New mixed-ligand copper(II) complex with iminodiacetate and imidazole: Bis[bis(imidazole)(iminodiacetato)copper(II)] dihydrate

Reversible Coordinative Bonds in Molecular Recognition

“…Cu(II) complexes of IDA ([Cu(IDA)(H 2 O) 2 ]) form polymeric structures in the solid state. , The Cu(II) ion coordination geometry is a distorted octahedron. 27 A large variety of complexes with IDA, − N-IDA, ,, or C-IDA , derivatives as primary chelating agent and imidazoles 34-37,41 as an additional ligand have been studied. The investigation of their structures in the solid state gave several interesting correlations: In compounds prepared from equimolar amounts of Cu(II), IDA, and N-heterocyclic donor, the Cu(II) exhibits a distorted pyramidal coordination (type 4+1) or, in some cases, an octahedral coordination geometry (type 4+2 or 4+1+1) is adopted .…”

Synthesis, Structure, and Properties of a Tetrametallic Ferrocenecarboxylato-Bridged Copper(II) Complex

“…Dinuclear copper(II) complexes have been early studied as useful models to establish magnetostructural correlations for spin exchange between metal ions. − Among them, copper(II) carboxylate adducts are one of the most extensively studied systems due to the limited variations observed in their tetrabridged [Cu 2 (μ-OOCR) 4 L 2 ] cagelike core (Chart , I ) when R and/or L are changed. − However, doubly O , O ‘-carboxylato-bridged dicopper(II) systems of magnetic and/or biological interest − are less common and most of them can be visualized as derived from the [Cu 2 (μ-OOCR) 4 ] fragment either by replacement of two bridging carboxylato ligands by one monodentate O-donor group, giving [Cu 2 (μ-OOCR) 2 (μ-OR‘)] m + species or by the incorporation of N-donor groups, producing [Cu 2 (μ-OOCR) 2 (NR‘‘) y ] m + cores. − In the latter case, when the ligands are aromatic bidentate N-heterocycles, they tend to ocupy the basal positions of the square-pyramidal copper(II) environments (Chart , II ):

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Co-ordination behaviour of N-carboxymethylpseudoephedrine: crystal structures of seven-co-ordinated cadmium(II) and fac-RS-octahedral copper(II) complexes

“…The apical positions are occupied by a water molecule and a chloride ion, Cl᎐Cd᎐O(1) 169.6(3)Њ. As observed in 5, the tridentate cpse ligand lies in the equatorial plane, Cd᎐O(3) 2.323(9), Cd᎐N(1) 2.437 (12) and Cd᎐O(4) 2.360(10) Å, however the co-ordination sphere is completed by a chelated carboxylic group from another cpse ligand, Cd᎐O(2A) 2.410 (11) and Cd᎐O(3A) 2.500(10) Å. Each carboxylate group of cpse is bridging two different cadmium atoms, as in Cd(O 2 CMe) 2 (H 2 O) 2 , 27 forming a zigzag chain structure as depicted in Fig.…”