The coordination of methanol and ethanol molecules was observed in the construction of three 1D coordination polymers composed of anti-anti carboxylato-bridged (Mn3O)-O-III(Brppz)(3) units [Brppz = 3-(5-bromine-2-phenolate) pyrazolate]. The difference in these 1D complexes' structures induced by methanol and ethanol solvents leads to the variation of the magnetic properties. The methanol solvent product 1 [(Mn3O)-O-III(Brppz)(3)(MeOH)(3)(AcO)]center dot 0.5MeOH has a (Mn3O)-O-III repeating unit with two octahedral configuration manganese(III) ions and one square-pyrimid configuration manganese(III) ion, showing a long-range magnetic ordering with a T-c of 8.2 K, whereas the ethanol solvent products 2 [(Mn3O)-O-III(Brppz)(3)(C2H5OH)(4)(AcO)] (alpha-phase) and 3 [(Mn3O)-O-III(Brppz)(3)(C2H5OH)(4)(AcO)] (beta-phase) are polymorphs, both having a (Mn3O)-O-III repeating unit with three octahedral configuration manganese(III) ions, displaying single-chain magnet behaviors. Products 2 and 3 represent the first examples of polymorphs of single-chain magnets. Furthermore, the bridging carboxylate ligand in these 1 D complexes was generated by the decomposition of beta-diketones via the retro-Claisen condensation reactions in the presence of strong bases.