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Structure and Magnetism of a Polycrystalline Transition Metal Soap − Co II [OOC(CH 2 ) 10 COO](H 2 O) 2
Author(s) -
Rueff JeanMichel,
Masciocchi Norberto,
Rabu Pierre,
Sironi Angelo,
Skoulios Antoine
Publication year - 2001
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(200111)2001:11<2843::aid-ejic2843>3.0.co;2-t
Subject(s) - chemistry , crystallography , magnetism , monoclinic crystal system , antiferromagnetism , transition metal , crystal structure , alkyl , stereochemistry , condensed matter physics , organic chemistry , physics , catalysis
Diaquacobalt(II) n ‐dodecane‐α,ω‐dioate ( 2 ) has been synthesized by metathesis of the corresponding potassium soap 1 and has been fully characterized by chemical and spectroscopic analysis. The crystal structure of 2 has been established by X‐ray powder diffraction techniques combined with electron diffraction experiments. It crystallizes in a monoclinic cell [ P 2 1 / a ; a = 9.6558(8), b = 7.4793(6), c = 19.8936(2) Å, β = 95.648(9)°, V = 1429.7(3) Å 3 ; Z = 2] and consists of stacked layers of cobalt(II) ions connected by carboxylato bridges, thus forming chains that extend along the a axis. These layers are separated by alkyl chains arranged quasi‐perpendicularly to the polar sheets. Structure analysis reveals a rare anti ‐ anti conformation of the Co−OCO−Co fragments, which is thought to be responsible for the weak antiferromagnetism of the Co II chains. The exchange coupling constant between the magnetic centres has been estimated as J = −2.08 K.