Tetrakis(μ-2,6-difluorobenzoato-κ²O:O′)bis[aquacopper(II)]

Abstract

The title complex, [Cu2(C7H3F2O2)4(H2O)2], has a centrosymmetric dinuclear structure in which two symmetry‐related CuII centers are bridged by four carboxyl­ate groups of distinct 2,6‐difluoro­benzoate ligands, the Cu⋯Cu separation being 2.6139 (2) Å. Each CuII center is five‐coordinated by four O atoms of carboxyl­ate groups in the basal plane and the O atom of a water mol­ecule in the apical position.

Synthesis and characterization of Cu(II) paddlewheel complexes possessing fluorinated carboxylate ligands

“…The distorted octahedral geometry is completed by a Cu-Cu interaction, and by solvent ligands bound at the axial position (1-4) or by carboxylate oxygens from an adjoining copper dimer (6). [21], and as expected, are found to be shorter than the Cu-O solv distances (1: 2.126(3) Å´; 2: average = 2.142(7) Å´; 3: 2.141(2) Å´ [25]). Kariprdes and White report that the copper(II) 2,6-difluorobenzoate species (Cu 2 (C 6 H 4 F 2 ) 4 (H 2 O) 2 ) [22] has a C-FÁ Á ÁH-O water distance of 2.962 Å´, which they describe as the shortest known organic hydrogen bond of its kind.…”

“…Kariprdes and White report that the copper(II) 2,6-difluorobenzoate species (Cu 2 (C 6 H 4 F 2 ) 4 (H 2 O) 2 ) [22] has a C-FÁ Á ÁH-O water distance of 2.962 Å´, which they describe as the shortest known organic hydrogen bond of its kind. Lim et al found the same compound showed a C-FÁ Á ÁH-O water distance of 2.928 Å [ 21]. Compound 1 shows a C-FÁ Á ÁH-O MeOH interatomic distance of 2.955 Å´, intermediate of these two previous distances.…”

Synthesis, characterization, antioxidant, antileishmanial, anticancer, DNA and theoretical SARS-CoV-2 interaction studies of copper(II) carboxylate complexes

“…The apical nitrogen donor ligands normally saturate the coordination spheres of the copper centers and thereby result in the commonly observed discrete di-nuclear molecular units [2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] . Less common polymeric paddlewheel structures may result in cases where carboxylates act as bridging bidentate ligands in the apical positions [18] , [19] , [20] , [21] , [22] , [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] . The formation of di- or polymeric structures may be attributed mainly to both steric as well as electronic effects of the employed ligands.…”