Wai Han Lam;Elizabeth Suk Hang Lam;咏华 任
The University of Hong Kong;China Association for Science and Technology
发表时间:2013
期 刊:Journal of the American Chemical Society
语 言:English
U R L: http://www.scopus.com/inward/record.url?scp=84885658005&partnerID=8YFLogxK
Platinum(II) alkynyl complexes of various tridentate pincer ligands, [Pt(trpy)(Cî -CR)]+ (trpy = 2,2′:6′,2″- terpyridine), [Pt(R′-bzimpy)(Cî -CR)]+ (R′-bzimpy = 2,6-bis(N-alkylbenzimidazol-2′-yl)pyridine and R′ = alkyl), [Pt(R′-bzimb)(Cî -CR)] (R′-bzimb = 1,3-bis(N- alkylbenzimidazol-2′-yl)benzene and R′ = C4H 9), have been found to possess rich photophysical properties. The emission in dilute solutions of [Pt(trpy)(Cî -CR)]+ originated from a triplet alkynyl-to-tridentate pincer ligand-to-ligand charge transfer (LLCT) excited state, with mixing of a platinum-to-tridentate pincer ligand metal-to-ligand charge transfer (MLCT) excited state, while that of [Pt(R′-bzimb)(Cî -CR)] originated from a triplet excited state of intraligand (IL) character of the tridentate ligand mixed with a platinum-to-tridentate ligand MLCT character. Interestingly, both emissions were observed in [Pt(R′-bzimpy)(Cî -CR)]+ in some cases. In addition, [Pt(R′-bzimb)(Cî -CR)] displayed a photoluminescence quantum yield higher than that of [Pt(R′-bzimpy)(Cî -CR)] +. Computational studies have been performed on the representative complexes [Pt(trpy)(Cî -CPh)]+ (1), [Pt(R′-bzimpy) (Cî -CPh)]+ (2), and [Pt(R′-bzimb)(Cî -CPh)] (3), where R′ = CH3 and Ph = C6H5, to provide an in-depth understanding of the nature of their emissive origin as well as the radiative and nonradiative processes. In particular, the factors governing the ordering of the triplet excited states and radiative decay rate constants of the emissive state (3ES) have been examined. The potential energy profiles for the deactivation process from the 3ES via triplet metal-centered (3MC) states have also been explored. This work reveals for the first time the potential energy profiles for the thermal deactivation pathway of square planar platinum(II) complexes.
化合物
工程与材料科学
医学与生命科学
Scopus度量
年份 | CiteScore | SJR | SNIP |
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1996 | |||
1997 | |||
1998 | |||
1999 | 3.438 | 2.106 | |
2000 | 3.589 | 2.141 | |
2001 | 3.506 | 2.112 | |
2002 | 3.587 | 2.324 | |
2003 | 3.421 | 2.223 | |
2004 | 3.841 | 2.187 | |
2005 | 4.413 | 2.205 | |
2006 | 4.662 | 2.229 | |
2007 | 5.202 | 2.134 | |
2008 | 5.06 | 2.121 | |
2009 | 4.958 | 2.199 | |
2010 | 5.167 | 2.14 | |
2011 | 16.1 | 5.478 | 2.326 |
2012 | 17.4 | 6.211 | 2.373 |
2013 | 19.3 | 5.993 | 2.446 |
2014 | 20.9 | 6.294 | 2.568 |
2015 | 22.4 | 6.775 | 2.602 |
2016 | 23.5 | 7.492 | 2.608 |
2017 | 24 | 8.127 | 2.634 |
2018 | 24.4 | 7.468 | 2.652 |
2019 | 24.8 | 6.976 | 2.682 |
2020 | 22.7 |
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