摘要:
Multi-layered compositions having a plurality of pillared metal complexes disposed on a supporting substrate (2), the pillars comprising divalent electron acceptor moieties (12) with a phosphonate or arsenate (14) at each end. Each layer of parallel pillars is separated by a layer of a group (IVA), (IVB), (IIIA) or (IIIB) metal or a lanthanide (18). The compositions can further comprise particles of at least one group VIII metal at zero valence entrapped within each layer of the complex (16). The complexes can also incorporate 'stalactites' and 'stalagmites' of capped arsonato or phosphonato ligands interspersed with the pillars providing a series of interstices about each electron accepting group. The supporting substrate can be comprised of an organic polymer template. The complexes are useful for the conversion and storage of solar energy, for the production of photocurrents, and as catalyst for reduction reactions, for example, the production of hydrogen peroxide from oxygen and hydrogen gases, the production of H2 gas from water, and the reduction of ketones to form alcohols.
摘要:
Stable electron acceptor compositions are composed of a plurality of pillared metal complexes disposed on a supporting substrate. At least one Group VIII metal at zero valence is entrapped within this matrix. The complexes comprise from one to about 100 units of the formula: -(Y1O3-Z-Y2O3)Me?1-, Y1 and Y2¿ being phosphorus or arsenic; Z being a divalent group which reversibly forms a stable reduced form and contains two conjugated cationic centers having a negative E°¿red? value; and Me?1¿ being a trivalent or tetravalent metal of Group III, IVA, or IVB having an atomic number of a least 21 or a lanthanide. The units are bound to the substrate through a divalent linking group. Counter anions balance the charge of Z. The compositions can be used in the decomposition of water to yield hydrogen gas, the sensing of oxygen, and as catalysts.
摘要:
Multi-layered compositions having a plurality of pillared metal complexes disposed on a supporting substrate (2), the pillars comprising divalent electron acceptor moieties (12) with a phosphonate or arsenate (14) at each end. Each layer of parallel pillars is separated by a layer of a group (IVA), (IVB), (IIIA) or (IIIB) metal or a lanthanide (18). The compositions can further comprise particles of at least one group VIII metal at zero valence entrapped within each layer of the complex (16). The complexes can also incorporate 'stalactites' and 'stalagmites' of capped arsonato or phosphonato ligands interspersed with the pillars providing a series of interstices about each electron accepting group. The supporting substrate can be comprised of an organic polymer template. The complexes are useful for the conversion and storage of solar energy, for the production of photocurrents, and as catalyst for reduction reactions, for example, the production of hydrogen peroxide from oxygen and hydrogen gases, the production of H2 gas from water, and the reduction of ketones to form alcohols.
摘要:
Multi-layered compositions having a plurality of pillared metal complexes disposed on a supporting substrate, the pillars comprising divalent electron acceptor moieties with a phosphonate or arsenate at each end. Each layer of parallel pillars is separated by a layer of a group (IVA), (IVB), (IIIA) or (IIIB) metal or a lanthanide. The compositions can further comprise particles of at least one Group VIII metal at zero valence entrapped within each layer of the complex. The complexes can also incorporate 'stalactites' and 'stalagmites' of capped arsonato or phosphonato ligands interspersed with the pillars providing a series of interstices about each electron accepting group. The supporting substrate can be comprised of an organic polymer template. The complexes are useful for the conversion and storage of solar energy and as catalysts for reduction reactions, for example, the production of hydrogen peroxide from oxygen and hydrogen gases, the production of H2 gas from water, and the reduction of ketones to form alcohols.
摘要:
A catalytic process for producing hydrogen peroxide from oxygen and hydrogen comprising the steps of:
A) treating an aqueous suspension of heterogeneous catalyst with a source of oxygen and a source of hydrogen; B) separating the catalyst; and, C) isolating the produced hydrogen peroxide, wherein said catalyst is a complex of the formula: wherein each of Y 1 , Y 2 , and Y 3 , independently of the other, is phosphorus or arsenic; Z is a divalent group which reversibly forms a stable reduced form, said group containing two conjugated cationic centers which together have a negative E o red value; Me 2 is a trivalent or tetravalent metal of Group III, IVA, or IVB having an atomic number of at least 21 or a lanthanide; X is anion; n has a value of from 0 to 0.8; and p has a value of 1, 2 or 3; and R 3 is a nonreducible capping group.
摘要:
Multi-layered compositions having a plurality of pillared metal complexes disposed on a supporting substrate (2), the pillars comprising divalent electron acceptor moieties (12) with a phosphonate or arsenate (14) at each end. Each layer of parallel pillars is separated by a layer of a group (IVA), (IVB), (IIIA) or (IIIB) metal or a lanthanide (18). The compositions can further comprise particles of at least one group VIII metal at zero valence entrapped within each layer of the complex (16). The complexes can also incorporate 'stalactites' and 'stalagmites' of capped arsonato or phosphonato ligands interspersed with the pillars providing a series of interstices about each electron accepting group. The supporting substrate can be comprised of an organic polymer template. The complexes are useful for the conversion and storage of solar energy, for the production of photocurrents, and as catalyst for reduction reactions, for example, the production of hydrogen peroxide from oxygen and hydrogen gases, the production of H2 gas from water, and the reduction of ketones to form alcohols.