Interaction of pentaphenylantimony with carboranedicarboxylic acidстатья
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Дата последнего поиска статьи во внешних источниках: 24 марта 2017 г.
Аннотация:The reaction of equimolar amounts of pentaphenylantimony with carboranedicarboxylic acid in toluene
lead to tetraphenylantimony carborane carboxylate (1) in high yield. When using 2:1 M ratio of initial
reagents, bis(tetraphenylantimony) carborane bis(carboxylate) (2) was obtained in 94% yield. Sb atoms in
1 and 2 form the distorted trigonal-bipyramidal coordination with carboxylate and phenyl ligands in
axial positions (C axial SbO are 174.06(12) and 175.74(13) , 176.77(13) respectively). The SbeO и SbeC
bond distances are 2.469(3) Å and 2.095(4)À2.136(4) Å in 1 and 2.275(3), 2.364(3) and 2.112(4)À2.173(4)
Å in 2. There are no intramolecular contacts in 1 between Sb and О atom of CO group. In 2 the bond
distances Sb/O(1⁄4C) (3.203(4) и 3.213(4) Å) are much less than a sum of van der Vaals radii of Sb and O
atoms. Crystal structures of 1 and 2 are characterized by weak intermolecular hydrogen bonds H/O
(2.25e2.53 and 2.54 Å, respectively).