Derivate des Borabenzols. 25 [1]. Methylbis(1-methylboratabenzol)indium: Synthese und Struktur. Ein Beispiel für die Variabilität weicher molekularer Strukturparameter unter dem Einfluß der Kristallgitterkräfte

Borabenzene Derivatives. 25 [1]. Methylbis(1-methylboratabenzene)indium: Synthesis and Structure. An Example for the Variability of Soft Structural Parameters in the Crystalline Environment The new boratabenzene derivative InMe(C₅H₅BMe)₂ has been synthesized from 2-(Me₃Sn)C₅H₅BMe and InMe₃. The compound proves fluxional on the nmr time scale with average C_2v symmetry in solution. An x-ray structure determination shows the existence of four molecules in the asymmetric unit differing mainly in the bonding geometry of the metal atoms with respect to the eight symmetrically independent boratabenzene ligands. Thus the dynamical behaviour in solution is reflected in the solid state by the soft structural parameters of the indium-ring coordination, with their variability exceeding the standard deviations of the corresponding individual observations by an order of magnitude.