Showing papers on "Polyoxometalate published in 1995"
TL;DR: In this paper, a thorough discussion of homogeneous catalysis by transition metal oxygen anion clusters (polyoxometalates), with a focus on mechanism, is provided, and a general compilation of the reactions, including catalytic electrooxidations or electroreductions, reported to date is given.
1,331 citations
255 citations
198 citations
97 citations
94 citations
TL;DR: Covalently linked polyoxometalate clusters are produced in the reaction of organic diisocyanates with [Bu4N]2[Mo6O19] as mentioned in this paper.
Abstract: Covalently linked polyoxometalate clusters are produced in the reaction of organic diisocyanates with [Bu4N]2[Mo6O19], suggesting the development of extended interconnected networks incorporating polyoxometalate ions.
58 citations
57 citations
TL;DR: The first charge-transfer salts containing the cationic ferrocenyl donor cpFecpCH 2 N + (CH 3 ) 3 and polyoxometalate acceptors of the Lindqvist structural type (M 6 O 19 2− ; M = Mo, W) have been isolated in high yields as mentioned in this paper.
34 citations
TL;DR: In this article, a new route to polyoxometalate pillared layered double hydroxides (LDHs) of the type [Mg 1− x 2+ Al x 3+ (OH) 2 ][POM n − ] x/n' where POM n− is the Keggin ion H 2 W 12 O 40 6−, is reported based on the atopotactic reactions of the corresponding LDH carbonate with glycerol or triethyleneglycol at 120-130°C and subsequent ion-exchange
32 citations
TL;DR: In this paper, the activated carbon has adsorbed onto it a protonated polymer, which has a polyoxometalate absorbed into the polymer, and a pair of the coated carbon electrodes are placed in contact with an electrolyte to form the device.
27 citations
TL;DR: In this paper, the polyoxometalate ions PMo12O403, PW 12O403−, and SiW12O404− are incorporated in polymeric ruthenium(II)(vinyl)bipyridine (poly-Ru(vbpy)32+) films from aqueous and dioxane-water electrolytes.
Abstract: The polyoxometalate ions PMo12O403−, PW12O403−, and SiW12O404− are incorporated in polymeric ruthenium(II)(vinyl)bipyridine (poly-Ru(vbpy)32+) films from aqueous and dioxane–water electrolytes. Despite their large mass the ions exist as freely diffusing species that compensate for up to 30% of the charge in poly-Ru(vbpy)32+. An investigation of the effect of environmental conditions on electrochemical behavior reveals that the first two one-electron reduction waves of SiW12O404− coalesce into a single two-electron reaction and those of PW12O403− shift significantly in potential upon a change from pure aqueous to 50(v/v)% dioxane/water solvent. The observation is attributed to destabilization of the one-electron reaction products as the solvent is enriched is dioxane. Incorporation of polyoxometalates in protonated poly(vinyl)pyridine and poly-Ru(vbpy)32+ films from dioxane–water solvent results in differences in electrochemical behavior. Polyoxometalate anions incorporated in poly-Ru(vbpy)32+ films cataly...
Patent•
28 Mar 1995TL;DR: In this paper, a method for the oxidative degradation of lignin and polysaccharide fragments dissolved during polyoxometalate delignification or bleaching of wood pulp, wood fiber or pulp or fiber obtained from a non-woody plant is presented.
Abstract: A method for oxidative degradation of lignin and polysaccharide fragments dissolved during polyoxometalate delignification or bleaching of wood pulp, wood fiber or pulp or fiber obtained from a non-woody plant. The method comprises the steps of obtaining a spent polyoxometalate bleaching solution containing a polyoxometalate of the formula [V1MomWnNboTap(TM)qXrOs]x- where 1 is 0-18, m is 0-40, n is 0-40, o is 0-10, p is 0-10, q is 0-9, r is 0-6, TM is a d-electron-containing transition metal ion, and x is a heteroatom; which is p or d block element, provided that 1 + m + n + o + p >= 4, 1 + m + q > 0 and s is sufficiently large that x > 0, and heating the solution in the presence of an oxidant under conditions wherein the dissolved organic compounds are oxidatively degraded to volatile organic compounds and water. The invention is further based upon the use of less caustic and less corrosive non-vanadium containing polyoxometalates for delignification or bleaching of wood pulp, wood fiber, or pulp or fiber obtained from a non-woody plant.
TL;DR: In this paper, self-assembly of new organic conjugates of the pentamolybdodiphosphonato cage with cyclic aminomethylphosphonates has been achieved.
Abstract: Self-assembly of new organic conjugates of the pentamolybdodiphosphonato cage with cyclic aminomethylphosphonates has been achieved. The crystal structures of two of the conjugates have been determined and all of them characterised by IR spectroscopy. Intramolecular hydrogen bonding of the aminomethyl moiety to cage oxygen and close intermolecular C–H ⋯ O–Mo contacts (between 2.3 and 2.5 A for the H ⋯ O distance) are observed, providing a new model for the interaction of substrates with a polyoxometalate catalytic surface. A scheme for modelling the pentamolybdodiphosphonato cage with a distance-restraint-based model is presented.
TL;DR: In this paper, the title compound was synthesized from molybdenum(VI) oxide and ammonium vanadate in aqueous solution by adding morpholine (pH 5.8).