resumo
Two crystalline compounds, X center dot [Ge(OH)(2)(C(2)O(4))(2)]center dot n(H(2)O) [where X = C(4)H(12)N(2)(2+) (H(2)pipz(2+)) and n = 1 for compound I, and X = C(10)H(10)N(2)(2+) (H(2)bipy(2+)) and n = 2 for II], were synthesised using hydrothermal synthetic approach and characterised structurally using single-crystal X-ray diffraction, vibrational spectroscopy (FT-IR and FT-Raman), thermogravimetric analysis (TGA) and CHN elemental composition. The crystalline compounds contain a novel anionic complex [Ge(OH)(2)(C(2)O(4))(2-), which co-crystallises with organic cations (piperazinium in I, and 4,4'-bipyridinium in II) and water molecules of crystallisation. These chemical moieties are involved in extensive three-dimensional (3D) hydrogen bonding networks composed of strong and highly directional O-H center dot center dot center dot O and N-H center dot center dot center dot O interactions. (C) 2007 Elsevier B.V. All rights reserved.
palavras-chave
METAL-ORGANIC FRAMEWORK; X-RAY-DIFFRACTION; COORDINATION POLYMERS; HYDROTHERMAL SYNTHESIS; STRUCTURAL-CHARACTERIZATION; CRYSTAL-STRUCTURE; DESIGN; N-(PHOSPHONOMETHYL)IMINODIACETATE; FUNCTIONALITY; CHEMISTRY
categoria
Chemistry
autores
Shi, FN; Cunha-Silva, L; Paz, FAA; Hardie, MJ; Klinowski, J; Rocha, J; Trindade, T
nossos autores
Fa-Nian Shi
Investigador
Filipe Alexandre Almeida Paz
Investigador Principal
João Rocha
Prof. Catedrático
Tito Trindade
Professor Catedráticoagradecimentos
We are grateful to FEDER, POCI (Portugal) and to the Fundacao para a Ciencia e a Tecnologia (FCT, MCTES) for their general financial support (POCI-PPCDT/QUI/58377/2004) and also for the postdoctoral grants SFRH/BPD/14410/2003 (to L.C.-S.) and SFRH/BPD/9309/2002 (to F.-N.S.). We also wish to thank the EPSRC (UK) and the University of Leeds for equipment funding.