Synthesis and Crystal Structure of a Novel Tetravanadate Modified by Chiral Racemoid Zirconium Complex

1 INTRODUCTION Polyoxometalate anions are a broad class of dis- crete metal-oxide compounds MxOyn–, which are of both fundamental and practical interest in a range of areas, including catalysis, biochemistry, medicine and solid state devices[1~6]. Recently, the structural chemistry of vanadium oxides in combination with secondary metal-ligand cations has attracted much attention[7~17]. These hybrid materials manifest the structural influences both of coordination preferen- ces of the sec…     

Hydrothermal Synthesis, Crystal Structure and Magnetic Properties of a Novel Zero-dimensional Manganese(Ⅱ) Complex with 2,2''-Diphenic Acid and 1,10-Phenanthroline Ligands

A novel metal-organic coordination polymer [Mn3(2,2'-dipha)3(phen)6]n·3nH2O (2,2'-dipha = 2,2'-diphenic acid, phen = 1,10-phenanthroline) 1 has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, elemental analyses, IR spectroscopy, and magnetic susceptibility measurements. The crystal crystallizes in triclinic, space group P1- with a = 16.921(5), b = 18.307(5), c = 18.450(5) (A), α = 113.369(5), β = 108.529(5), γ = 102.984(5)° , V = 4553(2) (A)3, C114H72Mn13N12O14.25, Mr = 2002.66, Dc = 1.461 g/cm3, λ(MoKα)= 0.488 mm-1, the final F(000) = 2058, Z = 2, R = 0.0491 and wR = 0.0980 for 9087 observed reflections (Ⅰ＞2σ(Ⅰ)). In the crystal structure, the manganese atom is six-coordinated with two carboxylate oxygen atoms from different carboxylate groups of the same dipha and four nitrogen atoms from two different phen ligands, showing a slightly distorted octahedral geometry. Furthermore, it exhibits a zero-dimensional structure with dipha-Mn-phen- as building units. Variable-temperature magnetic measure shows an overall anti-ferromagnetic behavior for compound 1.