Manecke and Gauger found in 1967 that the bisaminosquaraincs withphenyl substituents containing donor groups in o-position could formcomplexes with Cu^(2+),Ag^+ and UO_2^(2+) However,few work in this field hasbeen reported ever since.The dioxocyclobutene ring in squaralnes has two negatively charged oxygenswhich may serve as good donor atoms,thus the multidentate ligands containingthis characteristic hydrophilic moiety are supposed to partake of some
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