A fluorescent bis(benzoxazole) ligand: toward binuclear Zn(II)-Zn(II) assembly.
Dalton Trans
; 39(22): 5254-9, 2010 Jun 14.
Article
em En
| MEDLINE
| ID: mdl-20440438
ABSTRACT
A bis(benzoxazole) ligand (HL) has been synthesized, and its reaction with Zn(OAc)(2) has led to fluorescent complexes via formation of binuclear Zn(II)-Zn(II) cores. The ligand-to-metal ratio of the complexes varies from 1 1 to 2 1, depending on the reaction conditions. A large binding constant K = 8.3 x 10(20) [M(-3)] has been determined for the reaction L + Zn(2+)-->L(2)Zn(2)(2+). The result indicates that the bis(benzoxazole) ligand is a useful building block to construct a binuclear core. On the basis of X-ray analysis, the binuclear Zn(II)-Zn(II) distance in the complexes is determined to be approximately 3.22 A, which is quite comparable to that found in the enzymes (3.3 A). Absorption and fluorescence study shows that a subtle chemical environmental change within the binuclear core can induce a large optical response.
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MEDLINE
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En
Ano de publicação:
2010
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Article