Abstract
The reaction of copper(II) and cobalt(II) oxinates ( MOx 2; HOx = oxine) with haloacetic acids ( RCO 2H; R = CH 2Cl, CHCl 2, CCl 3 and CF 3) in benzene produces four types of mixed ligand complexes. These types are formulated as (a) MOx(HOx)( RCO 2); for M = Cu(II), R = CHCl 2, and for M = Co(II), R = CH 2Cl, CHCl 2, (b) MOx( RCO 2), for M = Cu(II), R = CCl 3, and for M = Co(II), R = CH 2Cl, CHCl 2, (c) M(HOx) 2( RCO 2) 2; for M = Cu(II) R = CH 2Cl and for M = Co(II), R = CCl 3, and (d) MOx(HOx)(CF 3CO 2) n MOx· zH 2O; for M = Cu(II), n = 2, z = 0, and for M = Co(II), n = 1 or 2 and z = 1 or 2 respectively. The formation of the triatomic system +N-H … O in the metal complexes of types (a), (c) and (d), with a zwitterion oxine molecule (HOx) coordinated through its phenolic oxygen, is suggested on spectroscopic evidence. This is compared with the additional oxine molecule in some metal oxinates. The factors that control the formation of these metal complexes are discussed.
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