Abstract
Reaction of MMe3 (M=Al, Ga) with one equivalent of NH2NPh2 affords a dimeric complex [Me2M-μ-N(H)NPh2]2 [M=Al (1), M=Ga (2)] as a mixture of trans and cis isomers. Purification of 1 and 2 by recrystallization gives only trans isomers 1a and 2a, respectively. Variable-temperature 1H-NMR studies reveal that both 1 and 2 in solution undergo trans→cis isomerization with free energy of activation (ΔGc‡) values of 15.9 for 1 and 18.3 kcal mol-1 for 2. The solid state structures of trans isomers 1a and 2a have been determined by single-crystal X-ray diffraction studies. The molecular geometries of 1a and 2a consist of a centrosymmetric and dimeric unit (M-N)2 with two bridging hydrazido groups and two terminal methyl groups bound to each metal atom. The two N-NPh2 groups are trans to each other with respect to the (M-N)2 core plane. The coordination geometry of both metal and nitrogen atoms are distorted tetrahedral.
Original language | English |
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Pages (from-to) | 162-167 |
Number of pages | 6 |
Journal | Journal of Organometallic Chemistry |
Volume | 592 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1999 Dec 25 |
Externally published | Yes |
Bibliographical note
Funding Information:We are grateful to the Korea Science and Engineering Foundation for financial support of this work.
Keywords
- 1,1-Diphenylhydrazine
- Dimeric
- Hydrazidoalane
- Hydrazidogallane
- Precursor
ASJC Scopus subject areas
- Biochemistry
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry