Heterobimetallics molecular

Magnetism of Heterobimetallics Toward Molecular-Based Magnets Olivier Kahn... 

Heteroaromatic diols, 40 257 Heterobimetallics, 43 179-254, see also Metals cyano-bridged, 43 244-249 molecular, 43 249... 

Larsen, J., Rasmussen, B.S., Hazell, R.G. and Skrydstrup, T, (2004) Preparation of a novel diphosphine-palladium macrocyclic complex possessing a molecular recognition site. Oxidative addition studies. Chem, Commun., 202-203 Braunstein, P., Clerc, G. and Morise, X. (2003) Cyclopropanation and Diels-Alder reactions catalyzed by the first heterobimetallic complexes with bridging phosphinooxazoline ligands. New J. Chem., 27,68-72 Braunstein, P., Clerc, G., Morise, X., Welter, R. and Mantovani, G. (2003) Phosphinooxazolines as assembling ligands in heterometallic complexes. Dalton Trans., 1601-1605. 

A heterobimetallic polycarbostannane 64142 was obtained from the reaction of the bidentate [Fe(CO)2Cp-X-Cp(CO)2Fe]2- (X = -CHNMe2CHNMe2-) with Ph2SnCl2. The molecular weight as determined by osmometry was Mn = 8.5 x 1()3 gmol-1, indicating relatively short chains. The reaction of the methylene-substituted dianionic... 

Treatment of a suspension of Nd(NHPh)3(KCl)3 with trimethylalumi-num in hexane yielded the heteroleptic heterobimetallic cluster [Nd[(//.2-Me)2A/Me2]2(M3-NPh)(M2-Me)AlMe 2 in low yield (Fig. 29). The formation of the cyclic byproduct (Me2AlNHPh)3 was proven by means of NMR spectroscopy and X-ray crystallography [217]. The molecular structure of the Nd2Al6 dimer revealed the presence of a doubly deprotonated imido ligand bridging each a neodymium center and two aluminum atoms. 

Most of the knowledge about aluminate and alkylaluminum coordination stems from X-ray crystallographic studies. The basic idea of this section is to compile a rare-earth metal aluminate library categorizing this meanwhile comprehensive class of heterobimetallic compounds. Main classification criteria are the type of homo- and heterobridging aluminate ligand (tetra-, tri-, di-, and mono alkylaluminum complexes), the type of co-ligand (cyclopen-tadienyl, carboxylate, alkoxide, siloxide, amide), and the Ln center oxidation state. In addition, related Ln/Al heterobimetallic alkoxide complexes ( non-alkylaluminum complexes) are surveyed. Emphasis is not put on wordy structure discussions but on the different coordination modes (charts) and important structural parameters in tabular form. An arbitrary collection of molecular structure drawings complements this structural report. 

The ready access of the hydroxides 1-11 opened the possibility for designing the synthesis of heterometallic complexes with the potential to be used as molecular catalysts. The synthetic strategy takes advantage of the Br0nsted acidic character of the M(0—H) moiety in building up a new class of heterometallic complexes. The aluminum hydroxide (5a-5h) can build up new heterobimetallic complexes by reacting with other suitable... 

The heterobimetallic complexes [N(n-Bu)4] [Os(N)R2(/u.-0)2Cr02] catalyze the selective oxidation of alcohols with molecular oxygen. A mechanism in which alcohol coordinates to the osmium center and is oxidized by B-hydrogen elimination (see -Hydride Elimination) is consistent with the data. The hydroxide adduct of OSO4, [0s(0H)204], with ferric cyanide and other co-oxidants catalyzes the oxidative dehydrogenation of primary aromatic and aliphatic amines to nitriles, the oxidation of primary alcohols to carboxylic acids, and of secondary alcohols to ketones. Osmium derivatives such as OsCb catalyze the effective oxidation of saturated hydrocarbons in acetonitrile through a radical mechanism. ... 

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