Abstract
Crystalline polyoxo-titanium clusters (PTCs), as a molecular model of TiO2 nanomaterials, have attracted unprecedented attention due to their designable structure, tunable band gap, catalysis, and photochromic properties. A new trinuclear Ti3-oxo cluster, [Ti3(µ2-O)(µ3-O)(abz)6(OiPr)2] CH3CNH2O (Ti3), was synthesized by solvothermal method with a yield of 60% by using 4-aminobenzoic acid as ligand. Single-crystal X-ray diffraction shows that it has a [Ti3(µ2-O)(µ3-O)(abz)6(OiPr)2] trinuclear cluster structure. Ti3 crystallizes in monoclinic space group P21/c with a = 11.091(1), b = 22.837(2), c = 22.754(1) Å, ß = 90.580(6)°, V = 5763.0(6) Å3, Z = 4, Dc = 1.345 g·cm−3, F(000) = 2412, µ = 2.743 mm−1, R = 0.0796, and wR = 0.2260 (I >2σ(I)).Ti3 shows typical semiconductive behavior determined by temperature-dependent conductivity test. The chemiresistive humidity sensor fabricated by Ti3 showed good performance, including high response (four orders of magnitude current change from 0 to 100% RH) and fast response time (160 s) and recovery time (26 s).
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