Photoredox catalysis has emerged as a powerful strategy for C—O cross-coupling reactions. We herein report a new class of tridentate pyridinophane ligands .sup.RN3 that allow for detailed mechanistic studies of the photocatalytic C—O coupling reaction. The derived (.sup.RN3)Ni complexes are active C—O cross-coupling photocatalysts under mild conditions and without an additional photocatalyst. We also utilized the .sup.RN3 ligands to study the essential but so far putative steps involving paramagnetic Ni species in a proposed catalytic cycle: the oxidative addition of an aryl bromide to a Ni(I) species, the ligand exchange at a Ni(III) center, and the C—O reductive elimination from a Ni(III) species.

Photoredox catalysis has emerged as a powerful strategy for C—O cross-coupling reactions. We herein report a new class of tridentate pyridinophane ligands .sup.RN3 that allow for detailed mechanistic studies of the photocatalytic C—O coupling reaction. The derived (.sup.RN3)Ni complexes are active C—O cross-coupling photocatalysts under mild conditions and without an additional photocatalyst. We also utilized the .sup.RN3 ligands to study the essential but so far putative steps involving paramagnetic Ni species in a proposed catalytic cycle: the oxidative addition of an aryl bromide to a Ni(I) species, the ligand exchange at a Ni(III) center, and the C—O reductive elimination from a Ni(III) species.

An amino-imine metal complex represented by Formula I, its preparation method and an application thereof are provided. The complex is used as a main catalyst in catalysts for olefin polymerization, and can catalyze the polymerization of ethylene at a relatively high temperature to prepare branched polyethylene having high molecular weight.

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An amino-imine metal complex represented by Formula I, its preparation method and an application thereof are provided. The complex is used as a main catalyst in catalysts for olefin polymerization, and can catalyze the polymerization of ethylene at a relatively high temperature to prepare branched polyethylene having high molecular weight.

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A nanoribbon includes a structure represented by a structural formula (8), where g, p, q, r, s, t, and u are mutually independent and are integers greater than or equal to 1, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, and R.sup.8 are mutually independent and are one of a hydrogen atom, a substituent, an alkyl moiety, a phenyl moiety, and a halogen atom, and A denotes a hydrogen atom or an aryl group. ##STR00001##

The instant disclosure provides a process for synthesis of compound of Formula:
X.sub.a-M.sup.z+-Y.sub.b,
wherein M.sup.z+ is a transition metal ion and X and Y are carboxylate anions. The catalysts are hydrocarbon soluble and the process for their preparation, as disclosed herein, constitutes an elegant method for the preparation of such catalysts.

The instant disclosure provides a process for synthesis of compound of Formula:
X.sub.a-M.sup.z+-Y.sub.b,
wherein M.sup.z+ is a transition metal ion and X and Y are carboxylate anions. The catalysts are hydrocarbon soluble and the process for their preparation, as disclosed herein, constitutes an elegant method for the preparation of such catalysts.

Coordination complexes of tetrathiafulvalene-based dithiolene linkers, such as tetrathiafulvalene-2,3,6,7-tetrathiolate (TTFtt), and their oxidation products are described. The coordination complexes can include metals such as tin or silicon. Also described are methods of using the coordination complexes in transmetallation reactions, e.g., to prepare sulfur coordination polymers, and sulfur coordination polymers doped with tetrathiafulvalene-based dithiolene linkers having different oxidation states.

Coordination complexes of tetrathiafulvalene-based dithiolene linkers, such as tetrathiafulvalene-2,3,6,7-tetrathiolate (TTFtt), and their oxidation products are described. The coordination complexes can include metals such as tin or silicon. Also described are methods of using the coordination complexes in transmetallation reactions, e.g., to prepare sulfur coordination polymers, and sulfur coordination polymers doped with tetrathiafulvalene-based dithiolene linkers having different oxidation states.

Provided herein are metal organic frameworks comprising metal nodes and N-donor organic ligands which have high selectivity and stability in the present of gases and vapors including H.sub.2S, H.sub.2O, and CO.sub.2. Methods include capturing one or more of H.sub.2S, H.sub.2O, and CO.sub.2 from fluid compositions, such as natural gas.