Crystal structures of {[Cu(Lpn)(2)][Fe(CN)(5)(NO)]·H(2)O}(n) and {[Cu(Lpn)(2)](3)[Cr(CN)(6)](2)·5H(2)O}(n) [where Lpn = (R)-propane-1,2-di­amine]: two heterometallic chiral cyanide-bridged coordination polymers

The title compounds, catena-poly[[[bis­[(R)-propane-1,2-di­amine-κ(2) N,N′]copper(II)]-μ-cyanido-κ(2) N:C-[tris­(cyanido-κC)(nitroso-κN)iron(III)]-μ-cyanido-κ(2) C:N] monohydrate], {[Cu(Lpn)(2)][Fe(CN)(5)(NO)]·H(2)O}(n), (I), and poly[[hexa-μ-cyanido-κ(12) C:N-hexa­cyanido-κ(6) C-hexa­kis­[(R)-propane-1,2-di­amine-κ(2) N,N′]dichromium(III)tricopper(II)] penta­hydrate], {[Cu(Lpn)(2)](3)[Cr(CN)(6)](2)·5H(2)O}(n), (II) [where Lpn = (R)-propane-1,2-di­amine, C(3)H(10)N(2)], are new chiral cyanide-bridged bimetallic coordination polymers. The asymmetric unit of compound (I) is composed of two independent cation–anion units of {[Cu(Lpn)(2)][Fe(CN)(5))(NO)]} and two water mol­ecules. The Fe(III) atoms have distorted octa­hedral geometries, while the Cu(II) atoms can be considered to be penta­coordinate. In the crystal, however, the units align to form zigzag cyanide-bridged chains propagating along [101]. Hence, the Cu(II) atoms have distorted octa­hedral coordination spheres with extremely long semicoordination Cu—N(cyanido) bridging bonds. The chains are linked by O—H⋯N and N—H⋯N hydrogen bonds, forming two-dimensional networks parallel to (010), and the networks are linked via N—H⋯O and N—H⋯N hydrogen bonds, forming a three-dimensional framework. Compound (II) is a two-dimensional cyanide-bridged coordination polymer. The asymmetric unit is composed of two chiral {[Cu(Lpn)(2)][Cr(CN)(6)]}(−) anions bridged by a chiral [Cu(Lpn)(2)](2+) cation and five water mol­ecules of crystallization. Both the Cr(III) atoms and the central Cu(II) atom have distorted octa­hedral geometries. The coordination spheres of the outer Cu(II) atoms of the asymmetric unit can be considered to be penta­coordinate. In the crystal, these units are bridged by long semicoordination Cu—N(cyanide) bridging bonds forming a two-dimensional network, hence these Cu(II) atoms now have distorted octa­hedral geometries. The networks, which lie parallel to (10-1), are linked via O—H⋯O, O—H⋯N, N—H⋯O and N—H⋯N hydrogen bonds involving all five non-coordinating water mol­ecules, the cyanide N atoms and the NH(2) groups of the Lpn ligands, forming a three-dimensional framework.