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The Crystal Structure of benzoyl – histidine monohydrate

Published/Copyright: July 28, 2010

Abstract

The crystal structure of benzoyl-histidine monohydrate (BYLH hereafter), C13H12N3O3 · H2O was determined from three dimensional data of 3012 independent reflections measured on a Enraf-Nonius (CAD4) single crystal diffractometer. The compound crystallizes in the orthorhombic space group P212121 with cell dimensions α = 7.102(1) Å, β = 13.783(3) Å, c = 14.160(4) Å, V = 1385.92 Å3, F.W. = 277.28, F(000) = 584 ϱcalc = 1.32 g cm−3 and Z = 4.

The structure was solved with direct methods. All positional and anisotropic thermal parameters were refined by full-matrix least-squares calculations. The final reliability factor was R = 0.040, while the weighted one was Rw = 0.034. The H atoms found in the difference Fourier map were refined isotropically.

The compound consists of a histidine molecule bound to a benzoyl group. There is also a cocrystallized water molecule stabilized through a hydrogen bridge.

The 5-membered ring of the histidine has its tautomeric form, after the transfer of the H atom from the Nδ to the Nε atom of the ring. There is an sp2 conformation around C6 while the conformation around C3 is that of sp3. The histidine ring forms with the benzene ring a dihedral angle of 109.8(1)°.

All angle values and bond distances agree very well with the expected values in the literature.

Published Online: 2010-7-28
Published in Print: 1994-10-1

© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München

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