標題: Zeeman studies of the first excited states of palladium and metal free phthalocyanines in Shpol'skii matrix
作者: Huang, SC
Chen, WH
交大名義發表
電子物理學系
National Chiao Tung University
Department of Electrophysics
公開日期: 1-Jun-1996
摘要: Phthalocyanines (Pcs) are planar molecules of relatively high symmetry and exhibit magneto-optic effects in many ways. We report the Zeeman effect of the first excited states of palladium (Pd-) and free-base (H-2-) Pcs in a 5 K Shpol'skii matrix by direct observation of their fluorescence position shifts. From the experimental data an apparent angular momentum integral, coupling the lowest two Jahn-Teller stabilized crystal field split first excited states, Lambda', was found to be 2.7+/-0.1 (h) over bar for PdPc. No conclusive Lambda' was deduced for H(2)Pc but its value can be estimated to be around the theoretical value of 3 (h) over bar. The experimental data of H(2)Pc revealed a complex structure in the fluorescence band examined, which complicated the analysis of Lambda' but helped unravel the biexponential decay problem of the structure. We infer one narrower band in the structure has the previously reported lifetime of tau 6.3 ns, and the other broader band being similar to 1.8 cm(-1) higher, has tau 3.7 ns. We believe this composite situation also exists for the other tautomeric structure since it also exhibited biexponential decay. (C) 1996 American Institute of Physics.
URI: http://hdl.handle.net/11536/1262
ISSN: 0021-9606
期刊: JOURNAL OF CHEMICAL PHYSICS
Volume: 104
Issue: 21
起始頁: 8210
結束頁: 8215
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