Calcium and strontium salts of (glycinato-κ2N,O)oxidobis(peroxido-κ2O,O′)vanadate(V) tetrahydrate

Abstract
The title salts calcium (glycinato-κ2N,O)oxidobis(peroxido-κ2O,O′)vanadate(V) tetrahydrate, Ca[VO(O2)2(NH2CH2COO)]·4H2O, and strontium (glycinato-κ2N,O)oxidobis(peroxido-κ2O,O′)vanadate(V) tetrahydrate, Sr[VO(O2)2(NH2CH2COO)]·4H2O, crystallized at pHca7.4 with similar lattice parameters. The glycinate anion acts as a bidentateN,O-chelating ligand, and the V atom has a pentagonal bipyramidal geometry, with two η2-peroxo groups and the glycinate N atom in the equatorial plane, and one terminal oxo and a glycinate O atom at the axial positions. The H atoms of three of the four water molecules in the strontium salt exhibited disorder over three positions for each molecule.

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