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Structural diversity and magnetic properties of six cobalt coordination polymers based on 2,2'-phosphinico-dibenzoate ligand
Ist Teil von
Dalton transactions : an international journal of inorganic chemistry, 2016-01, Vol.45 (48), p.19500-19510
Ort / Verlag
England
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Six novel Co(ii) coordination polymers, namely, [Co
L
(OH)
(H
O)
]·10.5H
O (1), [Co
L
(3-abpt)
]·4H
O (2), [Co
L
(4-azpy)
(H
O)
(EtOH)] (3), [Co
L
(4,4'-bipy)
(H
O)
(MeCN)] (4), [Co
L
(4,4'-bipy)
] (5), and [Co
L
(OH)
(ina)
(H
O)
] (6) (H
L = 2,2'-phosphinico-dibenzoic acid, 3-abpt = 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole, 4-azpy = 4,4'-azobispyridine, 4,4'-bipy = 4,4'-bipyridine, Hina = isonicotinic acid), have been hydrothermally synthesized and their magnetic properties have been characterized. The L
anion displays six types of coordination modes in the compounds. Compound 1 exhibits a novel 1D ladder-like structure, which consists of non-centrosymmetric Co
units. Compounds 2-4 comprise 2D networks assembled from Co
L
chains and N-heterocyclic linkers. Compound 5 comprises a 3D framework built from six neighboring parallel Co
L
ladders bridged by 4,4'-bipy linkers. Compound 6 features a 3D framework that exhibits pcu topology with the Schläfli symbol of (4
·6
) using a pentanuclear [Co
(OH)
]
cluster as the node. Variable-temperature magnetic susceptibility studies indicate that the six coordination polymers exhibit remarkable magnetic behavior such as spin-canted antiferromagnetism and spin glass, which were found to coexist in compound 6.