Stereoisomers of Homoleptic Dipyrrinatoplatinum(II) Complexes Having Arylborane Charge-transfer Substituents: Synthesis, Characterization and Spectroscopic Properties

Novel homoleptic arylborane–dipyrrinatoplatinum(II) complex [Pt(B-ph-dipy)2] (B-ph-dipy = 5-{4-(dimesitylboryl)phenyl}dipyrrinate) was designed and synthesized. Two stereoisomers of [Pt(B-ph-dipy)2] based on the coordination geometry (i.e., square-planar (1) and distorted tetrahedral (1′)) were obta...

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Bibliographic Details
Published in:Chemistry letters 2020-08, Vol.49 (8), p.905-908
Main Authors: Takaki, Koyo, Sakuda, Eri, Ito, Akitaka, Horiuchi, Shinnosuke, Arikawa, Yasuhiro, Umakoshi, Keisuke
Format: Article
Language:English
Subjects:
Aromatic compounds
Charge transfer
Emission spectra
Platinum
Spectral emittance
Stereoisomerism
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Summary:Novel homoleptic arylborane–dipyrrinatoplatinum(II) complex [Pt(B-ph-dipy)2] (B-ph-dipy = 5-{4-(dimesitylboryl)phenyl}dipyrrinate) was designed and synthesized. Two stereoisomers of [Pt(B-ph-dipy)2] based on the coordination geometry (i.e., square-planar (1) and distorted tetrahedral (1′)) were obtained and characterized. The complexes 1 and 1′ showed more intense absorption than a reference complex without any arylborane substituents [Pt(ph-dipy)2] (2) (ph-dipy = 5-phenyldipyrrinate) in the >300 nm region. Furthermore, the emission spectrum of 1′ was broad and structureless compared to the structured emission spectra of 1 and 2. The emitting excited state of 1′ is ascribed to a mixed charge transfer of MLCT in the distorted tetrahedral bis(dipyrrinato)platinum(II) moiety and π(aryl)–p(B) CT in the arylborane moieties.
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.200258