett-Löscher aus dem System aus, so greift 3A das Substrat 1 an unter Rückbildung von 3A mit einer Effizienz < 1,0. Diese selbstsensibilisierte Zersetzung läuft nach einem Quantenkettenmechanismus ab. Die Kettenlänge n, Effizienz und Quantenausbeute wird bestimmt durch Untersuchung der Kinetik der Thermolyse, der Quantenausbeute der Photolyse, der Intensität der Phosphoreszenz und der Energieübertragung auf Triplett-Löscher.
Journal of the American Chemical Society | 1976
Walter H. Waddell; Rosalie Crouch; Koji Nakanishi; Nicholas J. Turro
Journal of the American Chemical Society | 1974
Arnold M. Schaffer; Walter H. Waddell; Ralph S. Becker
Journal of the American Chemical Society | 1977
Walter H. Waddell; Daniel L. Hopkins
Journal of the American Chemical Society | 1973
Walter H. Waddell; Arnold M. Schaffer; Ralph S. Becker
The Journal of Physical Chemistry | 1976
Ralph S. Becker; Gordon L. Hug; P. K. Das; Arnold M. Schaffer; Takeshi Takemura; Naoto Yamamoto; Walter H. Waddell
Journal of the American Chemical Society | 1981
Walter H. Waddell; Kohji Chihara
Journal of the American Chemical Society | 1975
Carl A. Renner; Thomas J. Katz; Joseph Pouliquen; Nicholas J. Turro; Walter H. Waddell
Journal of the American Chemical Society | 1976
Nicholas J. Turro; Carl A. Renner; Walter H. Waddell; Thomas J. Katz