Abstract
The title compound, {[Cu2(C7H4O3)2(H2O)2]·2H2O} n , contains two copper(II) cations in special positions (one on a twofold rotation axis and one on an inversion centre) and the the salicylate ligand in its dianionic form. By four- and six-coordinate metal coordination, chains are formed parallel to [001], which are extended by O-H⋯O hydrogen bonding into sheets extending parallel to (100). These sheets are weakly connected by O-H⋯O hydrogen bonding via the non-coordinating lattice water mol-ecules into a three-dimensional network.
Highlights
Cations in special positions and the the salicylate ligand in its dianionic form
By four- and six-coordinate metal coordination, chains are formed parallel to [001], which are extended by O—H O hydrogen bonding into sheets extending parallel to
Crystal structures of copper salicylate are only known with the monoanionic HSal ligand
Summary
Salicylic acid (2-hydroxybenzoic acid, H2Sal) has two acidic hydrogen atoms and the corresponding pKa values are. Crystal structures of copper salicylate are only known with the monoanionic HSal ligand. They occur as a tetrahydrate (Hanic & Michalov, 1960; Rissanen et al, 1987) and as a dihydrate (Jagner et al, 1976), the latter being described as an order–disorder structure. In an attempt to crystallize copper(II) salicylate we obtained a mixture of crystals (see Synthesis and Crystallization), among which was the title compound (I) with composition [Cu2(C7H4O3)2(H2O)2]2H2O that involves the dianionic ligand Sal. Additional bonds to O atoms outside the asymmetric unit indicate the completed coordination environments of the two copper(II) cations
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