TY - JOUR
T1 - Weakly coordinating nature of a carborane cage bearing different halogen atoms. Synthesis and structural characterization of icosahedral mixed halocarborane anions, 1-H-CB11Y5X6- (X, Y = Cl, Br, I)
AU - Tsang, C. W.
AU - Yang, Q.
AU - Sze, E. T.P.
AU - Mak, T. C.W.
AU - Chan, D. T.W.
AU - Xie, Z.
PY - 2000/12/11
Y1 - 2000/12/11
N2 - Mixed halocarborane anions, 1-H-CB11Y5X6- (X, Y = Cl, Br, I), have been prepared by treatment of [Me3NH]-[1-H-CB11H5X6] (X = Cl, Br, I) with proper halogenating reagents at 180-220 °C in a sealed tube in high yield. These new anions are fully characterized by 1H, 13C, and 11B NMR, IR, and negative-ion MALDI MS spectroscopy. Some are further confirmed by single-crystal X-ray analyses. The weakly coordinating nature of these anions is probed by 29Si chemical shifts of the resulting Pri3Si(1-H-CB11Y5X6) compounds. The results suggest that the coordinating ability of these anions is mainly dependent on the substituents at 7-12 positions (namely, X atoms), and the contribution from the upper belt substituents Y is relatively small. These suggestions are consistent with the results obtained from the structural study of silver salts of mixed halo- and perhalocarborane anions.
AB - Mixed halocarborane anions, 1-H-CB11Y5X6- (X, Y = Cl, Br, I), have been prepared by treatment of [Me3NH]-[1-H-CB11H5X6] (X = Cl, Br, I) with proper halogenating reagents at 180-220 °C in a sealed tube in high yield. These new anions are fully characterized by 1H, 13C, and 11B NMR, IR, and negative-ion MALDI MS spectroscopy. Some are further confirmed by single-crystal X-ray analyses. The weakly coordinating nature of these anions is probed by 29Si chemical shifts of the resulting Pri3Si(1-H-CB11Y5X6) compounds. The results suggest that the coordinating ability of these anions is mainly dependent on the substituents at 7-12 positions (namely, X atoms), and the contribution from the upper belt substituents Y is relatively small. These suggestions are consistent with the results obtained from the structural study of silver salts of mixed halo- and perhalocarborane anions.
UR - http://www.scopus.com/inward/record.url?scp=0034638853&partnerID=8YFLogxK
U2 - 10.1021/ic000354r
DO - 10.1021/ic000354r
M3 - Article
C2 - 11151389
AN - SCOPUS:0034638853
SN - 0020-1669
VL - 39
SP - 5851
EP - 5858
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 25
ER -