Showing papers on "Coordination polymer published in 1997"
436 citations
TL;DR: In this paper, the conformationally flexible bidentate ligand 1,3-bis(4-pyridyl)propane (bpp) was obtained from Ag(CF3SO3) and three 1D coordination polymers.
Abstract: Three 1D coordination polymers were obtained from Ag(CF3SO3) and the conformationally flexible bidentate ligand 1,3-bis(4-pyridyl)propane (bpp), [Ag(bpp)](CF3SO3)·EtOH (1), [Ag(bpp)](CF3SO3) (2), and [Ag2(bpp)4](CF3SO3)2·bpp (3), the latter two exhibiting quite uncommon structural motifs. 2 contains an infinite double helical polymer, comprised of two chains of the type present in 1, and is the first example of a cationic infinite discrete double helix in coordination polymer chemistry. 3 contains a novel 1D polymer, comprised of interconnected macrocycles to give an infinite tubular shape. Uncoordinated bpp molecules are located inside the tubules, threading the rings in a pseudorotaxane-like manner.
265 citations
119 citations
TL;DR: In this article, a pseudorotaxane was created by threading a cucurbituril bead with a N,N′-bis(3-pyridylmethyl)-1,4-diaminopentane string.
110 citations
81 citations
TL;DR: In this article, the use of three dicyanobenzene derivatives as bridging ligands was used to synthesize four copper coordination polymers, [Cu(dchq)2]-ClO4)(Me2CO)2 (1; dchq = 1,2-dicyanohydroquinone), [Cu[ipn]2]-PF6)(Me 2CO) (2; ipn = 1.3-dimethylterephthalonitrile), and [cu(dmtpn)2](X)(dmt
Abstract: With the use of three dicyanobenzene derivatives as bridging ligands, four copper(I) coordination polymers, [Cu(dchq)2](ClO4)(Me2CO)2 (1; dchq = 1,2-dicyanohydroquinone), [Cu(ipn)2](PF6)(Me2CO) (2; ipn = 1,3-dicyanobenzene), and [Cu(dmtpn)2](X)(dmtpn)(THF) (3a (X = BF4), 3b (X = ClO4); dmtpn = 2,5-dimethylterephthalonitrile) were synthesized and characterized. Single-crystal X-ray analyses revealed that all copper(I) ions in these complexes have tetrahedral geometry and are coordinated by four ligands which also coordinate to the next copper ions, resulting in the formation of coordination polymer compounds. The polymer framework of 1 consists of one-dimensional chains that run along the a-axis direction and weakly interact with each other through π−π interactions between the dchq molecules and through hydrogen bonding. 2 has a two-dimensional sheet with a square arrangement of copper(I) ions. Stacking of the square lattice in the c-axis direction forms cavities in which the acetone molecules and PF6- ani...
72 citations
TL;DR: In this article, the synthesis and characterization of the copper(II) complex [Cu(bim)2.5]-ClO4)2·2MeOH, where bim=1,2-bis(imidazol-1′-yl)ethane, is described.
59 citations
TL;DR: In this article, four polymeric lanthanide(III) complexes of two new double betaine derivatives have been synthesized and structurally determined, and the properties of these complexes are discussed.
48 citations
TL;DR: In this paper, the synthesis, properties and the molecular structure in the solid state of triazido(tripyridino)indium are reported, with special emphasis on the aspect of the accessible chemical purity of the precursors.
44 citations
TL;DR: The reaction of 2,5-bis(2-pyridyl)pyrazine (bppz) with nickel(II) sulfate in aqueous solution yielded a binuclear complex, [Ni(2)( bppz)(H(2)O)(8)](SO(4))(2), whose structure was solved by single-crystal methods.
Abstract: The reaction of 2,5-bis(2-pyridyl)pyrazine (bppz) with nickel(II) sulfate in aqueous solution yielded a binuclear complex, [Ni(2)(bppz)(H(2)O)(8)](SO(4))(2).2H(2)O (1), whose structure was solved by single-crystal methods. The compound crystallizes in the monoclinic space group P2(1)/n with a = 8.372(2) A, b = 18.301(2) A, c = 17.197(2) A, beta = 97.54(2) degrees, and Z = 4. The bppz ligand chelates the two octahedrally coordinated nickel atoms through its nitrogen donors. The four remaining coordination sites are occupied by water oxygen atoms. The binuclear [Ni(2)(bppz)(H(2)O)(8)](4+) cations are held together by hydrogen bonds involving sulfate anions and water molecules. Similar reactions with nickel(II) or copper(II) chloride in less polar solvents resulted in the formation of two new coordination polymers, {[Ni(2)Cl(2)(bppz)(H(2)O)(2)(CH(3)OH)(2)]Cl(2)}(n)() (2) and [Cu(2)Cl(4)(bppz)](n)() (3). These polymers could be obtained only in microcrystalline form. Their structures were determined ab initio from X-ray powder diffraction data. The complex {[Ni(2)Cl(2)(bppz)(H(2)O)(2)(CH(3)OH)(2)]Cl(2)}(n)() (2) belongs to the triclinic space group Po with a = 8.7014(4) A, b = 10.1465(5) A, c = 8.0303(3) A, alpha = 116.095(2) degrees, beta = 112.713(3) degrees, gamma = 64.056(3) degrees, and Z = 1. The octahedral coordination of the nickel atom is achieved by two nitrogens of the ligand bppz, two chloride ions, and two oxygens from the solvent molecules. The bridging nature of the chloride ions and the bis-bidentate ligands (bppz) leads to a one-dimensional polymer. The compound [Cu(2)Cl(4)(bppz)](n)() (3) crystallizes in the monoclinic space group C2/m with a = 13.9124(5) A, b = 6.1844(2) A, c = 10.1572(3) A, beta = 112.952(3) degrees, and Z = 2. The copper atoms display a distorted octahedral geometry where four of the coordination sites are occupied by chloride ions and the remaining two by nitrogen atoms of bppz. The metal atoms are bridged by two chlorine atoms and the bppz ligands, forming a two-dimensional coordination polymer.
