title: A new compound in kidney stones? Powder X-ray diffraction study of calcium glycinate trihydrate.
abstract: The present identification of a new compound in kidney stones is relevant in clinical practice. Here, poly[[di-μ-aqua-bis(glycinato-κ(2)N,O)calcium(II)] monohydrate], {[Ca(C2H4NO2)2(H2O)2]·H2O}n, has been identified in a possible kidney concretion, although it could be a 'false calculus' associated with Munchausen syndrome. The crystal packing is characterized by an infinite zigzag chain of Ca atoms in [Ca(OW)4O2N2] (OW is a water O atom) square antiprisms, sharing edges formed by water molecules. An uncoordinated water molecule interconnects the parallel chains in a three-dimensional hydrogen-bonding scheme. Similarities between the trihydrate and the monohydrate are described.
authors.affiliation: Institut des Molécules et des Matériaux du Mans, CNRS UMR 6283, Université du Maine, 72085 Le Mans, France. armel.le_bail@univ-lemans.fr
authors.forename: Armel
authors.initials: A
authors.lastname: Le Bail
authors.forename: Michel
authors.initials: M
authors.lastname: Daudon
authors.forename: Dominique
authors.initials: D
authors.lastname: Bazin
mesh_terms: D002118:Calcium / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005998:Glycine / Q000737:chemistry*; D006801:Humans; D006860:Hydrogen Bonding; D007669:Kidney Calculi / Q000737:chemistry*; D008297:Male; D008958:Models, Molecular; D011208:Powders / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; D011208:Powders; D014867:Water; D002118:Calcium; D005998:Glycine