Syntheses and crystal structures of the one-dimensional coordination polymers formed by [Ni(cyclam)](2+) cations and 1,3-bis­(3-carb­oxy­prop­yl)tetra­methyl­disiloxane anions in different degrees of deprotonation

The asymmetric units of the title compounds, namely, catena-poly[[(1,4,8,11-tetra­aza­cyclo­tetra­decane-κ(4) N (1),N (4),N (8),N (11))nickel(II)]-μ-1,3-bis­(3-carboxyl­ato­prop­yl)tetra­methyl­disiloxane-κ(2) O:O′], [Ni(C(10)H(24)O(5)Si(2))(C(12)H(24)N(4))](n) (I), and catena-poly[[[(1,4,8,11-tetra­aza­cyclo­tetra­decane-κ(4) N (1),N (4),N (8),N (11))nickel(II)]-μ-4-({[(3-carb­oxy­prop­yl)di­methyl­sil­yl]­oxy}di­methyl­sil­yl)butano­ato-κ(2) O:O′] per­chlorate], {[Ni(C(10)H(25)O(5)Si(2))(C(12)H(24)N(4))]ClO(4)}(n) (II), consist of one (in I) or two crystallographically non-equivalent (in II) centrosymmetric macrocyclic cations and one centrosymmetric dianion (in I) or two centrosymmetric monoanions (in II). In each compound, the metal ion is coordinated by the four secondary N atoms of the macrocyclic ligand, which adopts the most energetically stable trans-III conformation, and the mutually trans O atoms of the carboxyl­ate in a slightly tetra­gonally distorted trans-NiN(4)O(2) octa­hedral coordination geometry. The crystals of both types of compounds are composed of parallel polymeric chains of the macrocyclic cations linked by the anions of the acid running along the [101] and [110] directions in I and II, respectively. In I, each polymeric chain is linked to four neighbouring ones by hydrogen bonding between the NH groups of the macrocycle and the carboxyl­ate O atoms, thus forming a three-dimensional supra­molecular network. In II, each polymeric chain contacts with only two neighbours, forming hydrogen bonds between the partially protonated carb­oxy­lic groups of the bridging ligand. As a result, a lamellar structure is formed with the layers oriented parallel to the (1[Image: see text]1) plane.