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Arylated versus Cyclometalated Platinum(II) Polypyridines: Photoluminescence from Pt(4'-R-trpy)Ph(+) Systems (R = NMe(2), N-Pyrrolidinyl, or 1-Pyrenyl).
MedLine Citation:
PMID:  23036100     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Many platinum(II) polypyridine complexes are good luminophores, an enigmatic exception being Pt(trpy)Ph(+), where trpy denotes 2,2':6',2″-terpyridine. A new analysis suggests the complex is nonemissive due to (3)SBLCT (sigma-bond-to-ligand charge transfer) character in the lowest energy excited state. Bases for two distinct strategies for inducing emission from aryl derivatives become clear. The standard approach of incorporating a phenyl group into a (N(/\)N(/\)C) cyclometalating ligand relies in part on the rigidity of the ligand framework. An alternative strategy, which involves expanding the chromophore and altering the orbital parentage of the emitting state, is capable of suppressing radiationless decay even further. Indeed, the Pt(4'-pyren-1-yl-trpy)Ph(+) system emits from a low-lying (3)π-π*(pyrene) excited state that has a lifetime of 45 μs in fluid solution.
Authors:
Daniel P Lazzaro; Phillip E Fanwick; David R McMillin
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-4
Journal Detail:
Title:  Inorganic chemistry     Volume:  -     ISSN:  1520-510X     ISO Abbreviation:  Inorg Chem     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0366543     Medline TA:  Inorg Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, Indiana 47907-2084, United States.
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