Volume 58, Issue 8 pp. 2272-2277
Communication

Boron(III) Carbazosubphthalocyanines: Core-Expanded Antiaromatic Boron(III) Subphthalocyanine Analogues

Joseph Y. M. Chan

Joseph Y. M. Chan

Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China

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Takahiro Kawata

Takahiro Kawata

Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, Ueda, 386-8567 Japan

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Prof. Nagao Kobayashi

Corresponding Author

Prof. Nagao Kobayashi

Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, Ueda, 386-8567 Japan

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Prof. Dennis K. P. Ng

Corresponding Author

Prof. Dennis K. P. Ng

Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China

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First published: 02 January 2019
Citations: 13

Graphical Abstract

Core competencies: A series of novel core-expanded boron(III) subphthalocyanine analogues, namely boron(III) carbazosubphthalocyanines, have been synthesized and characterized. They represent the first examples of antiaromatic boron(III) subphthalocyanine derivatives and the smallest antiaromatic azaporphyrinoids reported thus far.

Abstract

Condensation of 1,8-diamino-3,6-dichlorocarbazole with a series of disubstituted 1,3-diiminoisoindolines, followed by treatment with BF3⋅OEt2 led to the formation of the corresponding core-expanded boron(III) subphthalocyanine analogues. These air-stable π-conjugated boron(III) carbazosubphthalocyanines possess two boron-containing seven-membered-ring units and a 16 π-electron skeleton, and represent the first examples of antiaromatic boron(III) subphthalocyanine analogues as supported by spectroscopic and theoretical studies. The molecular structure of one of these compounds was unambiguously determined by single-crystal X-ray diffraction analysis. In contrast to typical boron(III) subphthalocyanines, which adopt a cone-shaped structure, the π skeleton of this compound is almost planar.

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