Aluminum alkyl complexes containing guanidinate ligands
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Chemistry
- Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemistry
The synthesis and structures of new aluminum complexes incorporating guanidinate ligands (R{sub 2}NC(NR{prime}){sub 2}{sup {minus}}) are described. The reaction of {sup i}PrN{double_bond}C{double_bond}N{sup i}Pr with LiNR{sub 2} reagents yields Li[R{sub 2}NC(N{sup i}Pr){sub 2}] guanidinate salts, which are reacted in situ with AlCl{sub 3} or AlMe{sub 2}Cl to afford {l_brace}R{sub 2}NC(N{sup i}Pr){sub 2}{r_brace}AlCl{sub 2} (1a, R = Me; 1b, R = Et; 1c, R = {sup i}Pr; 1d, R = SiMe{sub 3}) or {l_brace}R{sub 2}NC(N{sup i}Pr){sub 2}{r_brace}AlMe{sub 2} (2a, R = Me; 2b, R = Et; 2c, R = {sup i}Pr), respectively. The reaction of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) with AlMe{sub 3} generates {l_brace}({mu}-hpp)-AlMe{sub 2}{r_brace}{sub 2} (3). Complexes 1a, 1d, and 3 have been characterized by X-ray crystallography. 1a and 1d adopt monomeric structures with symmetric chelated bidentate guanidinate ligands. Delocalization of the {minus}NR{sub 2} lone pair into the chelate ring is important for 1a but not for 1d, due to N-Si {pi}-bonding and steric crowding. The bicyclic structure of the hpp{sup {minus}} ligand enforces a dimeric {mu}-hpp{sup {minus}} structure for 3.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-88ER13935
- OSTI ID:
- 655371
- Journal Information:
- Organometallics, Vol. 17, Issue 15; Other Information: PBD: 20 Jul 1998
- Country of Publication:
- United States
- Language:
- English
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