Heteroboranes of the p-block elements

Icosahedral Carbaboranes with Peripheral Hydrogen–Chalcogenide Groups: Structures from Gas Electron Diffraction and Chemical Shielding in Solution

“…The tellurium homologue adds to the family of 12‐vertex closo systems, and in particular to those containing a group 16 element . 1‐TeB 11 H 11 has been mentioned in the literature but has so far not been structurally characterized.…”

Macropolyhedral Chalcogenaboranes: Insertion of Selenium into the Isomers of B18H22

“…13 On replacing the two sulfur atoms by two heavier selenium atoms, there is a general trend for the 11 B NMR shieldings of the [hypho-E 2 B 6 H 9 ̅ ] − anion type to be displaced to higher field by on average 3.5 ppm. This is most marked for the boron atoms B(8) and B (9), which are adjacent to the heteroatoms. Overall, the 11 B NMR shielding patterns for the anions [Se 2 B 6 H 9 ] − (5) and [S 2 B 6 H 9 ] − (5-thia) depict strong similarities, and therefore replacing a sulfur atom by a selenium atom has produced no significant perturbation of the 11 B NMR parameters, which is in accordance with the results found for the macropolyhedral heteroborane anions [E 2 B 17 H 18 ] − and [E 2 B 18 H 19 ] − (E = S, Se) above.…”

3 Boron

“…4 The syntheses, structures and reactivities of the heteroboranes in which p-block elements have replaced one or more vertices in the parent borane cages have been reviewed. 5 The synthesis, reactivity and spectroscopic and structural characterisation of high oxidation state icosahedral closo metallacarboranes of niobium, tantalum and tungsten has been reviewed. 6 The applications of main group Lewis acid-base pairs (especially B-N and B-P adducts) for the synthesis of sophisticated organometallic architectures have been reviewed.…”

“…is also reported. 43 The utilization of 1,1,1-trisborylalkanes as precursors for dicarbapentaboranes (5) by the synthesis of closo-1,5-bis(neopentyl)-2,3,4-trichloro-1,5-dicarbapentaborane and some derivatives has been reported. 44 The new monocarbaborane dianion, [arachno-4-CB 8 H 12 ] 2Ϫ has been synthesized from the reaction of arachno-4-CB 8 H 14 with 2 equivalents of NaH in polar solvents.…”

“…[(η 5 -C 5 R 5 R)Fe(CO) 2 ] 2 B(2,4,6-Me 3 -C 6 H 2 )}, via substitution chemistry with retention of the metal-boron bond. 129 The synthesis and characterization of iron and manganese complexes containing the tetrachlorocatecholboryl (BO 2 C 6 Cl 4 ) ligand have been reported, such as (η 5 Dinuclear species containing iron centres linked via various bridging boryl ligands have been synthesised and a combination of crystallographic, DFT and spectroscopic (Mössbauer, IR, Raman) techniques have been used to probe the bonding in these complexes. The conclusion is that π-contributions to the M-B bonding are small, and any differences in ligand orientation seen in the solid state are probably due to crystal packing effects.…”