Synthesis and Crystal Structure of a New Complex {[Co~(Ⅲ)L_2]·[Co~(Ⅱ)(H_2O)_6]_(0.5)·2.25H_2O}_4 (H_2L = N-(2-Hydroxyphenyl)salicylidenimine)

The reaction of Co(OAc)2·4H2O with the Schiff base H2L in a methanol solution affords the red crystals of {[CoIIIL2]·[CoII(H2O)6]0.5·2.25H2O}4 1 (H2L = N-(2-hydroxyphenyl) sali-cylidenimine). The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/n, C104H114Co6N8O37, Mr = 2421.61, a = 10.625(3), b = 16.335(4), c = 15.265(4) , β = 102.990(4)o, V = 2581.6(11) 3, Z = 1, Dc = 1.558 g/cm3, μ = 1.034 mm-1, F(000) = 1252, R = 0.0414 and wR = 0.1167 for 5889 reflections. The Co(III) atom is six-coordinated by two nitrogen atoms and four oxygen atoms of two tridentate L ligands. The abundant hydrogen bonding interactions extend the complex into a one-dimensional supra-molecular framework. The uncoordinated water molecules act as space-fillers and consolidate the whole architecture through the hydrogen bonding interactions.     

Synthesis and Crystal Structure of a New Tetracopper Complex [Cu(H_2O)_3Cu(HCDTA)]_2(ClO_4)_2·H_2O

A new tetracopper complex [Cu(H2O)3Cu(HCDTA)]2(ClO4)2·H2O (CDTA = transcyclohexane-1,2-diamine-N,N,N′,N′-tetraacetate) has been prepared and characterized by singlecrystal X-ray diffraction analysis. The crystal adopts space group C2/c with a = 16.990(10), b = 9.150(5), c = 29.318(17) , β = 104.289(9)°, V = 4417(4) 3, Z = 4, C28H52Cl2Cu4N4O31, Mr = 1265.80, Dc = 1.904 g/cm3, μ = 2.130 mm-1, F(000) = 2584, T = 293(2) K, the final R = 0.0328 and wR = 0.0809 for 4938 observed reflections (I 2σ(I)). The tetracopper units are interconnected by weak covalent bonds into a layered structure.