Amido-ligand described

R = R = Cy R = 1-adamantyl, R = CfiH 5. Te2-3,5 5 ). The vanadium analogue of the latter [V N(l-Ad)(C6H3Me2-3,5) 3] " 4 has also been characterized. Furthermore, a more efficient route to [Cr N(SiMe3)2 3] and a new crystal structure determination has been described. Three-coordinate metal amides have been treated in a general review that covers three-coordinate transition metal species with hard ligands. The electronic structure and bonding in tricoordinate amido complexes of transition metals have also been detailed... 

The electronic spectra of the solid complexes are practically identical to those of the same complexes in aqueous solution101), as reported in Table 8. This means that, contrary to all previously described complexes of metal ions with polymeric ligands, the poly(amido-amines) complex compounds have a well defined stoichiometry. 

Aside from the neutral tris(amido)actinide complexes that have been prepared with sterically encumbering ligands as described, an alternate approach to the stabilization of trivalent actinide amides is the generation of anionic ate -type complexes. As an example, reaction of Ul3(THF)4 with excess KHNAr (Ar = 2,6-Pr 2CgH3) produces the anionic complex [K(THF)2]2[U(NHAr)5] which has been crystallographically characterized. ... 

Actinide(IV) alkoxide complexes have been reported which are coordinated by a variety of other bulky ligand sets. Uranium(IV) amido compounds are reagents for the preparation of homoleptic uranium(IV) alkoxides as well as mixed alkoxide/amido species. A variety of mixed aryloxide-diethylamide derivatives have been pr ared including (U(NEt2)(0-2,6-Bu 2C6H3)3 and U(NEtp(0-2,6-R7CftH3)3. R = Pr . Bu ). The previously described metallacycle... 

Out of a number of preparative routes described in Section II for preparing metal alkoxides, those involving (a) the metal-carbon bond cleavage reaction (Section II.F), (b) the chloride-alkoxide exchange reaction (Section II.C. 1), (c) the amido-alkoxo exchange reaction (Section II.E), and (d) the alcoholysis reaction (Section II.D) appear to be more convenient and versatile. Schemes 1-6 summarize some of the typical reactions studied for the preparation of metal complexes of alcohol ligands with large steric requirements. 

Several Cr111 complexes with activated amido donor ligands (e.g., amides of carboxylic or sulfonic acids) have been described, but none of them have been crystallographically characterized.132,479 Complexes of Cr111 with 2-sulfonamide-1,3,4-thiadiazol derivatives act as potent inhibitors of carbonic anhydrases and may have potential use as anti-inflammatory or antidiabetic drugs.479,480... 

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