Τίτλος:
Synthesis, X-Ray Structure, and Characterization of a Complex Containing the Hexakis(urea)cobalt(II) Cation and Lattice Urea Molecules
Περίληψη:
The 12 : 1 reaction of urea (U) with CoI2 in EtOH yielded the
“clathrate-coordination” compound [CoU6] I-2 center dot 4U (1).
The complex crystallizes in the monoclinic space group P2(1)/c. The
lattice constants are a = 9.844(4), b = 7.268(3), c = 24.12(1) angstrom,
and beta = 98.12(1)degrees. The crystal structure determination
demonstrates the existence of octahedral [CoU6](2+) cations, I-
counterions, and two different types (two U-1 and two U-2) of hydrogen-
bonded, lattice urea molecules. The [CoU6](2+) cations and the U-1
lattice molecules form two- dimensional hydrogen- bonded layers which
are parallel to the ab plane. The I- anions are placed above and below
each layer, and are hydrogen bonded both to U1 molecules and
[CoU6](2+) cations. Each U-2 molecule is connected to a [CoU6](2+)
cation through an N-H center dot center dot center dot O hydrogen bond
resulting in a three- dimensional network. Room temperature magnetic
susceptibility and spectroscopic (solid-state UV/Vis, IR, Raman) data of
1 are discussed in terms of the nature of bonding and the known
structure.
Copyright (c) 2007 Labrini Drakopoulou et al. This is an open access
article distributed under the Creative Commons Attribution License,
which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.
