INVESTIGADORES
CUKIERNIK Fabio Daniel
artículos
Título:
The topotactic dehydration of monoclinic {[Co(pht)(bpy)(H2O)2]·2H2O}n into orthorhombic [Co(pht)(bpy)(H2O)2]n (pht is phthalate and bpy is 4,4-bipyridine)
Autor/es:
MIGUEL A. HARVEY; SEBASTIAN SUAREZ; FABIO D. CUKIERNIK; RICARDO F. BAGGIO
Revista:
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2014 vol. 70 p. 978 - 982
ISSN:
0108-2701
Resumen:
Controlled heating of single crystals of the previously reported
[Ko¨ ferstein & Robl (2007). Z. Anorg. Allg. Chem. 633, 1127?
1130] dihydrate {[Co(pht)(bpy)(H2O)2]2H2O}n, (II) [where
pht is phthalate (C8H4O4) and bpy is 4,40-bipyridine
(C10H8N2)], produced a topotactic transformation into an
unreported diaqua anhydrate, namely poly[diaqua(2-benzene-
1,2-dicarboxylato-2O1:O2)(2-4,40-bipyridine-2N:N0)-
cobalt(II)], [Co(C8H4O4)(C10H8N2)(H2O)2]n, (IIa). The structural
change consists of the loss of the two solvent water
molecules linking the original two-dimensional covalent
substructures which are the ?main frame? of the monoclinic
P2/n hydrate (strictly preserved during the transformation),
with further reaccommodation of the latter. The anhydrate
organizes itself in the orthorhombic system (space group
Pmn21) in a disordered fashion, where the space-groupsymmetry
restrictions are achieved only in a statistical sense,
with mirror-related two-dimensional planar substructures,
mirrored in a plane perpendicular to [100]. Thus, the
asymmetric unit in the refined model is composed of two
superimposed mirror-related ?ghosts? of half-occupancy each.
Similarities and differences with the parent dihydrate and
some other related structures in the literature are discussed.