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Chain Length Modulated Dimerization and Cyclization of Terminal Thienyl-Blocked Oligopyrranes
Yixing He1, Bin Zhu1, Qizhao Li1
1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry & Molecular Engineering, State Key Laboratory of Bioreactor Engineering, Laboratory of Pharmaceutical Crystal Engineering & Technology, School of Pharmacy, East China University of Science & Technology, Shanghai, 200237, China.
Abstract:
Oxidation of thienyl-blocked bilane and pentapyrrane afforded chain length dependent products of the symmetric dimer D1 and the thienyloligopyrrin-appended pentaphyrin analogue P2, respectively, with the latter formed by simultaneous dimerization and cyclization. Coordination of D1 and P2 with Cu(II) afforded di- and monometallic complexes D1-Cu2 and P2-Cu, respectively. These compounds exhibit distinct NIR absorption, with the absorption tail of D1-Cu2 extended to ca. 1900 nm despite its smaller conjugation framework than that of P2-Cu.
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