New 3-D Chiral Framework of Indium with 1,3,5-Benzenetricarboxylate

A new complex, [In2(μ-OH)2(btc)2]n·2nHpy (1) (btc = 1,3,5-benzenetricarboxylate; py = pyridine), is hydrothermally synthesized from the reaction of InCl3, H3btc, and pyridine. Complex 1 crystallizes in the monoclinic P21 space group [a = 7.3181(12) Å, b = 17.0195(23) Å, c = 10.5789(17) Å, β = 102.651(6)°, and Z = 2]. Indium(III) centers in 1 are bridged by btc ligands in various coordination modes to form the nonclose rings which are further interlinked along crystallographic a-axis and (011) plane to result in a nonpenetrated 3-D anionic framework growing as homochiral tunnels. Compound 1 is fully characterized by fluorescence spectroscopy, second harmonic generation measurement, infrared, and thermogravimetric analysis.