[Cu(oxap)MnL2](ClO4)2 (I) are synthesized and characterized, (H2oxap = N,N'-bis(2-aminopropyl)oxamide; L 1,10-phenanthroline (phen) or 5-nitro-1,10-phenanthroline (NO2-phen)). Variable-temp. (4.2-300 K) magnetic susceptibility measurements were recorded for I. The exchange integral, J, is -74.72 cm-1 for [Cu(oxap)Mn(phen)2](ClO4)2, and -76.39 cm-1 for [Cu(oxap)Mn(NO2-phen)2](ClO4)2, indicating that a moderately strong antiferromagnetic superexchange interaction operates between the metal ions.

Key words: COPPER COMPLEX, PERCHLORATE, DINUCLEAR COMPLEX, MAGNETISM, MANGANESE COMPLEX, LEAST SQUARE METHODS, MAGNETIZATION, PHENANTHROLINE