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Mixed‐Ligand Complexes of Copper(II) with α‐Hydroxycarboxylic Acids and 1,10‐Phenanthroline
Author(s) -
Carballo R.,
Covelo B.,
Balboa S.,
Castiñeiras A.,
Niclós J.
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200105)627:5<948::aid-zaac948>3.0.co;2-3
Subject(s) - chemistry , denticity , electron paramagnetic resonance , copper , trigonal bipyramidal molecular geometry , ligand (biochemistry) , medicinal chemistry , crystallography , magnetic susceptibility , dithiocarbamate , stereochemistry , crystal structure , organic chemistry , biochemistry , physics , receptor , nuclear magnetic resonance
Eight new two‐ligand complexes of copper(II) with 1,10‐phenanthroline and one of four different α‐hydroxy‐carboxylic acids (glycolic, lactic, mandelic and benzylic) were prepared. The complexes of general formula [Cu(HL) 2 (phen)] · n H 2 O (HL = monodeprotonated acid) ( 1 – 4 ) were characterized by elemental analysis, IR, electronic and EPR spectroscopy, magnetic measurements and thermo‐gravimetric analysis. The complexes of general formulae [Cu(HL)(phen) 2 ](HL) · H 2 L · n Solv [ 1 a (HL = HGLYO – , n = 1, Solv = MeCN) and 3 a (HL = HMANO – , n = 0)] and [Cu(L)(phen)(OH 2 )] · n H 2 O [ 2 a (L = LACO 2– , n = 4) and 4 a (L = BENO 2– , n = 2)] were characterized by X‐ray diffractometry. In all these latter a pentacoordinated copper atom has a basically square pyramidal coordination polyhedron, the distortion of which towards a trigonal bipyramidal configuration has been evaluated in terms of the parameter τ. In 1 a and 3 a there are three forms of α‐hydroxycarboxylic acid: a monodentate monoanion, a monoanionic counterion, and a neutral molecule lying in the outer coordination sphere; in 2 a and 4 a the α‐hydroxycarboxylic acid is a bidentate dianion coordinating through carboxyl and hydroxyl oxygens.