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The article focuses on a study which investigated the vapochromism and hydrogen-ion concentration-dependent coloration of Dicyano(4',4'-dicarboxy-2',2'-bipyridine)platinum(II). The chemical complex used in this study exhibits a hydrogen-ion concentration-dependent multicolored polymorphism and vapochromic behavior upon exposure to certain volatile organic compounds.

A cyclometalated dinuclear platinum(II) complex bridged with pyridine-2-thiolate ions, [Pt2(ppy)2(pyt)2] (Hppy = 2-phenylpyridine, Hpyt = pyridine-2-thiol) and its oxidized platinum(Ill) complex, [Pt2Cl2(ppy)2(pyt)2] have been synthesized and characterized. The divalent complex exhibits intense red luminescence both in solution and in the solid states. Corresponding to the short Pt ... Pt distance (2.849(1) Å) for [Pt2(ppy)2(pyt)2], the reversible conversion between the divalent and trivalent complexes occurs easily with appearance and disappearance of the luminescence. [ABSTRACT FROM AUTHOR]