Low-dimensional compounds containing cyano groups. VI. A unique two- and one-dimensional structure in amminebis(1,4-diaminobutane)tetrakis[dicyanoargentato(I)]dicopper(II) dihydrate.
The title compound, [Cu(2)(C(4)H(12)N(2))(2)(Ag(CN)(2))(4)(NH(3))].2H(2)O or [Ag(4)Cu(2)(CN)(8)(C(4)H(12)N(2))(2)(NH(3))].2H(2)O, contains two crystallographically different Cu(II) atoms lying on twofold axes. The first Cu atom is hexacoordinated in the form of an elongated tetragonal bipyramid and is part of a plane in which Cu atoms are connected by two bridging diaminobutane molecules [Cu-N = 2.033 (4) A] and two dicyanoargentate anions [Cu-N = 2.622 (6) A]. The ammine ligand stands perpendicular to this plane [Cu-N = 2.011 (6) A] in a trans position to it. Another [Ag(CN)(2)](-) anion connects the hexacoordinated Cu atom [Cu-N = 1.997 (8) A] with the second Cu atom [Cu-N = 2.026 (7) A], which is pentacoordinated in the form of a slightly distorted trigonal bipyramid by two monodentate dicyanoargetate anions [Cu-N = 2.040 (5) A]. The axial positions are occupied by two bridging diaminobutane molecules [Cu-N = 2.011 (4) A] that connect the Cu atoms into chains parallel to the above plane. The water molecules remain uncoordinated and thus a unique combination of two- and one-dimensional structures is formed.
Potocnák
Ivan
I
Department of Inorganic Chemistry, Faculty of Science, P. J. Safárik University, Moyzesova 11, SK-041 54 Kosice, Slovakia. potocnak@kosice.upjs.sk
Triscíková
Lubica
L
Wagner
Christoph
C