Coordination polymer

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

A Co(II) thiocyanato coordination polymer with 4-(3-phenylpropyl)pyridine: the influence of the co-ligand on the magnetic properties

Abstract: Three new coordination compounds with the composition Co(NCS)2(4-(3-phenylpropyl)pyridine)4 (1), Co(NCS)2(4-(3-phenylpropyl)pyridine)4(H2O)2 (2) and [Co(NCS)2(4-(3-phenylpropyl)pyridine)2]n (3) were prepared and investigated. The crystal structures of compounds 1 and 2 consist of discrete complexes, in which the Co(II) cations are coordinated by only terminal N-bonded thiocyanato anions. In the crystal structure of 3 the Co(II) cations are linked into chains by pairs of μ-1,3-bridging thiocyanato anions. DTA-TG measurements on compound 1 show decomposition without the formation of 3 as an intermediate. In contrast, on heating compound 2 two water molecules are removed in the first step leading to the formation of compound 3 in the second step. Magnetic measurements on 3 reveal ferromagnetic interactions between Co(II) ions along chains with J = 29.5(1) K, and also ferromagnetic interactions between chains with zJ′ = 0.38(1) K. The ferromagnetic transition is observed at 3.3 K, which is confirmed by specific heat measurements. The temperature dependent ac susceptibility shows slow relaxations above and below 3.3 K. The results for this quasi-one dimensional Ising ferromagnet, having also some features of a cluster spin-glass, are compared with those of related compounds.

Cupric decamolybdodivanadophosphate. A coordination polymer heterogeneous catalyst for rapid, high conversion, high selectivity sulfoxidation using the ambient environment.

Abstract: A new type of coordination network polymer involving the redox-active polyanion, PV(2)Mo(10)O(40)(5)(-), and bridging -Cu(II)(OH(2))(4)- units, [[(Cu(II)(OH(2))(4))(3)(OH)]PV(2)Mo(10)O(40)](n)() (1), has been characterized by X-ray crystallography and several other methods. It is the first efficient heterogeneous (insoluble) catalyst for selective and rapid sulfoxidation using only the ambient environment (air at room temperature). Catalytic activity is enhanced by soluble nitrate in nontoxic perfluoropolyether (PFPE) media.

Linker stoichiometry-controlled stepwise supramolecular growth of a flexible Cu2Tb single molecule magnet from monomer to dimer to one-dimensional Chain

Abstract: A trinuclear complex [(CuL)2Tb(H2O)(NO3)3]·MeOH·H2O (1) is synthesized by using a metalloligand [CuL] (H2L = N,N′-bis(salicylidene)-1,3-propanediamine or salpn). This complex is used as a new 3d-4f metallatecton for stepwise supramolecular oligomerization along with a simple diimine linker, 4,4′-bipyridine (bpy). A ratio of metallatecton/linker = 2:1 is conducive for the formation of a dimer [{(CuL)2Tb(H2O)(NO3)3}2bpy]·2MeOH·4H2O (2), whereas a higher proportion of linker at a ratio of 1:1 gives rise to a zigzag one-dimensional coordination polymer {[(CuL)2Tb(NO3)3bpy]·MeOH·2H2O}∞ (3). The inherent conformational flexibility of the trinuclear (CuL)2Tb node which is folded (cisoid) for 1 and 2 (asymmetric TbO9 tricapped trigonal prism) and unfolded (transoid) for 3 (a C2-symmetric TbO10 tetradecahedron) seems to stabilize the crystal packing of these coordination-driven self-assemblies. The rapidly saturated magnetization at 1.8 K for 1 (11 μB) and 2 (22 μB) clearly indicates the presence of Tb–Cu ferromag...

Supramolecular Self-Assembly of Zigzag Coordination Polymer Chains: A Fascinating Three-Dimensional Polycatenated Network Featuring an Uneven “Density of Catenations” and a Three-Dimensional Porous Network

Abstract: Reaction of ZnII or CdII nitrate with mixed ligands biphenylethene-4,4‘-dicarboxylate (bpea) and 1,10-phenanthroline (phen) under the same conditions affords two zigzag polymer chains [Zn(bpea)(phen)] (1) and [Cd(bpea)(phen)(H2O)]·H2O (2). The zigzag chains in 1 propagate in two non-coplanar directions (rotated by 73°) that are assembled by supramolecular forces into an intriguing three-dimensional (3D) polycatenated network featuring an uneven “density of catenation” for an individual interlocked component. In 2, however, all the zigzag chains extend in the same direction and are linked to one another by supramolecular forces into a 3D porous network featuring rectangular channels. Thermal stability of the two compounds also was studied in this paper.

Synthesis of One- and Two-Dimensional Coordination Polymers Containing Organotin Macrocycles. Reactions of (n-Bu3Sn)2O with Pyridine Dicarboxylic Acids. Structure-Directing Role of the Ancillary 4,4′-Bipyridine Ligand

Abstract: The reaction of (n-Bu3Sn)2O with pyridine-2,6-dicarboxylic acid (L1H2) in a 1:1 ratio resulted in the formation of a one-dimensional (1D) coordination polymer [(n-Bu3Sn)2(n-Bu2Sn)2(μ-L1)2(μ-OH)2]n (1). The formation of 1 is accompanied by a Sn–butyl bond cleavage reaction involving half of the organotin units. The formation of the 1D coordination polymer is facilitated by the multisite coordination capability of the dianionic ligand L1. The reaction of (n-Bu3Sn)2O with pyridine-2,5-dicarboxylic acid (L2H2) or pyridine-3,5-dicarboxylic acid (L3H2), on the other hand, results in the generation of the two-dimensional (2D) coordination polymers [(n-Bu3Sn)2(μ-L2)]n (2) and [(n-Bu3Sn)4(μ-L3)2]n (3), respectively. The formation of 2 and 3 emphasizes the importance of the relative orientation of the coordinating units in the multisite coordination ligand. Compounds 1–3 show a rich supramolecular architecture in their solid state as a result of multiple secondary interactions. Investigation of the fate of the reac...