Effect of peripheral fused ring substitution on the optical spectroscopy and electronic structure of metal phthalocyanine complexes

Wadzanai Chidawanyika, John MacK, Soji Shimizu, Nagao Kobayashi, Tebello Nyokong

研究成果: ジャーナルへの寄稿記事

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In this paper the impact of peripheral substitution with a strongly withdrawing fused ring group on the optical spectroscopy of a metal phthalocyanine complex is analyzed. We report the synthesis of [9 (or 10), 16 (or 17), 23 (or 24)-tri-tert-butylimidophthalocyaninato]zinc(II) (ZnttbIPc), which should eventually prove to be a useful precursor for forming dimeric compounds. The electronic structure is analyzed through a detailed analysis of the UV-visible absorption and magnetic circular dichroism spectra and time-dependent density functional theory calculations. Other than a marked splitting of the Q band, the spectrum is broadly similar to that of ZnPc in terms of the main π → π* electronic bands. The vibrational bands differ markedly in the Q band region when an imido group is added to ligand periphery, relative to what is observed in the case of zinc mononaphthotribenzotetraazaporphyrin (Zn3B1N) with an additional fused benzene ring. The absorption and emission spectra lack mirror symmetry as is the case with ZnPc and thus provide possible evidence for a second set of electronic origins in the Q band region arising from n → π* rather then π → π* transitions.

元の言語英語
ページ(範囲)1053-1062
ページ数10
ジャーナルJournal of Porphyrins and Phthalocyanines
13
発行部数10
DOI
出版物ステータス出版済み - 10 2009
外部発表Yes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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