Transition metal complexes containing the 1,2-dicarba-closo-dodecaborane-1,2-dithiolate ligand: crystal structures of [4-MeC5H4NMe]2[Pd(S2C2B10H10)I2], [NEt3H][Mo(η5-C5H5)(NO)(S2C2B10H10)I], [NBu4][Re(O)(S2C2B10H10)2] and [4-MeC5H4NMe]2[{Mo(O)(μ-O)(S2C2B10H10)}2]
- 1 January 1998
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 13,p. 2163-2168
- https://doi.org/10.1039/a802446d
Abstract
The dithiol ligand 1,2-dicarbaborane-1,2-dithiol, 1,2-(HS)2-1,2-C2B10H10 (H2cbdt), reacted with anhydrous PdI2 to form [Pd(cbdt)I2]2–, isolated as its [4-MeC5H4NMe]+ salt 1 and with [{Mo(η5-C5H5)(NO)I2}2] in the presence of NEt3 to afford the mononuclear complex [NEt3H][Mo(η5-C5H5)(NO)(cbdt)I] 2. Complete halide substitution occurred with [NBu4][Re(O)Cl4] to give [NBu4][Re(O)(cbdt)2] 3 and the reaction with MoCl5 in tetrahydrofuran afforded the oxo-bridged molybdenum(V) dimer [4-MeC5H4NMe]2[Mo(O)(µ-O)(cbdt)}2] 4 which is diamagnetic. The salts 1–4 have been characterised by single crystal X-ray diffraction studies. In all cases only very limited conjugation appears to occur between the sulfur atoms and the carbon atoms of the carbaborane cage, C–S bond lengths averaging 1.785 Å, slightly shorter than the pure single bond value. The electrochemical properties of the new complexes were investigated but no simple reversible electron transfer processes were observed.Keywords
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