C-13 NMR RELAXATION STUDIES OF 1/2 LICL-ETHYLALUMINUM DICHLORIDE SOLUTIONS

被引:6
作者
KELLER, CE
PIERSMA, BJ
MAINS, GJ
CARPER, WR
机构
[1] WICHITA STATE UNIV,DEPT CHEM,WICHITA,KS 67260
[2] HOUGHTON COLL,DEPT CHEM,HOUGHTON,NY 14744
[3] OKLAHOMA STATE UNIV,DEPT CHEM,STILLWATER,OK 74078
关键词
C-13 NMR RELAXATION STUDIES; ALKYL CHLORIDE COMPLEXES; ALUMINUM COMPLEXES; COUPLING CONSTANTS; CHEMICAL SHIFT ANISOTROPIES;
D O I
10.1016/0020-1693(94)04197-4
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A new room-temperature molten salt, 1:2 LiCl-ethylaluminum dichloride (LiCl-EtAlCl(2), f.p. about 178 K), is examined using C-13 relaxation methods at 7.05 T (-25 to +80 degrees C). The methylene carbon undergoes scalar relaxation of the 'second kind' as it is coupled to a faster relaxing (quadrupolar) nucleus. LiCl-EtAlCl(2), undergoes a significant liquid-state phase change between 5 and 15 degrees C as evidenced by observed changes in the relaxation properties of the methylene and methyl carbons and J(C-13-Al-27). The J(C-13-Al-27) coupling constants are 75 (-10 to +5 degrees C) and 11 Hz (15-65 degrees C), indicating a change in structure between 5 and 15 degrees C. Chemical shift anisotropies of 56 and 48 ppm are obtained for the methylene and methyl carbons in the EtAlCl(2), dimer part of the 1:2 LiCl-EtAlCl(2) solution.
引用
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页码:185 / 188
页数:4
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