37 citations
TL;DR: A title compound has been synthesized and characterized in this paper, which consists of onedimensional chains of copper(II) ions bridged by pyrazine-2,3-dicarboxylate.
TL;DR: The first metal complex of TTF or BEDT-TTF analogs, in which the sulfur atom in a five- or six-membered ring directly coordinates to the silver ion, was synthesized and the molecular structure and packing were characterized crystallographically as mentioned in this paper.
TL;DR: The coordination polymer (Me3SnIV)3RhIII(SCN)6] = [Rh{μ-(SCNSnMe3NCS)3] (5) is readily accessible by straightforward self-assembly of [Rh 6]3 and [Me 3Sn} ions as mentioned in this paper.
Abstract: The new coordination polymer [(Me3SnIV)3RhIII(SCN)6] = [Rh{μ-(SCNSnMe3NCS)}3] (5) is readily accessible by straightforward self-assembly of [Rh(SCN)6]3- and (dehydrated) {Me3Sn} ions. The architecture of 5 is strongly reminiscent of “super-Prussian-blue” systems reported earlier: there is a three-dimensional (3-D) framework involving {Rh8} pseudocubes as the basic building blocks, the Rh3+ ions being held apart by novel, nonlinear {SCN-SnMe3-NCS} spacers (d(Rh…Rh) = 1.27 nm). The complete lattice consists of two equivalent and independent, ideally interwoven 3-D frameworks. Three homologues of 5 with slightly modified R3Sn units (R = Et, nPr and nBu) have been prepared as well, but display X-ray powder diffraction patterns notably different from that of 5.
TL;DR: The reaction of the methyl ester of pyrazine-2,3-dicarboxylic acid with CuCl2 leads to the formation of a new coordination polymer, [Cu(C7H5N2O4)]n.
Abstract: The reaction of the methyl ester of pyrazine-2,3-dicarboxylic acid with CuCl2 leads to the formation of a new coordination polymer, [Cu(C7H5N2O4)]n. Partial metal-catalyzed hydrolysis of the organi...
TL;DR: Coordination compounds derived from 1,1′-bis(N-formyl-N′-substituted thiourea) derivatives have been prepared and elemental analyses indicate the presence of a 1:1 metal-to-ligand ratio as mentioned in this paper.
Abstract: Coordination compounds derived from 1,1′-bis(N-formyl-N′-substituted thiourea)ferrocene derivatives have been prepared Elemental analyses indicate the presence of a 1:1 metal-to-ligand ratio Ir and 1H-nmr spectra show that the intramolecular hydrogen bonds in the corresponding ligands remain intact upon coordination The single crystal structure of one such compound, a coordination polymer, was determined CuII was reduced to CuI during the coordination process
TL;DR: In this article, the reaction of CuBr2 with 2-amino-5-bromopyrimidine and HBr in aqueous solution gave as the major product (2amino5bromopeyridine)bromocopper(I) (1) in 58% isolated yield.
Abstract: The reaction of CuBr2 with 2-amino-5-bromopyrimidine and HBr in aqueous solution gave as the major product (2-amino-5-bromopyrimidine)bromocopper(I) (1) in 58% isolated yield. Compound 1 crystallizes as small orange blocks in the rare space group 14mm. Crystal data for 1 are: tetragonal. space group: 14mm, a = b= 15.646(3), c = 6.705(3) A, V = 1641.3(8) A3 Z = 8. Dcale = 2.634 Mg/m3, μ = 12.334 mm−1, F(OOO) =1216, MoKa (λ. = 0.71073 A˚). R = 0.0322 for [|I| 2σ(I)] and R = 0.0420 for all 343 unique reflections and 70 parameters. The structure exists as a firee-dimensional coordination polymer with sheets of pyrimidine bridged copper atoms, parallel to the ab-crystal plane, bridged by bromine atoms roughly parallel to the c-axis.
