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Synthesis, Characterisation, Properties and X‐ray Structures of Cu II Coordination Compounds with 5,5′‐Dimethylbipyridine and Various Anions: Control of Stoichiometry and Structure by the Counterions
Author(s) -
van Albada Gerard A.,
Mohamadou Aminou,
Mutikainen Ilpo,
Turpeinen Urho,
Reedijk Jan
Publication year - 2004
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.200400136
Subject(s) - chemistry , crystallography , counterion , trigonal bipyramidal molecular geometry , ligand (biochemistry) , stoichiometry , crystal structure , electron paramagnetic resonance , copper , ion , square pyramidal molecular geometry , inorganic chemistry , organic chemistry , physics , nuclear magnetic resonance , biochemistry , receptor
The synthesis, crystal structures, and electronic and magnetic properties of eight new Cu II compounds containing the ligand 5,5‐dimethyl‐2,2,′‐bipyridine (dmbpy) with the general formula [Cu II (dmbpy) x (L) 2 ] (where L = BF 4 − , CF 3 SO 3 − , NO 3 − , Br − , NCS − , N 3 − , HCOO − , and x = 1−3) are reported. The geometries of the Cu II ions include a four‐coordinate square‐planar polymeric compound [Cu(dmbpy)(N 3 ) 2 ] n ( 7 ), the five‐coordinate compounds, [Cu(dmbpy) 2 (C 2 H 6 O)](CF 3 SO 3 ) 2 ( 2 ), [Cu(dmbpy) 2 (NO 3 )](NO 3 ) ( 3 ), [Cu(dmbpy) 2 (Br)]Br ( 5 ), [Cu(dmbpy)(NCS) 2 ] n ( 6 ) and [Cu(dmbpy) 2 (HCOO)](CF 3 SO 3 ) ( 8 ), which have geometries ranging from square pyramidal to trigonal bipyramidal, and the six‐coordinate compounds [Cu(dmbpy) 3 ](BF 4 ) 2 (C 2 H 6 O) ( 1 ) and [Cu(dmbpy)(NO 3 ) 2 ] ( 4 ), which adopt an octahedrally based geometry. Except for compounds 3 and 4 , with nitrate as the anion, a variation of the copper/ligand ratios in the synthesis has no influence on the stoichiometry. The compounds have been characterised in detail by infrared, ligand field and EPR spectroscopy; the data are consistent with the single‐crystal X‐ray structures. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)