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Effects of counterion on the triplet states of zinc(II) complexes with 1,10-phenanthroline and 2,9-dimethyl-1,10-phenanthroline

✍ Scribed by Mikio Yagi; Takashi Kaneshima; Masafumi Torii; Keisuke Matsuo; Jiro Higuchi

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
340 KB
Volume
197
Category
Article
ISSN
0009-2614

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✦ Synopsis

The anisotropy of the triplet sublevel populating rates was determined for 1 , 1 0-phenanthroline ( phen), 2,9dimethyl-1,l Ophenanthroline (2,9-Me2phen) and their zinc(H) complexes in rigid solutions and for ZnClz(2,9-Merphen) in the crystalline state at 77 K by a time-resolved EPR technique. The sublevel initially populated by intersystem crossing (ISC) is T,, in phen, 2,9-Merphen, Zn-phen-(N03)r, Zn-phen-(ClO,)z and Zn-2,9-Mezphen-(Clod),, while it is mainly TX in Zn-2,9-Mezphen-Cl2 (they axis is parallel to the long in-plane molecular axis and x is perpendicular to the molecular plane). The counterion plays an important role in determining the anisotropy in the ISC of the zinc( II) complex with 2,9-Mezphen.

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