Coordination polymer

About: Coordination polymer is a research topic. Over the lifetime, 11988 publications have been published within this topic receiving 212219 citations.

CO adsorption on cpo-27-ni coordination polymer: spectroscopic features and interaction energy

Abstract: The microporous metal−organic framework Ni2(dhtp) (H4dhtp = 2,5-dihydroxyterephtalic acid) is a 3D network that maintains crystallinity and porosity after solvent removal. A mild thermal treatment in high vacuo at 393 K removes completely water allowing to obtain a MOF material with honeycomb structure able to strongly coordinate CO at room temperature. In this contribution, the reactivity toward CO of CPO-27-Ni has been studied by the combined use of infrared, extended X-ray absorption fine structure, X-ray absorption near edge structure, and UV−vis spectropies and microcalorimetry. Most of the Ni2+ sites are involved in the interaction (about 80%), forming 1:1 linear adducts whose interaction enthalpy is slightly above 50 kJ/mol. In the presence of CO, a large modification of the vibrational and electronic properties of the material with respect to the dehydrated one has been observed.

An Aqua-Soluble Copper(II)−Sodium Two-Dimensional Coordination Polymer with Intercalated Infinite Chains of Decameric Water Clusters

Abstract: Self-assembly synthesis in water, at room temperature, with dinuclear copper triethanolaminate and aqua−sodium building blocks as well as benzene-1,2,4,5-tetracarboxylate linkers leads to the formation of an heteronuclear Cu−Na assembly with a two-dimensional metal−organic framework, providing the first example of an aqua-soluble copper-containing coordination polymer that hosts infinite chains of decameric water clusters (H2O)10 formed by quasiplanar cyclic water octamers with two pendent water molecules.

Octadecanuclear Cluster or 1D Polymer with [{ML}2Nb(CN)8]n Motifs as a Function of {ML} (M = Ni(II), n = 6; M = Mn(II), n = ∞; L = Macrocycle)

Abstract: A nanosized octadecaheteronuclear aggregate, [{NiL2}12{Nb(CN)8}6(H2O)6], and a 1-D coordination polymer, [{MnL1}2{Nb(CN)8}(H2O)]∞, have been obtained by self-assembly between the octacyanometalate {Nb(CN)8}4- and {ML}2+ complexes. The dimensionality of the supramolecular architectures was found to be controlled by the {ML} module for which the equatorial coordination sites are blocked by a macrocyclic ligand. The crystal structures and magnetic properties for both the compounds are described.

Coordination polymers of d10 metals and N,N'-bis(3-pyridinecarboxamide)-1,2-ethane

Abstract: The ligands N,N′-bis(3-pyridinecarboxamide)-1,2-ethane (L) was designed to form coordination polymers capable of assembling into 2-D network via complementary amide hydrogen bonds. The reactions of L with AgX (X = ClO4−, CF3SO3− or NO3−), Zn(ClO4)2·6H2O and Cd(ClO4)2·6H2O produced coordination polymers 1–5,the structures of which were characterized by single crystal X-ray diffraction. The polymer {[AgL][ClO4]}∞ crystallized in two polymorphs 1A and 1B which consisted of coordination polymers {[AgL]+}∞ in sine-wave and zigzag conformations, respectively. In addition, the X-ray crystal structures of {[AgL][CF3SO3]}∞ (2) and {[AgL][NO3](H2O)1.25}∞ (3) showed coordination polymers in zigzag conformation similar to that of 1B. The polymers in compounds 1, 2 and 3 aggregate via complementary amide hydrogen bonds, forming corrugated sheets in the solid state. Furthermore, the compound trans-{[ZnL2(H2O)2][ClO4]2·(H2O)2·CH3CN}∞ (4) was shown to be an infinite chain of [Zn2L2] metallacycles. The stacking of the Zn polymer leads to the formation of a channel-like structure. The coordination polymer {[CdL(H2O)3][ClO4]2}∞ (5) shows zigzag chains which are linked through hydrogen bonds between the anion, amide groups and coordinated water molecules. In contrast to its isomer L, the ligand N,N′-bis(2-pyridinecarboxamide)-1,2-ethane (L1) formed segregated Ag(I) coordination polymer (6) in which the Ag ion is four coordinate.