Dicarbollide Ligands Research Articles

ChemInform Abstract: Synthesis and Structural Characterization of Metallacarborane Poly(pyrazolyl)borate Complexes.

AbstractThe first examples of mixed‐ligand sandwich complexes containing poly(pyrazolyl)borate and dicarbollide ligands are prepared according to the scheme.

ChemInform Abstract: Synthesis and Molecular Structures of closo‐3‐(η6‐CH3C6H5)‐3,1,2‐FeC2B9H11 and closo‐3‐(η6‐1,4‐(CH3)2C6H4)‐3,1,2‐FeC2B9H11.

AbstractThe η6‐arene complexes (IV) with a dicarbollide ligand are prepared directly from the reaction of the nido‐derivative (I).

A [8,8'-μ-I-3-Co(1,2-C2B9H10)2] metallacarborane complex with a iodonium bridge. Evidence for a bromonium analogue

The [8,8'-μ-I-3-Co(1,2-C2B9H10)2] complex with a iodonium bridge between both dicarbollide ligands was prepared and its constitution was established by NMR methods. It behaves as a Lewis acid opening its bridge by the action of Lewis bases to form {8-I-8'-L-3-Co(1,2-C2B9H10)2] species. The less stable bromonium analogue was not isolated but its existence was confirmed by the reaction with Lewis bases affording the [8-Br-8'-L-3-Co(1,2-C2B9H10)2]derivatives.

The crystal and molecular structure of Methyltriethylammonium μ-8,8′-oxa-3,3′-commo-bis(undecahydro-1,2-dicarba-3-cobalta-closo-dodecaborate) (1-), [N(C2H5)3CH3]+· [O(C2B9H10)2Co]−

Abstract. The structure of the title compound, C11H38B18CoNO was solved using X-ray diffraction techniques. The crystals are orthorhombic, space group Pna21 with a = 12.508(7), b = 15.935(2),c = 12.618(2) Å, Z = 4. The structure has been determined by the heavy-atom method and refined by the full-matrix least-squares method up to R = 0.066 for 1621 counter reflections. The ionic structure consists of the [N(C2H5)3CH3]+ cation and the [O(C2B9H10)2Co]− anion. The anion is built from two dicarbollide ligands sharing the cobalt atom as a common apex. Moreover, these two ligands are linked by a monoatomic oxygen bridge. The pentagonal planes bound to the cobalt atom are not parallel in the anion, but inclined to each other by an angle of 28.3°, which is caused by the oxygen bridge.

Actinide metallocarbaborane complex: synthesis and X-ray structure determination of the bis[η5-(3)-1,2-dicarbollyl]dichlorouranium(IV) dianion

The first actinide metallocarbaborane complex, [U(C2B9H11)2Cl2]2–, has been obtained by reaction of the 1,2-dicarbollide ion with UCl4 in tetrahydrofuran (THF), and a crystal structure determination of its lithium salt has shown the complex anion to have a distorted tetrahedral geometry with pentahapto-bonded dicarbollide ligands.

Heterogeneous electron transfer kinetics at the mercury-acetonitrile interface for some metal dicarbollide complexes and their metallocene analogs

Heterogeneous electron transfer kinetic parameters obtained by a.c. polarography in the frequency multiplex mode are presented for a series of electrode reactions at the mercury-acetonitrile interface involving cobalt and nickel picomplexes comprised of cyclopentadienide and/or dicarbollide ligands. The Frumkin double-layer correction is applied to the apparent ks-values. Relationships between the kinetic parameters and molecular structure characteristics are discussed.

Heterogeneous electron transfer kinetics at themercury-acetonitrile interface for some metal dicarbollide complexes and their metallocene analogs

Summary Heterogeneous electron transfer kinetic parameters obtained by a.c. polarography in the frequency multiplex mode are presented for a series of electrode reactions at the mercury-acetonitrile interface involving cobalt and nickel picomplexes comprised of cyclopentadienide and/or dicarbollide ligands. The Frumkin double-layer correction is applied to the apparent ks-values. Relationships between the kinetic parameters and molecular structure characteristics are discussed.