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Coordination polymer
About: Coordination polymer is a research topic. Over the lifetime, 11988 publications have been published within this topic receiving 212219 citations.
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TL;DR: Interestingly, whereas no Ag-π interactions were observed for the 2D network, a combination of coordination bonding with the pyridyl moieties and Ag- π interactions was detected for the 1D architecture.
Abstract: Using ligands based on either an acetylacetonate or a dipyrrin moiety appended with pyridyl groups, a series of novel heteroleptic copper(II) and cobalt(III) complexes combining both chelate units such as (acacpy2)Cu(dpm-py) and (acacpy2)Co(dpm-py)2 (acacpy2 = 1,3-bis(4-pyridyl)-1,3-propanedionate; dpm-py = 5-(4-pyridyl)dipyrrin) have been prepared and fully characterized. These two complexes were obtained upon reaction of dpm-py with the (acacpy2)M homoleptic species (M = Cu(II), Co(II)). In the solid state, the (acacpy2)Cu(dpm-py) complex behaves as a self-complementary metallatecton and leads to the formation of a 1D coordination polymer (CP) through the coordination of a peripheral pyridyl group to the copper centre. Contrastingly, the octahedral (acacpy2)Co(dpm-py)2 complex featuring a coordinatively saturated Co(III) centre crystallizes as an isolated mononuclear species. In order to generate heterometallic CPs, both complexes have been used as metallatectons upon their combination with different silver(I) salts. Upon reaction of (acacpy2)Cu(dpm-py) with Ag(BF4) or Ag(TfO), 2- and 3-D heterometallic networks were obtained, respectively. In both cases, sheet type arrangements resulting from the binding of Ag+ cations by three peripheral pyridyl groups were observed. These 2D sheets are further interconnected through Ag–π interactions with the pyrrolic rings. Under the same conditions, the combination of (acacpy2)Co(dpm-py)2 with Ag(TfO) leads to two networks differing by their connectivity patterns and dimensionality. Interestingly, whereas no Ag–π interactions were observed for the 2D network, a combination of coordination bonding with the pyridyl moieties and Ag–π interactions was detected for the 1D architecture.
57 citations
TL;DR: A 1D trimetallic coordination polymer containing mixed molybdenum-vanadium heteropolyoxometalate bridges, called I, was synthesized hydrothermally as discussed by the authors.
Abstract: A 1D trimetallic coordination polymer containing mixed molybdenum-vanadium heteropolyoxometalate bridges, {[Ni(phen)(2)(H2O)](2) [Ni(phen)(2)] [(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)[Ni(phen)(2)(H2O)](2)[(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)(2)]}.5H(2)O.2EtOH (1) (phen=1,10-phenanthroline, EtOH = ethanol), has been synthesised hydrothermally. An X-ray crystallographic study revealed that I is composed of ID zigzag chains of {[Ni(phen)(2)(H2O)](2)[Ni(phen)(2)][(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)]}(n)(n+) cations, {[Ni(phen)(2)(H2O)](2) [(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)(2)]}(-) anions and solvent molecules. Both the cation and the anion in 1 are mixed molybdenum-vanadium heteropolyoxometalates with covalently linked nickel complex fragments. Magnetic investigations of I indicate spin glass behaviour and several magnetic transitions occur at low temperatures (below 20 K). ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004).
57 citations
TL;DR: In this paper, a 3D molecular architecture with parallelogrammic channels is presented, in which the (4,4) layers are assembled via strong hydrogen bonds between the aqua ligands and the uncoordinated carboxylate oxygen atoms into a porous 3-dimensional molecular architecture.
57 citations
TL;DR: By the formation of supramolecular coordination polymers, the intramolecules energy transfer changed to intermolecular energy transfer from PZnPM to PyPM and the fluorescence emission from the focal PFB was gradually increased and that from the nonfluorescent PyPCu was gradually decreased.
Abstract: We report the formation of supramolecular coordination polymers formed from multiporphyrin dendrimers (PZnPM; M = FB or Cu), composed of the focal freebase porphyrin (PFB) or cupper porphyrin (PCu) with eight zinc porphyrin (PZn) wings, and multipyridyl porphyrins (PyPM; M = FB or Cu), PFB or PCu with eight pyridyl groups, through multiple axial coordination interactions of pyridyl groups to PZns. UV–vis absorption spectra were recorded upon titration of PyPFB to PZnPFB. Differential spectra, obtained by subtracting the absorption of PZnPFB without guest addition as well as the absorption of PyPFB, exhibited clear isosbestic points with saturation binding at 1 equiv addition of PyPFB to PZnPFB. Job’s plot analysis also indicated 1:1 stoichiometry for the saturation binding. The apparent association constant between PZnPFB and PyPFB (2.91 × 106 M–1), estimated by isothermal titration calorimetry, was high enough for fibrous assemblies to form at micromolar concentrations. The formation of a fibrous assembl...
57 citations
01 Jan 2002
TL;DR: In this article, the bidentate ligand 1,2-bis(tetrazol-1-yl)ethane [endi] was synthesized and characterized by X-ray diffraction, NMR, IR and UV � /Vis spectroscopy.
Abstract: In analogy to a common synthesis of 1-substituted 5-H tetrazoles (Tetrahedron Lett. 36 (1995)1759; Beloruss. Gos. Univ., Minsk, USSR. Khim. Geterotsikl. Soedin. 11 (1985) 1521; Beloruss. Gos. Univ., Minsk, USSR. Khim. Geterotsikl. Soedin. 1 (1991) 66; BGU, Belarus. Vestsi Akad. Navuk Belarusi, Ser. Khim. Navuk 1 (1992) 73), the new bidentate ligand 1,2-bis(tetrazol-1-yl)ethane [endi] was synthesized and characterized by X-ray diffraction, NMR, IR and UV � /Vis spectroscopy. By using iron(II) tetrafluoroborate hexahydrate the complexation with this ligand yields a 1-dimensional linear coordination polymer similar to the recently published chain compound (Inorg. Chem. 39 (2000) 1891) exhibiting a thermally induced spin-crossover phenomenon. Similar to the 1,2-bis(tetrazol-1-yl)propane-bridged compound, our 1,2-bis(tetrazol-1-yl)ethane-bridged compound shows a gradual spin transition, but the spin-crossover temperature T1/2 :/140 K is found to be 10 K above the other T1/2. The T1/2 was determined
57 citations