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Luminescent ionic liquids, based on anionic Pt(ii) complexes, were developed. Depending on the cyclometalating ligands used, they exhibit thermochromic luminescence with different colours. The chromic properties in the flexible liquid and glass states emerge through the self-assembling character of the square-planar Pt(ii) complexes. [ABSTRACT FROM AUTHOR]

An ionic liquid fabricated from an anionic cyclometalated platinum(ii) complex and an imidazolium cation exhibits dual emission from the monomeric and aggregated forms of the platinum complex anions, leading to temperature-dependent color changes of luminescence. [ABSTRACT FROM AUTHOR]

The title dinuclear platinum(III) complex, [Pt2(C11H2N)2(C5H4NS)4], forms two crystal structures, viz. the non-solvated and acetonitrile-solvated (C2H3N) forms. For both forms, two (2-pyridylphenyl)platinum units are bridged by two pyridine-2-thiolate (pyt) anions in a head-to-tail configuration, and the other two pyridine-2-thiolate anions occupy the axial position, coordinated through their S atoms. The most remarkable difference between the two forms is the orientation of the axial monodentate ligands. Those for the solvated form are located over the 2-pyridylphenyl ligands, being related by a twofold axis which lies through the centre of the Pt—Pt bond, while the axial pyt ligands for the non-solvated form are oriented irregularly, which is attributable to the dimeric arrangement in the crystal. [ABSTRACT FROM AUTHOR]

Vapochromic behavior of the crystal of dicyano(2,2′-bipyridine)platinum(II), [Pt(CN) 2 (bpy)], has been investigated structurally and emission spectroscopically. Red Form with an infinite Pt···Pt chain transforms to Yellow Form reversibly by taking up water vapor. The crystal structure of Yellow Form ([Pt(CN) 2 (bpy)]·H 2 O) was determined by X-ray analysis: the square-planar complexes form the inclined stack with short and long Pt···Pt distances (3.3279(3) and 4.6814(3) Å). The crystal water makes hydrogen bonds with CN - ligands connecting the stacks. The transformation is accompanied by the sensitive luminescence change as well as the color change, which reflects the change of the Pt⋯Pt electronic interactions. The sensitive vapochromism for this system is attributable to the slight deformation of the stacking structure induced by water molecules. platinum complex luminescence spectrum vapochromism metal-metal interaction crystal structure [ABSTRACT FROM AUTHOR]

A hybrid vapoluminescent system exhibiting fast and repeatable response was constructed using periodic mesoporous organosilica with bipyridine moieties (BPy-PMO) and a Pt(II) complex bearing a potentially luminescent 2-phenylpyridinato (ppy) ligand. An intense red luminescence appeared when the Pt(II)-complex immobilised BPy-PMO was exposed to methanol vapour and disappeared on exposure to pyridine vapour. The ON-OFF vapochromic behaviour occurred repeatedly in a methanol/pyridine/heating cycle. Interestingly, a rapid response was achieved in the second cycle and cycles thereafter. Scanning and transmission electron microscopies (SEM/TEM), absorption and emission, and nuclear magnetic resonance spectroscopies, mass spectrometry, and powder X-ray diffraction indicated that methanol vapour induced Si-C cleavage and thus liberated [Pt(ppy)(bpy)]Cl (bpy = 2,2′-bipyridine) from the BPy-PMO framework. Furthermore, the self-assembling properties of the Pt(II) complex resulted in the formation of highly luminescent micro/nanocrystals that were homogeneously dispersed on the porous support. The unique vapoluminescence triggered by the unprecedented protodesilylation on exposure to protic solvent vapour at room temperature is attributable to BPy-PMO being a giant ligand and an effective vapour condenser. Consequently, this hybrid system presents a new strategy for developing sensors using bulk powdery materials. [ABSTRACT FROM AUTHOR]

A novel Pt(II)–diimine complex exhibits an interesting vapochromic shape‐memory behavior. The amorphous form is converted to a red luminescent vapor‐adsorbed form in the presence of alcoholic vapors. The vapor‐adsorbed form can release the vapors without collapse of the porous structure; this enables it to adsorb other vapors. The vapor‐free porous form can easily be converted to the initial amorphous form by manual grinding. These transformations enable the design of a new chemical sensor with vapor history and ON–OFF switching functions. More information can be found in the Full Paper by A. Kobayashi, M. Kato et al. on page 2682 ff. [ABSTRACT FROM AUTHOR]

Examines the crystal structure of dichloro(4,4-dinonyl-2,2'-bipyridine- kappa[sup 2]N,N')platinum(II). Bipyridine moiety with two long alkyl-chain substituents contained in the complex; Complex forming a segregated packing structure made up of the alkyl-chain layers and paired coordination sites.