140693-33-0Relevant academic research and scientific papers
Ten-vertex Metalloborane Chemistry. Aspects of the Iridadecaborane closo->isonido->isocloso Structural Continuum
Bould, Jonathan,Kennedy, John D.,Thornton-Pett, Mark
, p. 563 - 576 (1992)
Reaction of the arachno-(1-) or nido-(1-) anions with at ca. 298 K gives, in addition to previously reported species, pale violett 2 in yields of ca. 2percent.Single crystal X-ray diffraction analysis and multinuclear NMR spectroscopy reveal a ten-vertex cluster of an 'isonido' type that is based upon the closo eleven-vertex structure of (2-) from which a four-connected vertex is removed to generate a four-membered open face.There are two fluxional bridging hydrogen atoms associated with the open face.Thermolysis at ca. 355 K of solutions in 1,1,2,2-tetrachloroethane of yellow 4 result in loss of hydrogen and the formation of deep purple 5 (0-5 percent) and royal blue 6 (0-5 percent).Single crystal X-ray diffraction shows that compounds 5 and 6 also have isonido cluster structures, although 5 does not have bridging hydrogen atoms on the open face, suggesting that any extra electrons required for it to be isoelectronic with 2 and 6 may originate from the metal vertex.The structure of the crystal of compound 6 examined was found to contain ca. 25 mole percent of the isostructural 3-chloro derivative 6a.The ten-vertex clusters 2,5 and 6 are part of a structural continuum ranging from closo through isonido to isocloso.It is proposed that these isonido compounds represent intermediates in a variety of reactions involving nido to isocloso cluster oxidations and nido to nido rearrangements.
