Infinite molecular tubes: structure and magnetism of M(dca)(2)(apym) [M = Co, Ni, apym=2-aminopyrimidine, dca = dicyanamide, N(CN)(2)(-)]

The title compounds have a molecular tube-like structure topologically related to the alpha-M(dca)(2) rutile structure, and display unusual field-dependent magnetic moments at low temperature but without long-range order.