Temperature dependent DC magnetic susceptibility measurements were carried out for all crystalline and melt-quenched glass samples, and the variation of effective magnetic moment, μeff (calculated from χM: molar magnetic susceptibility, μ (B.M.) = 2.83√χMT) is plotted as a function of T in Fig. . Room temperature magnetic moments (μRT) for all crystalline phases are as per the number of unpaired spins present in their high spin 'd' orbital configurations. The decrease at low temperatures in all cases demonstrates a contribution of zero-field splitting and a weak antiferromagnetic coupling. Interestingly, the μRT for the glasses were found to be slightly lower than those for the corresponding crystalline phases, indicating a reduction in oxidation state for a proportion of metal centres during melt-quenching (M 2+ → M 0 ). These differences were used to calculate the percentage of metal ions reduced in each case (ag[TBuA][Mn(dca These are Please do not adjust margins Please do not adjust margins lower than the reduction observed in the ag [TPrA][Mn(dca)3] series, which is consistent with their lower Tms and wider temperature range between Tm and Td. Elemental compositions of both crystalline and glassy states were also similar (Table ).