摘要
Two 1D coordination polymers [Mn(L)(μ 1,5 -dca)(MeOH)] n (ClO 4 ) n (1) and [Mn(L)(μ 1,5 -dca) ] n (PF 6 ) n (2) and a dinuclear compound [Mn 2 (L) 2 (μ 1,5 -dca) 2 (dca) 2 ]×H 2 O (3) [L = N,N′-(bis-(pyridin-2-yl) benzylidene)-ethane-1,2-diamine; dca = dicyanamide] have been isolated using one-pot synthesis of the building components in appropriate molar ratios and characterized. X-ray structural studies reveal that 1 forms a zigzag 1D chain through single Mn-(NCNCN)-Mn units in which each heptacoordinated manganese(II) center adopts a distorted pentagonal bipyramidal geometry with an MnN 6 O chromophore occupied with four N atoms of L, two nitrile N atoms of monobridged μ 1,5 -dca and one O atom of MeOH. In 2, each hexacoordinated metal(II) center has a distorted octahedral coordination environment with an MnN 6 chromophore bound by four N atoms of L and two nitrile N atoms of two different single bridged μ 1,5 -dca units; the latter connects other neighboring metal centers in a non-ending fashion affording a linear 1D chain. Complex 3 is dinuclear where two [Mn(L)] 2+ units are connected by double μ 1,5 -dca bridges with a distorted pentagonal bipyramidal environment. Variable-temperature magnetic susceptibility measurements of 1-3 show weak antiferromagnetic interactions among the metal centers through μ 1,5 -dca bridges. © 2013 Elsevier B.V. All rights reserved.