Visible light-harvesting trans bis(alkylphosphine) platinum(II)-alkynyl complexes showing long-lived triplet excited states as triplet photosensitizers for triplet-triplet annihilation upconversion

被引：40

作者：

Liu, Lianlian ^{[1
]}

Huang, Dandan ^{[1
]}

Draper, Sylvia M. ^{[2
]}

Yi, Xiuyu ^{[1
]}

Wu, Wanhua ^{[1
]}

Zhao, Jianzhang ^{[1
]}

机构：

[1] Dalian Univ Technol, State Key Lab Fine Chem, Sch Chem Engn, Dalian 116012, Peoples R China

[2] Univ Dublin, Sch Chem, Trinity Coll, Dublin 2, Ireland

来源：

DALTON TRANSACTIONS | 2013年 / 42卷 / 30期

基金：

爱尔兰科学基金会;

关键词：

DIIMINE BIS(ACETYLIDE) COMPLEXES; CYCLOMETALATED IR(III) COMPLEXES; PT(II) BISACETYLIDE COMPLEXES; PLATINUM-ACETYLIDE OLIGOMERS; SILICON SOLAR-CELLS; LOW-POWER; PHOTOPHYSICAL PROPERTIES; TERPYRIDINE COMPLEXES; STRONG ABSORPTION; PHOSPHORESCENCE;

D O I：

10.1039/c3dt50496d

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Symmetric and asymmetric linear trans-bis(tributylphosphine) Pt(II) bis(acetylide) complexes with functionalized aryl alkynyl ligands (coumarin, naphthalimide and phenyl acetylides) were prepared, which show enhanced absorption in the visible region (molar absorption coefficients up to 76 800 M-1 cm(-1) at 459 nm) and long-lived triplet excited states (up to 139.9 mu s). At room temperature, the naphthalimide acetylide-phenyl acetylide complex (Pt-4) shows dual emission (fluorescence-phosphorescence), whereas other complexes show only fluorescence emission. The triplet excited states of the complexes were studied with nanosecond time-resolved transient difference absorption spectroscopy and DFT calculations on the spin density surface. The complexes were used as triplet photosensitizers for ratiometric O-2 sensing, as well as triplet-triplet annihilation (TTA) upconversion (upconversion quantum yield up to 27.2%). The TTA upconversion of the complexes requires triplet acceptors with different T-1 state energy levels and was studied with nanosecond time-resolved emission spectroscopy. Our results are useful for designing new Pt(II) complexes that show strong absorption of visible light and long-lived triplet excited states, as well as for the application of these complexes as triplet photosensitizers for O-2 sensing, photocatalysis and TTA upconversion.

引用

页码：10694 / 10706

页数：13

共 43 条

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