- Anhydrous polymeric zinc(II) octanoate
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The structure of the title compound, poly[zinc(II)-bis(μ-octanoato-O:O′)], [Zn(C8H15O2)2]n, consists of polymeric sheets parallel to (100) in which tetrahedrally coordinated Zn2+ cations are connected by carboxylate bridges in a synanti arrangement.
- Lacouture, Francoise,Peultier, Jerome,Francois, Michel,Steinmetz, Jean
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- Anion Directed Selective Synthesis of Supramolecular Metallocycles and Related Coordination Dimers
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The reaction of C3-symmetric tris-(2-pyridinylene-N-oxide)triaminoguanidinium salts ([H3L]X) and zinc(II) in presence of thiocyanate and different carboxylate ions as co-ligands yields in a series of different coordination compounds. Supramolecular metallocycles and carboxylate-bridged dimers are defined by two fundamentally different binding motifs. By adjusting the co-ligands’ stoichiometry, metallocycles and carboxylate-bridged compounds can be synthesized selectively. Furthermore, the occupation of the metallocycles with co-ligands can also be controlled that way. Directed synthesis of these metallocycles is essential for further application in host-guest chemistry due to their cavities and porosity in the solid state.
- Sturm, Lisa,G?b, Christian R.,Oppel, Iris M.
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supporting information
p. 1050 - 1056
(2021/02/01)
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- Phase diagrams and optical properties of binary liquid-crystal systems of cobalt(II) caprylate with a divalent metal caprylate
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Phase equilibria in the binary systems of cobalt(II) caprylate with a divalent metal (lead, cad- mium, or zinc) caprylate were studied by differential thermal analysis and polarization microscopy, and the concentration and temperature ranges of the existence of liquid crystals and glasses were determined. Con- tinuous or boundary smectic liquid-crystal solutions were found to form in all the systems. The temperature and concentration dependences of the electronic absorption spectra of liquid crystals and glasses in binary systems based on cobalt caprylate were investigated. Pleiades Publishing, Ltd., 2012.
- Tokmenko,Mirnaya,Yaremchuk
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p. 1141 - 1145
(2012/10/08)
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- Room temperature molecular and lattice structures of a homologous series of anhydrous zinc(II) n-alkanoate
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The room temperature structures and lattice arrangements of a homologous series of zinc(II) n-alkanoates from chain length, nC = 4-20, inclusive, have been studied using infrared spectroscopy, X-ray diffraction and polarizing light microscopy. Lattice parameters from single crystal and powder diffraction data, for zinc(II) hexanoate, are compared to validate the use of the powder method. Since they are in excellent agreement, the powder data are analyzed by a software programme to determine lattice parameters for all the homologues. These are used, in conjunction with infrared, X-ray, density and molecular model calculations to determine molecular and lattice structures. The compounds are isostructural, in that, each zinc atom is tetrahedrally coordinated to oxygen atoms from four different carboxylate groups and each ligand forms a Z,E-type bidentate bridge with two tetrahedral zinc atoms resulting in a syn-anti arrangement. The hydrocarbon chains are in the fully extended all-trans configuration and are tilted at an average angle of 60° to the zinc basal plane. For the short chain length compounds with nC ≤ 8, a double bilayer in-plane-perpendicular-perpendicular-in-plane arrangement of hydrocarbon chains, with two molecules per unit cell, is indicated. For the others, an interdigitating in-plane-in-plane bilayer with head-to-tail interactions, with one molecule per unit cell, is proposed. A geometric model is presented to account for odd-even chain effects and to explain the differences in melting points and densities between these adducts. All the compounds crystallize in the monoclinic space group with P symmetry and are arranged in a two-dimensional network along the ac plane within the unit cell.
- Taylor, Richard A.,Ellis, Henry A.
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- Influence of the spatial structure of the alkyl chain on the composition of the product of the direct neutralization reaction between aliphatic carboxylic acids and zinc hydroxide
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A study was launched to clarify the influence of the spatial structure of the alkyl chain on the products of the direct neutralization reactions between zinc hydroxide and several non-cyclic saturated carboxylic acids in the presence of an excess of either the carboxylic acid or zinc hydroxide. The species formed were identified on the basis of their FT-IR spectra in the mid-IR region. Straight-chain acids produced the corresponding zinc bis-carboxylates with polymeric sheet structure under all circumstances. The species present in the products of the branched-chain carboxylic acids depended strongly on the nature of the component in excess and the bulk of the alkyl group. Besides the starting materials the reaction mixtures contained two carboxylate species in various ratios. One of them was the zinc bis-carboxylate of the branched-chain carboxylic acid, characterized by an additional νC=O band at around 1630 cm-1, above the usual two strong carboxylate stretching bands. The other species was the corresponding complex Zn4O(RCOO)6. The conditions of formation of these three forms of zinc carboxylates were formulated on the basis of the decreasing possibility of interaction between the neighbouring alkyl chains to form a polyethylene subcell in the sequence of: Zn(RCOO)2 (polymeric sheet) > Zn(RCOO)2 (intermediate form) > Zn4O(RCOO)6 (tetranuclear complex).
- Dreveni,Berkesi,Andor,Mink
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- Physicochemical studies on zinc dicaprylate
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Zinc dicaprylate has been prepared and characterised by IR, X-ray and TGA techniques.In addition, conductometric, viscometric and density measurements of the soap solutions have been carried out in benzene-methanol mixture (50percent, v/v).The IR results support the ionic nature of zinc dicaprylate as well as the dimeric structure of the fatty acid.The X-ray study reveals that zinc soap has a single layer structure.The TGA results suggest that the thermal decomposition of zinc dicaprylate is kinetically of zero order with activation energy of 8.9 kcal mol-1.The values of the critical micelle concentration, CMC, for solutions containing 40percent, 50percent and 60percent methanol in methanol-benzene mixture are 1.9*10-3, 2.1*10-3 and 2.4*10-3 M, respectively.Viscosity and density measurements also support the commencement of micellization at these critical soap concentrations.
- Mehrotra, K N,Singh, Suman,Kumar, Anil
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p. 756 - 759
(2007/10/02)
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- Aspects of the Inorganic Chemistry of Rubber Vulcanisation. Part 1. Reactions of Zinc Bis(dithiocarbamates) and Bis(benzothiazole-2-thiolates) with Carboxylates, and the Structure of 2(μ-OCOMe)>
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Reaction of with (R=Me or n-Bu; R'=Me, Et, n-Pr, or n-Bu) gives -, but when R'=n-C5H11, n-C6H13, n-C7H15, n-C8H17, or C17H35, only has been isolated.Treatment of n> (
- McCleverty, Jon A.,Spencer, Neil,Bailey, Neil A.,Shackleton, Stephen L.
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p. 1939 - 1944
(2007/10/02)
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