Articles written in Journal of Chemical Sciences
Volume 104 Issue 2 April 1992 pp 241-249
Spectroscopic and ODMR investigations of the lowest ππ* and ligand-ligand charge-transfer excited states of zinc(II) mixed-ligand complexes
Kaoru Nozaki Shigeru Ikeda Seiichi Yamamoto Takeshi Ikeyama Tohru Azumi J A Burt G A Crosby
Zero-field splittings of the emitting levels of the title compounds were measured by ODMR. For complexes of the type Zn(X-PhS)2(phen) resonances of the3ππ* phosphorescing levels were observed for X=F5, 4-Cl, 4-CH3. For X=4-Cl, resonances were detected for the3LLCT emitting manifold also. For X=4-CH3O, resonances were detected only for the3LLCT emitting states. A model invoking mixing between the two types of states is proposed that satisfactorily accounts for the dependences of the properties of the emitting manifolds on the donating ability of the X substituent.
Volume 105 Issue 6 October 1993 pp 629-636
Electron-nuclear cross-relaxation effect on the photochemical reaction of benzaldehyde as studied by CIDNP and DNP
Yuzuru Yamakage Qing-Xiang Meng Sameh Saad Ali Kiminori Maeda Tohru Azumi
The magnetic field dependence of CIDNP was measured for the photolysis of benzaldehyde. At high and low fields, respectively, the CIDNP behavior is satisfactorily interpreted by the
The DNP sign shows that the cross-relaxation mechanism of the intermediate free radical is δm
Further, the time-resolved DNP is observed with laser excitation and switching of microwaves. With pulse excitation, the features of CIDNP and DNP are different from that with continuous light excitation. This is interpreted as due to the associated increase of the initial concentration of the ketyl radical. From the time dependence of the DNP intensity, the lifetime of the ketyl radical is estimated to be of the order of hundreds of nanoseconds.
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