Influence of the Aromatic Ligand Nature and Synthesis Conditions on the Structures of the Copper Pentafluorobenzoate Complexes

Abstract

New pentafluorobenzoate (Рfb) copper complexes with 2,3- and 3,5-lutidine (2,3- and 3,5-Lut, respectively), quinoline (Quin), and 1,10-phenanthroline (Рhen) ([Cu2(MeCN)2(Рfb)4] (I), [Cu(2,3-Lut)2(Pfb)2] (II), [Cu(3,5-Lut)4(Pfb)2] (III), [Cu(Quin)2(Pfb)2] (IV), and [Cu2(Phen)2(Pfb)4] (V)) are synthesized by the newly developed methods and characterized. The unusual heteroanionic pentafluorobenzoate benzoate (Вnz) ionic compound [Cu2(Рhen)2(Рfb)3]+(Рnz)– (VI) is synthesized. It is shown that the four-bridge binuclear metal cage of complex I is not retained in the reactions with various pyridine derivatives. In the case of such α-substituted pyridines as 2,3-lutidine and quinoline, the compositions and structures of the final products of the reactions with copper pentafluorobenzoate are independent of the initial ratio of the reagents and crystallization conditions. It is revealed by the Hirshfeld surface analysis that π···π, C–F···π, C–H···F, and F···F interactions make the major contribution to the stabilization of crystal packings of the synthesized complexes.