Synthesis, physical properties and structural characterization of .mu.-carbonato-dicopper(II) complexes. 3. Isolation of a racemic crystal form of .mu.-carbonato-dichlorobis(N,N,N',N'-tetramethyl-1,3-propanediamine)dicopper(II) from a substitution reaction of biscarbonatotetrakis[chloro(N,N-diethylnicotinamide)copper(II)]

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