ChemInform Abstract: Stabilization of Niobium(0) and Tantalum(0) in Heterometal Clusters Containing Silver Atoms.

Abstract

ChemInform Abstract The reactions of (I) with Ag salts of non-coordinating anions yield the clusters (III) which are characterized by X-ray analyses (both space group R3c with Z = 6).

Converting Carbon Dioxide into Carbamato Derivatives

“…The literature reports several cases of transfer reactions of the carbamato ligand. Such reactions have been used for the synthesis of transition metal derivatives such as Ti(O 2 CNR 2 )Cp 2 , magnesium and phosphorus carbamates, Mg(O 2 CNR 2 ) 2 , R = Et, i Pr, and P(O 2 CNR 2 )X(CF 3 ) 3 . , The anionic ligands are redistributed in the products and no change of oxidation state takes place …”

“…The titanium(IV) derivative Ti(O 2 CNEt 2 ) 4 undergoes ligand transfer accompanied by reduction with complexes of vanadium(0), vanadium(II), , titanium(II), or zirconium(II) …”

Open-Shell Organometallics as a Bridge between Werner-Type and Low-Valent Organometallic Complexes. The Effect of the Spin State on the Stability, Reactivity, and Structure

“…These materials were later found to be dinuclear, carboxylato-bridged compounds ( XLII ). , However, the absence of a metal−metal bonding interaction is consistent with a 16-electron configuration around each vanadium center. Carbamates have an analogous tetrabridged dinuclear structure . These dinuclear systems show reduced magnetic moments (1.4−1.8 μ B per V atom) because of antiferromagnetic coupling between the two spin triplet metal centers. , Dinuclear tetrathiolato-bridged compounds, [CpV(μ-SR) 2 ] 2 , also have antiferromagnetically coupled S = 1 metal centers.…”

“…Carbamates have an analogous tetrabridged dinuclear structure . These dinuclear systems show reduced magnetic moments (1.4−1.8 μ B per V atom) because of antiferromagnetic coupling between the two spin triplet metal centers. , Dinuclear tetrathiolato-bridged compounds, [CpV(μ-SR) 2 ] 2 , also have antiferromagnetically coupled S = 1 metal centers. A mononuclear system is obtained from Cp 2 V and formamidine ( XLIII )…”

Assembly of the Inorganic Double Helix Mg6(Et2NCO2)12 by Fixation of Carbon Dioxide: Crystal and Solution Structure

“…The alternative reaction used magnesium bromide as the Mg 2+ source, reacting it with diethylamine and carbon dioxide in a one-pot preparation yielding 1 . This alternative reaction is directly analogous to that used by Calderazzo et al in the preparation of the transition metal derivatives. , A metathesis method was previously employed in the preparation of the compositionally related complex Mg( i -pr 2 NCO 2 ) 2 , which was not structurally characterized.…”