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Photophysical Properties of Visible‐Light‐Harvesting Pt II Bis(acetylide) Complexes
Author(s) -
Yang Wenbo,
Zhao Jianzhang
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600968
Subject(s) - acetylide , excited state , chemistry , chromophore , photochemistry , photon upconversion , triplet state , singlet state , absorption (acoustics) , singlet fission , atomic physics , ion , optics , physics , organic chemistry
Pt II complexes have attracted much attention due to their readily derivatizable molecular structures and efficient production of triplet excited states and have been extensively used in many areas. Conventional Pt II complexes usually exhibit small molar absorption coefficients in the visible spectral region, and the triplet excited state lifetimes are short. However, for applications such as photocatalysis, triplet–triplet annihilation (TTA) upconversion, nonlinear optics, etc., visible‐light‐harvesting Pt II bis(acetylide) complexes with long‐lived triplet excited state are cucial. We summarize strategies directed towards achieving these goals, through the attachment of appropriate strong visible‐light‐harvesting organic chromophores to the ligand to switch the S 0 → 1 MLCT (metal‐to‐ligand charge transfer) transition to the S 0 → 1 IL (intraligand) transition (π–π*) and to switch the lowest triplet excited state from the 3 MLCT to the 3 IL state. We also summarize the properties of Pt II bis(acetylide) complexes that show broadband absorption and reverse saturate absorption for application in nonlinear optics. Singlet and triplet energy transfer and localization of the triplet excited state in multiple‐chromophore complexes are also discussed.