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Synthesis, Crystal Structure and Magnetic Properties of the Helical‐Chain Compounds [M 2 (O 2 CC 12 H 8 CO 2 ) 2 (H 2 O) 8 ] [M = Cobalt(II), Nickel(II)]
Author(s) -
Rueff JeanMichel,
Pillet Sébastien,
Claiser Nicolas,
Bonaventure Gautier,
Souhassou Mohamed,
Rabu Pierre
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200203)2002:4<895::aid-ejic895>3.0.co;2-z
Subject(s) - chemistry , isostructural , nickel , crystallography , cobalt , octahedron , transition metal , crystal structure , ferromagnetism , hydrothermal circulation , magnetic susceptibility , biphenyl , chain (unit) , hydrothermal synthesis , inorganic chemistry , stereochemistry , catalysis , organic chemistry , physics , seismology , geology , quantum mechanics , astronomy
New 1D complexes are obtained from the reaction of 1,1′‐biphenyl‐2,2′‐dicarboxylic acid (diphenic acid) with KOH and [Co(NO 3 ) 2 ·6H 2 O] or [Ni(NO 3 ) 2 ·6H 2 O] under hydrothermal conditions. Compounds 1 and 2 are isostructural and their structure consists of stacked helical chains of octahedral metal(II) ions. Magnetic measurements show that the Co II atoms in compound 1 are quasi‐isolated. In compound 2 , the Ni II chains exhibit a ferromagnetic behaviour. From a simple model derived from the scaling theory of phase transition, the exchange coupling between neighbouring Ni II atoms is evaluated at J = +1.06 K. A zero‐field splitting effect is observed below 16 K.