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2D Coordination Polymer Built from Lithium Dimethylmalonate and Co II Ions: The Influence of Dehydration on Spectral and Magnetic Properties
Author(s) -
ZorinaTikhonova Ekateri.,
Gogoleva Natalya V.,
Sidorov Aleksei A.,
Kiskin Mikhail A.,
Kolotilov Sergey V.,
Ivanova Tatiana M.,
Maslakov Konstantin I.,
Dobrokhotova Zhanna V.,
Efimov Nikolay N.,
Novotortsev Vladimir M.,
Eremenko Igor L.
Publication year - 2017
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/ejic.201601376
Subject(s) - chemistry , molecule , octahedron , ion , magnetic susceptibility , crystallography , cobalt , dehydration , coordination polymer , lithium (medication) , magnetism , amorphous solid , polymer , atmospheric temperature range , inorganic chemistry , metal ions in aqueous solution , crystal structure , thermodynamics , organic chemistry , medicine , biochemistry , endocrinology , physics , quantum mechanics
2D coordination polymer [Li 2 Co(H 2 O) 4 (Me 2 Mal) 2 ] n ( 1 ) was synthesized by interaction of lithium dimethylmalonate (Li 2 Me 2 mal) and cobalt(II) acetate. The structure of 1 can be described as {Li(H 2 O) 2 (Me 2 Mal‐κ‐ O , O′ )} anions linked by Co II cations through bridging water molecules and Me 2 Mal 2– dianions. Upon heating to 130–190 °C, compound 1 loses water molecules and transforms into [Li 2 Co(Me 2 Mal) 2 ] n ( 2 ). Compound 2 is non‐porous and amorphous, its rehydration by water leads to formation of 1 , as shown by powder XRD. Dehydration of 1 is associated with a drastic color change from pink to violet. The temperature dependency of magnetic susceptibility χ M for 1 in the range 2–300 K was analyzed by using a model, which takes into account spin–orbit coupling in Co II and exchange interactions as a molecular field. Transformation 1 → 2 leads to less than 6 % change of χ M T in the temperature range 2–300 K; this small change of magnetic susceptibility is consistent with conclusions that most of the Co II ions in 2 are in pseudo‐octahedral donor sets. Analysis of the χ M T versus T curve for 2 was performed by using three models, which consider magnetism of uniform Co II ions or the co‐existence of Co II species in different donor sets.