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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

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
197
Identifiers
DOI: 10.1016/0009-2614(92)85800-p

Abstract

Abstract The anisotropy of the triplet sublevel populating rates was determined for 1,10-phenanthroline (phen), 2,9-dimethyl—1,10-phenanthroline (2,9-Me 2phen) and their zinc(II) complexes in rigid solutions and for ZnCl 2(2,9-Me 2phen) in the crystalline state at 77 K by a time-resolved EPR technique. The sublevel initially populated by intersystem crossing (ISC) is T y in phen, 2,9-Me 2phen, Zn-phen-(NO 3) 2, Zn-phen-(ClO 4) 2 and Zn-2,9-Me 2phen-(ClO 4) 2, while it is mainly T x in Zn-2,9-Me 2phen-Cl 2 (the y 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-Me 2phen.

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