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- W2034163097 abstract "Abstract 81 Br and 27 Al NQR were observed in AlBr 3 complexes with 4-XC 6 H 4 NO,(X = H, CI, Br, I, CH 3 , and C 2 H 5 ), C 6 H 5 COBr, (C 6 H 5 ) 2 CO, and (C 2 H 5 ) 2 O. In the 4-XC 6 H 4 NO 2 complexes, the 27 Al quadrupole coupling constants (QCC's) were well correlated with the Hammett er p 's of the para-substituents, i.e., electron-withdrawing groups caused reduction of the charge density of O-Al bonds which resulted in large 27 Al QCC's and vice versa. The temperature dependences of the 81 Br NQR frequencies and quadrupolar spin-lattice relaxation times showed that the 4-C 2 H 5 C 6 H 4 NO 2 and C 6 H 5 COBr complexes undergo phase transitions at 154 K and around 200 K, respectively, and show hindered rotation of the AlBr 3 groups at higher temperatures, and that the (C 2 H 5 ) 2 O complex reorients above ca. 120 K." @default.
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- W2034163097 date "1990-04-01" @default.
- W2034163097 modified "2023-09-25" @default.
- W2034163097 title "NQR Study of AlBr<sub>3</sub> Complexes with Donor-Acceptor O-Al Bond" @default.
- W2034163097 doi "https://doi.org/10.1515/zna-1990-3-408" @default.
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