• K V Muralidharan

      Articles written in Pramana – Journal of Physics

    • The crystal structure of bis-(L-threonine) copper(II).H2O

      V Amirthalingam K V Muralidharan

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      The crystal structure of bis-(L-threonine) copper (II).H2O, Cu (C4H8NO3)2.H2O has been determined by heavy atom and Fourier methods and refined by least-squares using visually estimated three-dimensional x-ray data of 893 reflections. The blue crystals are monoclinic, space groupP21 withα=11·02,b=4·90,c=11·16Å andβ=93·5°,Z=2. The finalR is 0·10. Coordination of copper is distorted square pyramidal with ligands intrans configuration. The conformation of one of the aminoacid ligand is identical with Ls-Threonine while the other has a conformation with torsional angleχ1, 2=−74(1)°.

    • The structure of bis-(L-threonine) copper (II). H2O

      V Amirthalingam K V Muralidharan

      More Details Fulltext PDF
    • The crystal structure of (L-proline-L-alanine) copper (II)·2·5 H2O

      V Amirthalingam K V Muralidharan

      More Details Abstract Fulltext PDF

      The crystal and molecular structure of (L-proline-L-alanine) Cu·2·5 H2O has been determined by the heavy atom method with 583 visually estimated reflexions and refined by full matrix least squares toR=0·101. The crystals are monoclinic witha=16·47 (3),b=7·74 (2),c=9·51 (3) Å andβ=109·7 (5)°; space groupC2;Z=4. The copper coordination is nearly square pyramidal with one water in the basal plane and another occupying the apical together with the aminoN, peptideN and the carboxylO of the dipeptide in the coordination. The Cu-peptide-Cu linkage isvia the hydrogen bonding between the water in the basal plane and the carbonyl O atom of the proline residue. One water is on the 2-fold axis.

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