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The title complex (C 5 H 25 Cu NO 13 S)has been synthesized and characterized by single crystal X-ray analysis ( R  = 0.059 for 5934 observed  hkl ; Mo K α   data). The complex crystallizes in the triclinic space group  P [unk] with  a  = 8.491(1),  b  = 8.942(2),  c  = 12.144(2) Å,  α  = 101.17(2),  β  = 96.69(1),  γ  = 114.04(1)°, and  Z  = 2. The Cu(II) atom is in a distorted square pyramidal coordination environment, being surrounded by a carboxy oxygen atom of the betaine ligand [1.944(5) Å and three aqua oxygen atoms [Cu–O = 1.921(5) Å ∼ 1.968(5) Å] in the basal plane, with another aqua oxygen atom occupying the apical position [2.249(2) Å]. Hydrogen bonds are formed by the aqua ligands, the lattice water molecules, the uncoordinated oxygen atom of the carboxy group, and the sulfate ion to generate a three-dimensional network.

zeitschrift für kristallographie - crystalline materials

Metal-betaine interactions. XVIII. Crystal structure of tetraaqua(trimethylammonioacetato)copper(III) sulfate trihydrate, [Cu(Me 3 NCH 2 CO 2 )(H 2 O) 4 ](SO 4 ) · 3H 2 O