118541-47-2Relevant academic research and scientific papers
Metallaheteroborane Chemistry. Part 4. The Synthesis of closo- (X=Se or Te, M=Rh or Ir) Compounds, their Characterisation by Nuclear Magnetic Resonance Techniques, and the Crystal and Molecular Structure of the X=Te, M=Rh Complex
Faridoon,Dhubhghaill, Orla Ni,Spalding, Trevor R.,Ferguson, George,Kaitner, Branko,et al.
, p. 2739 - 2746 (2007/10/02)
The reactions between (M=Rh or Ir) and the nido-- (X=Se or Te) anions in ethanol afford air-stable closo- complexes in moderate to high yields.N.m.r. date confirm the presence of the M(PPh3)2H units and the closo nature of the metallaheteroboranes.An X-ray diffraction study of closo-*0.5C6H12 shows the triclinic crystals to belong to the P space group with Z=2 and cell dimensions a=12.406(1), b=17.872(4), c=10,010(1) Angstroem, α=94.30(1), β=107.25(1), and γ=94.31(1) deg.The final R factor was 0.033 for 5 380 observed reflections.Principal interatomic distances include Rh-Te 2.617 2(4), Rh-B 2.238(4) - 2.333(5), and Te-B 2.296(4) - 2.399(4) Angstroem.The conformation of the Rh(PPh3)2H unit above the TeB4 face to which it is bonded has the Rh-H and Rh-Te vectors trans to each other.The conformational preferences of M(PPh3)2H units in the new complexes and in electronically related metallacarbaboranes are discussed.The detailed n.m.r. properties indicate a close electronic relationship with the previously reported (X=Se or Te) species.