TL;DR: Two linear coordination polymers composed of copper(I) cations and tetrakis(ethylthio)tetrathiafulvalene (TTC2-TTF) as discussed by the authors have been synthesized by the reaction of copper tetrafluoroborate with TTC2-tTF and copper perchlorate with TTC3-T TF in acetone under argon.
TL;DR: Two zinc(II) complexes containing a flexible double betaine, namely [{Zn(L)Br2}n]·nH2O (1) and [Zn[L]Br2]n], have been prepared and shown to have polymeric structures by single-crystal X-ray analysis as discussed by the authors.
Abstract: Two zinc(II) complexes containing a flexible double betaine, namely [{Zn(L)Br2}n]·nH2O (1) and [{Zn(L)2(H2O)2}n](ClO4)2n·4nH2O (2) [L=1,4-diazoniabicyclo [2.2.2]octane-1,4-diacetate,−O2CCH2N+(CH2CH2)3N+CH2CO2−], have been prepared and shown to have polymeric structures by single-crystal X-ray analysis. Complex (1) exhibits an infinite zigzag chain in which each zinc(II) atom is coordinated by two unidentate carboxylate oxygen atoms and two bromide ligands in a distorted tetrahedral geometry. Complex (2) consists of an assembly of catonic Zn(L)2(H2O)22+ moieties and discrete perchlorate anions as well as lattice water molecules. In (2) each zinc(II) atom is coordinated by two pairs of unidentate carboxylate oxygen atoms and two aqua ligands in a distorted octahedral geometry and cross-linked by skeletons of double betaine ligands to form a corrugated layer structure corresponding to the plane (100).
TL;DR: In this article, the equilibrium constant for coordinative polymerization was measured for the first time, where the authors defined the constant K CP as [L] CP /[M][Ll, where L] CP represents the concentration of the ligand present in the coordination polymer.
Abstract: Equilibrium constant (K CP ) for coordinative polymerization is measured for the first time. Constant K CP is defined as [L] CP /[M][Ll, where [L] CP represents the concentration of the ligand present in the coordination polymer. Plot of absorbance changes measured for 3, a water-soluble derivative of o,o'-dihydroxyazobenzene, against the concentration of Ni(II) ion indicates formation of a 1:1-type complex in water at pH 7.74 and 25°C when Ni(II) is added in excess of 3. The 1:1-type complex can be either Ni3, the monomeric complex, or (Ni3),,, the coordination polymer. The equilibrium constant for formation of the 1:1-type complex is estimated as 10 13.10 by using UO 2 2 + ion as the competing metal ion. For the Ni(II) complex of an o,o '-dihydroxy-azobenzene derivative attached to poly(ethylenimine), the formation constant is estimated as 10 5.36 . Due to the structure of the polymer, possibility ofcoordinative polymerization is excluded for the polymer-based ligand. The much greater equilibrium constant for formation of the Ni(II) complex of 3, therefore, indicates formation of (Ni3) n instead of Ni3. The value of K cp for (Ni3) n shows that only 10 -7 % of the initially added 3 is left unpolymerized when Ni(II) is added in excess of3 by 10 -4 M.
TL;DR: The structure of the gel-grown coordination polymer Ag4(2,2-dimethylglutarate)2 was determined by X-ray crystallography as discussed by the authors, which is based on an unusual oligomeric unit, which was first found in silver(I) glutarate, and consists of a planar, centrosymmetric, tetranuclear silver cluster coordinated by two bridging ligands disposed at both sides of the metal plane.
TL;DR: The polymeric nickel complexes 3, 5, 7, 8 and cobalt complexes 4, 6 were synthesized from the bis (tetrabutylammonium) 2,3,6,7-tetrachloronaphthalene-1,5-dithiol-4,6-Dithiolate (2) or the tetrathiolate 1 and the corresponding metal-ions (Ni2+ and Co2+).
Abstract: The polymeric nickel complexes 3, 5, 7, 8 and cobalt complexes 4, 6 were synthesized from the bis (tetrabutylammonium) 2,3,6,7-tetrachloronaphthalene-1,5-dithiol-4,6-dithiolate (2) or the tetrathiolate 1 and the corresponding metal-ions (Ni2+ and Co2+), using a large excess of tetrabutylammonium bromide for introducing NBu4+ as counter ion. The diamagnetic nickel coordination polymer 3 was oxidized by iodine to the paramagnetic complex 5. By exchange of the NBu4+ ion by Ni2+ and the tetrathiafulvalenium ion, respectively, the complexes 7 and 8 are obtained.
The coordination polymer 7 was characterized as ferromagnetic beneath 20 K by investigating the temperature dependence of the magnetic susceptibility and the magnetization behavior. A coercive field of 1200 Oe was determined from the hysteresis loop of 7 at 4.4 K.
The measured heat capacity of 7 in dependence on the temperature is in good accordance with a ferromagnetic spin ordering below 20 K. Magnetic properties comparable with those of 7 were determined for the complexes 4 and 8.