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Free keywords:
powder diffraction; simulated annealing; one-dimensional spin chain; copper coordination polymer
Abstract:
The purple colored coordination polymer [1 Cu](n) was obtained
from 2,5-bis(pyrazol-1-yl)-1,4-dihydroxybenzene and CuBr2 in
aqueous ammonia. The crystal structure of [1 Cu](n) was
determined from high resolution X-ray powder diffraction data
using the method of simulated annealing. In the solid state, [1
Cu](n) features largely independent linear chains, all of them
being oriented parallel to the c-axis of the crystal. The Cu
ions are coordinated in a square-planar fashion by two nitrogen
atoms and two anionic oxygen donors. Magnetic susceptibility
and magnetization measurements indicate the Cu ions in [1
Cu](n) to be antiferromagnetically coupled with a coupling
constant of about 20 K.
