A trinucleating oxygen-containing ligand with two different coordination sites and its heterotrinuclear complexes

1,1';2,2'-Bis-μ-dimethylsilyl-bis[1,2-dicarba-closo-dodecaborane(12)], C8H32B20Si2

“…Our research on the coordination chemistry of macrocyclic derivatives of S,S'-connected strings of the moiety 7, 8-dimercapto-7,8-dicarba-nido-undecaborate(l-) (Teixidor, Vifias, Rius, Miravitlles & Casab6, 1990, and references therein; Teixidor, Casab6, Vifias, Sanchez, Escriche & Kivek~is, 1991) has shown the singularity of their chemistry. These studies have been extended to monomercapto-nidocarbaborane species, which have shown remarkable behavior.…”

2-Methyl-1-phenylsulfanyl-1,2-dicarba-closo-dodecaborane(12)

“…The observed C1ÐC2 distance in (I) is in line with our earlier results obtained for neutral 1,2-disubstituted o-carboranes. The distance is slightly longer than that in compounds with aliphatic C atoms connected to both cluster C atoms [1.670 (3) and 1.684 (6) A Ê ; Kiveka È s et al, 1998;Holbray et al, 1993], but is much shorter than the corresponding distance in 1,2-S 2 -substituted closo compounds [1.799 (3)± 1.858 (5) A Ê ; Llop et al, 2002;Teixidor, Romerosa et al, 1990;Teixidor, Vin Ä as et al, 1990].…”

Macrocycles incorporating closo- and nido-carbaborane cages: molecular structure of 1,2-(3′-oxapentane-1′,5′-dithiolato-SS′)-1′,2′-dicarba-closo-dodecaborane

“…1,l '-Ethylenebis( 1,2-dicarba-closo-dodecaborane) (12). To a three-neck flask (250 cm3) fitted with a reflux condenser having a gas inlet-outlet was added C2B ,H , (1 g, 6.94 mmol) and dry benzene (40 cm3).…”

“…Tetramethylammonium 7,7'-ethylenebis(7,8-dicarba-nido-un-decab0rate)dihydrate (13). To a three-neck flask equipped with a reflux condenser having a gas inlet-outlet connected to a nitrogen manifold was added compound (12) (1 g, 3.18 mmol) and KOH (0.54 g, 9.54 mmol) in degassed absolute ethanol (30 cm3). After 4 h of reflux the reaction mixture was cooled and water (30 cm3) and tetramethylammonium chloride (excess) were added.…”

“…2,2'-Ethylenebis( 1 -mercapto-1,2-dicarba-closo-d0decaborane) (14). To a three-neck flask equipped with a gas inlet-outlet connected to a nitrogen manifold and containing dry diethyl ether (30 cm3) was added compound (12) (1 g, 3.18 mmol) and butyl-lithium (4 cm3, 6.5 mmol). After 30 min, sulphur (0.21 g, 6.6 mmol) was added slowly.…”