名称:
catena-Poly[[diaquamanganese(II)]-di-μ-1,1,3,3-tetracyano-2-ethoxypropenido-κ4N1:N3]
摘要:
The crystal structure of the title compound, [Mn(C9H5N4O)(2)(H2O)(2)], conventionally denoted Mn(EtO-TCA)(2)(H2O)(2), where EtO-TCA is 2-ethoxy-1,1,3,3-tetracyanopropenide, is described. The EtO-TCA anions bridge Mn-II centers through one of the nitrile N atoms of each of their two dicyanomethanide groups, thus forming dibridged chains along ab. These chains are linked into two-dimensional sheets through hydrogen bonding. The seven-atom bridge, which results in a long Mn...Mn intrachain interaction [9.0044 (4) Angstrom], as well as the large interchain separations [8.3288 (4) and 8.5220 (4) Angstrom] prohibit long-range magnetic ordering down to temperatures as low as 1.55 K.