resumo
The coordination compounds [Ni(mu-mal)(apy)(2)(H2O)]center dot 2.8H(2)O (1), [Mn(mu-mal)(H2O)(2)] (2), (apyH)(2)[Cu(mu-mal)(2)] (3) and (apyH)(2)[Co(mal)(2)(H2O)(2)] (4) (mal = malonate, apy = p-aminopyridine) have been synthesized and characterized by elemental analysis, vibrational spectroscopy, single crystal X-ray diffraction and magnetometry. With exception of 4, the malonate group acts as bridging ligand leading to the formation of one-dimensional polymeric chains. In compound 1 it was observed the coordination of the p-aminopyridine in the axial positions of the distorted octahedral coordination sphere. The solid-state structure exhibits a high complex 3D network formed by several supramolecular interactions. Magnetic properties were determined for all members of the series and indicate that the materials behave are normal paramagnets, except the Mn polymer 2 which exhibits an antiferromagnetic ground state. (C) 2013 Elsevier Ltd. All rights reserved.
palavras-chave
METAL-ORGANIC FRAMEWORKS; COPPER(II) COMPLEX; CRYSTAL-STRUCTURES; COORDINATION; DESIGN; 4-AMINOPYRIDINE; CHEMISTRY; PATTERNS; NI(II); LIGAND
categoria
Chemistry; Crystallography
autores
Fernandes, RJ; Frem, RCG; da Silva, PB; Freitas, RS; Silva, P; Fernandes, JA; Rocha, J; Paz, FAA
nossos autores
Filipe Alexandre Almeida Paz
Investigador Principal
João Rocha
Prof. Catedrático
José Alberto Pires Fernandes
Bolseiro de pós-Doutoramentoagradecimentos
The corresponding author thanks Prof. Luis D. Carlos of University of Aveiro, Department of Physics, CICECO, Aveiro-Portugal. The authors are grateful to Capes, CNPq and Fapesp for the financial support. Some of the authors are grateful to Fundacao para a Ciencia e a Tecnologia (FCT, Portugal), FEDER and COMPETE for the financial support towards the purchase of the single-crystal diffractometer, for the post-doctoral research grant No. SFRH/BPD/63736/2009 (to JAF), the Ph.D. scholarship No. SFRH/BD/46601/2008 (to PS) and for their funds towards the R&D project PTDC/QUI-QUI/098098/2088 (FCOMP-01-0124-FEDER-010785).