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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 12
BKCSDE 32(12)
December 20, 2011 

 
Title
Zinc Porphyrin-Cored Dendrimers; Axial Coordination of Pyridine and Photoinduced Electron Transfer to Methyl Viologen
Author
Ji Eun Park, Daeock Choi, Eun Ju Shin *
Keywords
Arylether dendrimer, Zinc porphyrin, Axial coordination, Pyridine, Methyl viologen
Abstract
The porphyrin-incorporated arylether dendrimers ZnP-D1 and ZnP-D4 were investigated to discover the influence of dendritic environments for the axial ligation of pyridine and photoinduced electron transfer by methyl viologen. Absorption and fluorescence spectra of ZnP, ZnP-D1, and ZnP-D4 were measured in dichloromethane with the addition of pyridine or methyl viologen dichloride. Axial ligation of pyridine was confirmed by red-shifted absorption spectrum. The complex formation constants Kf (Table 1) for axial coordination of pyridine on ZnP, ZnP-D1, and ZnP-D4 were estimated to be 4.4 × 103 M−1, 3.3 × 103 M−1, and 1.7 × 103 M−1, respectively. The photoinduced electron transfer to methyl viologen dichloride was confirmed by fluorescence quenching. Stern-Volmer constants Ksv for ZnP, ZnP-D1, and ZnP-D4 were calculated to be 2.6 × 103, 2.5 × 103, and 2.1 × 103, respectively. ZnP-D4 surrounded by 4 aryl ether dendrons shows the smallest Kf and Ksv values, with comparison to ZnP and ZnP-D1.
Page
4247 - 4252
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