A spectacular increase in the coercive field with values as high as 1.7 Tesla has been observed in the family of layered molecular magnets A[(MMIII)-M-II(ox)(3)] for the Fe-III/Cr-III mixed metal alloys, where M-II = Mn, Fe, Co, Ni, Cu; M-III = Cr, Fe; ox = oxalate; and A = organic or organometallic cation. In these novel molecular magnets, the transition temperature can be easily tuned by simply varying x, the Fe-III/Cr-III ratio. x was also found to affect the thermal dependence of the magnetic hysteresis for this series, particularly interesting behavior being observed in the iron (II) compounds having x close to 1.