Water-Molecule-Driven Vapochromic Behavior of a Mononuclear
Platinum(II) System with Mixed Bipyridine and Thioglucose
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Abstract
A mononuclear platinum(II) complex
with mixed bpy and H<sub>4</sub>tg<sup>–</sup> ligands, [Pt(H<sub>4</sub>tg-<i>S</i>)<sub>2</sub>(bpy)]·2H<sub>2</sub>O (<b>1a</b>; bpy = 2,2′-bipyridine and H<sub>5</sub>tg = 1-thio-β-d-glucose), is photoluminescent in the
solid state and undergoes facile and reversible removal of solvated
water molecules accompanied by changes in its absorption and emission
wavelengths. The analogous dmbpy complex, [Pt(H<sub>4</sub>tg-<i>S</i>)<sub>2</sub>(dmbpy)]·H<sub>2</sub>O (<b>2a</b>; dmbpy = 4,4′-dimethyl-2,2′-bipyridine), is also emissive
in the solid state, but its absorption and emission spectra remain
unchanged after dehydration. X-ray crystallographic analyses revealed
that the difference in the chromism of <b>1a</b> and <b>2a</b> is due to the difference in their hydrogen-bonding networks, which
involve solvated water molecules
