resumo
Two new structures containing N-(phosphonomethyl)iminodiacetate residues (pmida(4-)) and 4,4'-bipyridine, (4 4'-bpyH)(2)[M(4,4'-bpy)(H2O)(4)][V2O2(pmida)(2)] center dot 2H(2)O (where M = Mn2+ or Co2+), have been synthesised using hydrothermal methods and characterised structurally by single-crystal and powder X-ray diffraction, elemental analysis, infrared spectroscopy and thermal analysis. The magnetic behaviour of these two materials is also described. The compounds are formed by close packing (mediated by electrostatic interactions) of one-dimensional [M(4,4'-bpy)(H2O)(4)](n)(2n+) cationic polymers and 4,4'-bpyH(+) cations, along with dimeric centrosymmetric [V2O2(pmida)(2)](4-) anionic moieties. Hydrogen-bonded sub-network formed by highly directional and very strong homonuclear O-H center dot center dot center dot O and heteronuclear N+-H center dot center dot center dot O interactions interconnects these moieties into a three-dimensional framework. Systematic surveys of the Cambridge Structural Database were performed to collect information on the distribution of bond distances (Mn-N, Mn-O-water, Co-N, Co-O-water, V-N, V-O-carboxylate and V=O), and to characterise the local coordination environments of Mn2+, Co2+ and V4+. (c) 2005 Elsevier B.V. All rights reserved.
palavras-chave
CADMIUM-ORGANIC FRAMEWORK; 3-HYDROXYPICOLINIC ACID HPICOH; COORDINATION POLYMER; CRYSTAL-STRUCTURES; METAL CARBOXYLATES; BUILDING-BLOCKS; TRIMESIC ACID; COMPLEXES; NETWORKS; 4,4'-BIPYRIDINE
categoria
Chemistry
autores
Shi, FN; Paz, FAA; Girginova, PI; Amaral, VS; Rocha, J; Klinowski, J; Trindade, T
nossos autores
Fa-Nian Shi
Investigador
Filipe Alexandre Almeida Paz
Investigador Principal
João Rocha
Prof. Catedrático
Tito Trindade
Professor Catedrático