title: The Role of Substituent Effects in Tuning Metallophilic Interactions and Emission Energy of Bis-4-(2-pyridyl)-1,2,3-triazolatoplatinum(II) Complexes.
abstract: The photoluminescence spectra of a series of 5-substituted pyridyl-1,2,3-triazolato Pt(II) homoleptic complexes show weak emission tunability (ranging from λ=397-408 nm) in dilute (10(-6) M) ethanolic solutions at the monomer level and strong tunability in concentrated solutions (10(-4) M) and thin films (ranging from λ=487-625 nm) from dimeric excited states (excimers). The results of density functional calculations (PBE0) attribute this "turn-on" sensitivity and intensity in the excimer to strong Pt-Pt metallophilic interactions and a change in the excited-state character from singlet metal-to-ligand charge transfer ((1)MLCT) to singlet metal-metal-to-ligand charge transfer ((1)MMLCT) emissions in agreement with lifetime measurements.
authors.affiliation: University of Surrey, Advanced Technology Institute, Guildford, GU2 7XH (UK).
authors.forename: M R Ranga
authors.initials: MR
authors.lastname: Prabhath
authors.affiliation: University of Surrey, Advanced Technology Institute, Guildford, GU2 7XH (UK).
authors.forename: Julia
authors.initials: J
authors.lastname: Romanova
authors.affiliation: University of Surrey, Advanced Technology Institute, Guildford, GU2 7XH (UK).
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Curry
authors.affiliation: University of Surrey, Advanced Technology Institute, Guildford, GU2 7XH (UK).
authors.forename: S Ravi P
authors.initials: SR
authors.lastname: Silva
authors.affiliation: University of Surrey, Advanced Technology Institute, Guildford, GU2 7XH (UK). p.d.jarowski@surrey.ac.uk.
authors.forename: Peter D
authors.initials: PD
authors.lastname: Jarowski
keywords: charge transfer; density functional calculations; photoluminescence; platinum; stacking interactions