Crystal and molecular structure of di-µ-hydroxo-bis[bipyridylcopper(II)] diperchlorate

Hexa- and polynuclear copper(II) coordination compounds based on the carbonato bridge: Synthesis, crystal structures and magnetic properties

“…The Cu-Cu separation within the dinuclear unit is 2.913(2) Å and the bridging Cu(1)-O(1)-Cu(1)A angle is 96.8(2)°. These features are very close to those observed in the corresponding di-l-hydroxido bridged copper(II) dimers [11][12][13][14]. The di-l-hydroxido-bis(2,2 0 -bipyridine)copper(II) moiety, [Cu (3) (3), respectively.…”

“…The compound 1 also contains six trifluoromethanesulfonate counteranions, two N,N-dimethylformamide (abbreviation as DMF) molecules and nine lattice water [10]. The Cu(3)-Cu(3)A separation of 2.844(2) Å and Cu(3)-O(4)-Cu(3)A bridging angle of 94.3(3)°fall within the range found for similarly coordinated di-l-hydroxidocopper(II) dimers [11][12][13][14]. The environment of central copper atoms are nearly regular square-pyramidal geometry, being coordinated by two nitrogen donors from the bpy ligand and two oxygen atoms from the bridging hydroxido group, forming the CuN 2 O 2 chromophores with distances ranging 1.934(7)-1.997(8) Å , an apical position is occupied by O(1) from the bridging carbonato species at a distance of 2.341(6) Å .…”

Crossover from Antiferromagnetic to Ferromagnetic Exchange Coupling in a New Family of Bis-(μ-phenoxido)dicopper(II) Complexes: A Comprehensive Magneto–Structural Correlation by Experimental and Theoretical Study

“…The nature of the magnetic exchange interactions in phenoxido dinuclear complexes has been largely studied. 14a Thus, there are several parameters affecting the magnitude and sign of the J parameter, such as, the value of Cu–O–Cu angle, the Cu···Cu and Cu–O distances, 41 as well as the distortion of the copper ion geometry, 42 the effect of the asymmetry in the Cu–hydroxo bond, and the out-of-plane displacement of the hydrogen atoms of the hydroxo-bridge. 9 Noticeably, there are only limited examples of phenoxido-bridged dinuclear copper complexes that exhibit ferromagnetic interactions.…”

An efficient method to investigate metal?ligand combinations for oxygen bleaching

“…In alkaline solution, copper complexes with two ligands and complexes with hydroxide-bridged monoligated copper ions may be present [48,[51][52][53][54]. Changes in the metal-ligand ratio and pH affect the equilibrium between these coordinating groups [55].…”