268559-46-2Relevant academic research and scientific papers
Synthesis and reactivity of intramolecularly stabilized organotin compounds containing the C,N-chelating o-carboranylamino ligand [o-C2B10H10(CH2NMe2)-C,N]- (CabC,N). X-ray structures of (CabC,N)SnR2X (R = Me, X = Cl; R = Ph, X = Cl), (CabC,N)2Hg, and
Lee,Kim,Yoo,Ko,Cho,Kang
, p. 1695 - 1703 (2000)
A variety of organotin complexes, containing the o-carboranylamino ligand (CabC,N), has been prepared by the reaction of LiCabC,N (1) with organotin halides or tin tetrachloride. In this way, the tetraorganotin compound (CabC,N)SnMe3 (2), triorganotin halide (CabC,N)SnR2X (3: R = Me, X = Cl, 3a; R = Ph, X = Cl, 3b; R = Me, X = Br, 3c), diorganotin dichloride (CabC,N)SnPhCl2 (4), and monoorganotin trichloride (CabC,N)SnCl3 (5) have been synthesized and characterized. 1H and 119Sn NMR spectroscopy indicates that the tin center in the tetraorganotin compound 2 is tetracoordinate, whereas this center in mono-, di-, and triorganotin compounds 3-5 is pentacoordinate as a result of intramolecular Sn-N coordination. Complexes 3a,c were also formed by redistribution of (CabC,N)SnMe3 (2) with the corresponding Me2SnX2 (X = Cl, Br). The molecular structures of 3a,b were determined by X-ray analysis. As a result of the Sn-N interaction, the tin atoms in 3a,b exhibit distorted-trigonal-bipyramidal configurations with the electronegative atoms (N and Cl) in apical positions. The reaction of 2 equiv of 2 with HgCl2 resulted in transmetalation of (CabC,N)SnMe3 (2), giving the diorganomercury compound (CabC,N)2Hg (6). The structure of 6 was determined by an X-ray structural study. The mercury atom is four-coordinate, both nitrogen atoms being involved in intramolecular coordination. The reaction of 3c with Na in a 1:1 ratio afforded the bis(o-carboranylamino)distannane [(CabC,N)SnMe2]2 (7). The crystal structure of 7 was determined by an X-ray structural study. The two four-coordinate tin moieties exhibit approximately pseudotetrahedral geometries showing only negligible, if any, interactions between the tin atoms and the amino nitrogen atoms.
