English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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.

NQR Study of AlBr 3 Complexes with Donor-Acceptor O-Al Bond