| Abstract: A binuclear chromium complex [Cr2(OH)2(2-pca)4]·3H2O (2-pca=pyrazine-2-carboxylate anion) was hydrothermally prepared and characterized by single crystal X-ray diffraction, FTIR spectra, elemental analysis, luminescence and thermal analysis. It crystallizes in the monoclinic system, space group P21/c, with a=1.566 35(15), b=0.847 70(6), c=1.974 60(18) nm, β=90.645 0(10)°, C20H20Cr2N8O13, Mr=684.44, V=2.621 7(4) nm3, Dc=1.734 g·cm-3, F(000)=1 392, μ=0.913 cm-1, Z=4, the final R=0.044 7 and wR=0.112 0 for 3 251 reflections with I>2σ(I). X-ray diffraction analysis reveals that each Cr(Ⅲ) center is octahedrally coordinated by two nitrogen atoms and two oxygen atoms from two pyrazine-2-carboxylate anion ligands, and another two oxygen atoms from two hydroxyl groups. The two Cr(Ⅲ) centers are bridged by two μ2-O of OH group. CCDC: 752196. |
