INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
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 - 978
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.