Issue 23, 2017

Luminescence of tartrate bridged dinuclear 2,2′-bipyridine platinum(ii) complexes: emission color controlled by intra- and inter-molecular interactions in the solid state

Abstract

Novel dinuclear PtII complexes with a chiral (L-) and an achiral (meso-) tartrate [{PtII(bpy)}2(μ-x-tart)] (bpy: 2,2′-bipyridine; tartH22−: tartrate; x = L (1), meso (2)) and with a racemic (DL-) tartrate [{PtII(bpy)}2(μ-D-tart)][{PtII(bpy)}2(μ-L-tart)] (3) were synthesized, and the influence of their stereochemistry on their molecular and crystal structures affecting their luminescence was discussed. Effects of the dinuclearity on the structures and luminescence were revealed by comparison with those of a novel racemic mononuclear complex [PtII(bpy)(D-tartH2)][PtII(bpy)(L-tartH2)] (4). The X-ray crystallography showed the crystallization of 1 in two polymorphs, namely monoclinic 3[1·6H2O] () and triclinic 2[1·6H2O] (), and those of other complexes in monoclinic hydrate crystals 2·12.5H2O, 3·4H2O, and 4·H2O. The chiral complexes in , , and 3·4H2O showed clamshell-like structures with Pt–Pt and π–π interactions, while the achiral complex in 2·12.5H2O displayed a twisted form without intramolecular interactions. The complexes in were assembled in a right-handed helical arrangement through significant Pt–Pt interactions, and those in and 3·4H2O were stacked in one-dimensional columns through significant and slight π–π interactions, respectively. The complex in 2·12.5H2O constructed an intermolecular dimer through Pt–Pt interactions with its adjacent complex. The crystal structure of 4·H2O displayed a three-dimensional network architecture through π–π interactions and hydrogen bonding. These crystals exhibited luminescence depending on their molecular and crystal structures (λmax nm = 535 (4·H2O), 569 (3·4H2O), 621 (2·12.5H2O), 649 (), and 656 ()). The formations of intermolecular dimers and clamshell-like structures through Pt–Pt interactions in 2·12.5H2O and in 3·4H2O, respectively, lead to red-shifts in emissions compared to 4·H2O, and further low-energy emissions of and were derived from the intermolecular Pt–Pt and π–π interactions, respectively.

Graphical abstract: Luminescence of tartrate bridged dinuclear 2,2′-bipyridine platinum(ii) complexes: emission color controlled by intra- and inter-molecular interactions in the solid state

Supplementary files

Article information

Article type
Paper
Submitted
01 Mar 2017
Accepted
18 May 2017
First published
05 Jun 2017

Dalton Trans., 2017,46, 7612-7618

Luminescence of tartrate bridged dinuclear 2,2′-bipyridine platinum(II) complexes: emission color controlled by intra- and inter-molecular interactions in the solid state

K. Ohno, H. Tanuma, Y. Kusano, S. Kaizaki, A. Nagasawa and T. Fujihara, Dalton Trans., 2017, 46, 7612 DOI: 10.1039/C7DT00745K

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