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Cyclic organohydroborate complexes of metallocenes:Part VI. Syntheses and structures of Cp 2M{(μ-H) 2BR 2} (M=Ti, Nb; R 2=C 4H 8, C 5H 10, C 8H 14)

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
627
Issue
1
Identifiers
DOI: 10.1016/s0022-328x(01)00727-6
Keywords
  • Titanocene
  • Niobocene
  • Organohydroborates
  • Hydridoborates
  • Crystal Structures

Abstract

Abstract The complexes, Cp 2M{(μ-H) 2BC 4H 8} ( 1: M=Ti; 2: M=Nb), Cp 2M{(μ-H) 2BC 5H 10} ( 3: M=Ti; 4: M=Nb), and Cp 2M{(μ-H) 2BC 8H 14} ( 5: M=Ti; 6: M=Nb), were prepared from the reactions of Cp 2MCl 2 with the organohydroborate salts, K[H 2B 2(μ-H)(μ-C 4H 8) 2], K[H 2BC 5H 10], and K[H 2BC 8H 14], respectively. In these reactions, the transition metal is reduced from M(IV) to M(III), producing 17-electron, paramagnetic titanocene complexes ( 1, 3 and 5) and eighteen electron, diamagnetic niobocene complexes ( 2, 4 and 6). Single crystal X-ray structures of 1– 6 were determined. The molecular structure of Cp 2Nb{(μ-H) 2BH 2} ( 7) was redetermined using modern CCD techniques.

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