Layer polymeric Cu(II) complexes with enaminoketone derivatives of 3-imidazoline nitroxide. First structurally defined CuBr2 complex with imidazoline zwitterion

Crystal stmctures of two layer polymeric hetcrospin complexes Cu(L^Hal,R )₂ , where L are deprotonated enaminoketone derivatives of a stable radical 3-imidazoline nitroxide (Hal = Cl, R = CF₃ and Hal = Br, R = COOC₂H₅), are described. In the solid state, both compounds have a layer polymeric structure with Cu(11) ions coordinating the O atoms of the nitroxyl groups of the neighboring molecules. The stmcture of the product of decomposition of Cu(L^Br,COOC ₂H_{5 2} — Cu(L′)₂Br₂ · 2H₂O—which is a rare example of a complex with a coordinated zwitterion (4-carboxy-2,255-tetramethyl-3-imidazoline zwitterion), is analyzed. Translated fromZhumal Struktunoi Khimii, Vol. 41, No. 2, pp. 349–358, March–April, 2(XX).