CRYSTAL AND MOLECULAR-STRUCTURE OF ACETOAMIDOGLUTARATE)(2)HEXAAQUO-CENTER-DOT-2H(2)O, AN UNUSUAL MACROCYCLIC DIMER WITH PENTACOORDINATED ZNIN A SLIGHTLY DISTORTED TRIGONAL BIPYRAMID

The crystal and molecular structure of the title compound, [Zn(II)](2) (DAG)(2), were determined and the results compared with those obtained for similar N-protected amino acids.(1) In the crystalline state, 16- membered macrocyclic dimers are held together by hydrogen bridges in a triclinic P $($) over bar$$ 1 lattice. The Zn(II) ions are pentacoord inated to oxygens in a slightly distorted trigonal bipyramid; The trig onal plane is formed by two carboxylic oxygens and an oxygen atom from a water molecule, whereas the apical positions are occupied by two ot her oxygens from the remaining coordinated water molecules. The ligand s form bridges between cations providing the cyclic dimers, whereas si milar but shorter systems form pseudo polymer sheets.(1)