resumo
Two novel metal pyridylmethylphosphonates, namely, [Co(4-pmp)] (1) and [Cu(4-pmp)(H2O)] (2), (4-pmpH(2) = 4-pyridylmethylphosphonic acid), have been hydrothermally synthesized and characterized by X-ray diffraction, infrared spectroscopy, elemental analysis, and thermogravimetric analysis. In compound 1, each {PO3C} tetrahedron is corner-shared with three {CoNO3} tetrahedra and vice versa, thus forming a one-dimensional (1-D) inorganic chain along the a axis containing 8-membered rings of [(Co-O-P-O)(2)]. The inorganic chains are further connected by a 4-pmp(2-) ligand, generating a 2-D layered structure. Compound 2 displays a three-dimensional (3-D) framework structure, in which the inorganic layers are pillared by the pyridyl groups of the ligand, generating a 3-D pillared-layered structure. The magnetic properties of 1 and 2 have been studied. Compounds 1 and 2 behave as metamagnets at low temperature. The critical fields are about 70 kOe for 1 and 47 kOe for 2 at 1.8 K.
palavras-chave
SINGLE-CHAIN MAGNET; METAL-ORGANIC FRAMEWORK; MOLECULE-MAGNET; PROTON-CONDUCTION; LANTHANIDE PHOSPHONATES; CANTED ANTIFERROMAGNET; WEAK FERROMAGNETISM; RELAXATION; BEHAVIOR; DIPHOSPHONATES
categoria
Chemistry
autores
Yang, TH; Cai, ZS; Shi, FN; Zheng, LM
nossos autores
Fa-Nian Shi
Investigador
Tinghai Yang
Bolseiro de pós-DoutoramentoGrupos
Projectos
agradecimentos
We thank Fundacao para a Ciencia e a Tecnologia (FCT), FEDER, QREN, COMPETE (PEst-C/CTM/LA0011/2013) and (FCT: SFRH/BPD/74582/2010) for financial support. F.-N. Shi acknowledges FCT for the project of PTDC/CTM-NAN/119994/2010. T.-H. Yang acknowledges the NSF of Jiangsu Province (BK20140244), The Project Sponsored by the Scientific Research Foundation for Returned Overseas Chinese Scholars of State Education Ministry, the NSF for Universities in Jiangsu Province (No. 13KJB150013) and the Changzhou Sci&Tech Program (Grant No. CJ20140031).