Water-Molecule-Driven Vapochromic Behavior of a Mononuclear Platinum(II) System with Mixed Bipyridine and Thioglucose

Abstract

A mononuclear platinum(II) complex with mixed bpy and H4tg(-) ligands, [Pt(H4tg-S)2(bpy)]·2H2O (1a; bpy = 2,2'-bipyridine and H5tg = 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(H4tg-S)2(dmbpy)]·H2O (2a; 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 1a and 2a is due to the difference in their hydrogen-bonding networks, which involve solvated water molecules.

Vapochromic Platinum(II) Complexes: Crystal Engineering toward Intelligent Sensing Devices

“…Konno and co‐workers recently reported a vapochromic Pt II complex that bore a thioglucose as the ligand, [Pt(bpy)(H 4 tg‐S) 2 ] ( 7 ; Figure 8, H 4 tg‐S = 1‐thio‐β‐ D ‐glucose) 36. As expected from the molecular structure of the H 4 tg‐S ligand, which has four hydroxy groups, thereby enabling it to form several hydrogen bonds, complex 7 was obtained as a dihydrate form, 7· 2H 2 O.…”

“…(b) Photographs of 7· 2H 2 O; (upper) absorption and (lower) emission color changes upon exposure to MeOH and H 2 O vapors. Reprinted with permission from the literature 36. Copyright 2014 American Chemical Society.…”

Coordination-based vapochromic behavior of a luminescent Pt(ii) complex with potassium ions

“…4 Through the Type I mechanism, vapochromic materials exhibit color and luminescence changes by modifying intermolecular interactions on chromophores induced by vapor molecules. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] In contrast, the Type II mechanism allows the generation of vapochromism from the direct coordination of vapor molecules to the chromophore, resulting in a change in the absorption/ emission energy. [23][24][25][26][27][28][29][30][31][32][33][34][35][36] Pt(II) complexes with Pt/Pt interactions (Type I mechanism) are promising candidates of vapochromic materials.…”

Chromic Platinum Complexes Containing Multidentate Ligands

“…The family of bipyridine‐based vapochromic complexes increased in number with the incorporation of other ancillary ligands, such as chlorides, [52] thioglucose, [53] acetylides, [54–56] phenylpyridine, [57] and tartrate [58] . All of these species display a chromic behavior originating from a vapor‐induced molecular rearrangement and the disruption of Pt⋅⋅⋅Pt interactions.…”