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The Role of Substituent Effects in Tuning Metallophilic Interactions and Emission Energy of Bis-4-(2-pyridyl)-1,2,3-triazolatoplatinum(II) Complexes

Prabhath, MRR, Romanova, J, Curry, Richard, Silva, S and Jarowski, PD (2015) The Role of Substituent Effects in Tuning Metallophilic Interactions and Emission Energy of Bis-4-(2-pyridyl)-1,2,3-triazolatoplatinum(II) Complexes Angewandte Chemie - International Edition, 54 (27). pp. 7949-7953.

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Abstract

The photoluminescence spectra of a series of 5-substituted pyridyl-1,2,3-triazolato PtII 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 (1MLCT) to singlet metal-metal-to-ligand charge transfer (1MMLCT) emissions in agreement with lifetime measurements. Turn-on tunability: A series of bis-4-(2-pyridyl)-1,2,3-triazolatoplatinum(II) complexes display variable emission tunability. At low concentration, the emission can be tuned only slightly by changing the nature of the substituent but at higher concentrations tunability is enhanced. This "turn-on" sensitivity in the excimeric emission is attributed to strong Pt-Pt metallophilic interactions and a change in the excited-state character.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Prabhath, MRR
Romanova, J
Curry, RichardR.J.Curry@surrey.ac.uk
Silva, SS.Silva@surrey.ac.uk
Jarowski, PD
Date : 1 June 2015
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1002/anie.201502390
Copyright Disclaimer : © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Depositing User : Symplectic Elements
Date Deposited : 22 Jun 2018 09:12
Last Modified : 11 Dec 2018 11:22
URI: http://epubs.surrey.ac.uk/id/eprint/810022

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