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The asymmetric units of the title compounds, namely, catena -poly[[(1,4,8,11-tetra-aza-cyclo-tetra-decane-κ 4  N  1 , N  4 , N  8 , N  11 )nickel(II)]-μ-1,3-bis-(3-carboxyl-ato-prop-yl)tetra-methyl-disiloxane-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-tetra-aza-cyclo-tetra-decane-κ 4  N  1 , N  4 , N  8 , N  11 )nickel(II)]-μ-4-({[(3-carb-oxy-prop-yl)di-methyl-sil-yl]-oxy}di-methyl-sil-yl)butano-ato-κ 2  O : O '] per-chlorate], {[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 carboxyl-ate in a slightly tetra-gonally distorted trans -NiN 4 O 2 octa-hedral 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 carboxyl-ate O atoms, thus forming a three-dimensional supra-molecular network. In II , each polymeric chain contacts with only two neighbours, forming hydrogen bonds between the partially protonated carb-oxy-lic groups of the bridging ligand. As a result, a lamellar structure is formed with the layers oriented parallel to the (11) plane.

acta crystallographica. section e, crystallographic communications

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

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

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