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Synthesis, Crystal Structure and Properties of Transition Metal-Azide Compounds with Bis(pyrazol-1-yl)methane

Zhang L., Gao H., Ge Y., Peng F., Xue H.

Polish Journal of Chemistry

2006

Vol. 80, nr 9

1465-1471

Two new compounds, Co(bpm)2(N3)2 (1) and {[Ni(bpm)2(H2O)2][Ni(bpm)2(N3)2]}(ClO4)2 (2), where bpm refers to bis(pyrazol-1-yl)methane, have been prepared and characterized by elemental analyses, IR, UV-Vis spectra and X-ray diffraction. Crystal data for 1: monoclinic, space group P21/n with a = 10.394(4), b =14.410(5), c = 12.591(4) Alfa,Beta = 91.194(7)°, V =1885.6(11) Alfa3 and Z= 4. Crystal data for 2: triclinic, space group P1with a = 8.7673(6), b = 8.9618(6), c = 13.5653(9) Alfa, alfa = 84.6040(10) , beta= 84.4230(10) , _ = 79.6040(10), V = 1040.19(12) Alfa3 and Z = 1. Complex 1 is a neutral monomer molecule, in which CoII ion is coordinated by four nitrogen atoms from two chelating bpm and two terminal azide ligands to form a cis-octahedral configuration. However, compound 2 is composed of a neutral [Ni(bpm)2(N3)2] entity, one [Ni(bpm)2(H2O)2]2+ cation and perchlorate anions, in which the neutral Ni(bpm)2(N3)2 entity is in a trans-six-coordinated configuration. The uncoordinated terminal nitrogen atom of azide forms O-H.....N hydrogen bonds with the coordinated H2O molecule to afford a one-dimensional chain structure.