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

Crystals of pyridinium tetrabromozincate and pyridinium tetrabromocadmate were obtained as monohydrates and anhydrous compounds. The crystal structure of metastable (C 5 H 5 NH) 2-  CdBr 4 ・H 2 O was determined at 300(2) K; triclinic space group P1̄ with a = 7.875(2), b = 8.151(1), and c = 16.356(2) Å, α = 79.260(10), β = 86.030(10), and γ = 61.440(10)°, Z = 2. All compounds except for stable (C 5 H 5 NH) 2 CdBr 4 ・H 2 O gave four  81 Br NQR lines at temperatures between 77 and around 325 K. The stable (C 5 H 5 NH) 2 CdBr 4 ・H 2 O undergoes a first-order phase transition at T C  = 116 K. Four  81 Br NQR lines below T C  merged into two with equal intensities above T C , indicating a 180° flip motion of water molecules in the r. t. phase. The  81 Br NQR lines of the two anhydrous compounds faded out around 325 K probably due to the reorientational motion of ZnBr 4  2−  or CdBr 4  2−  ions. The respective two  81 Br NQR lines of the hydrates exhibited anomalous positive temperature dependence. This is considered to be induced by a weakening in the interionic C-H・ ・ ・Br hydrogen bonds with increasing temperature. The DSC measurements of the anhydrous compounds have revealed phase transitions above r. t. The thermal behavior of (C 5 H 5 NH) 2 CdBr 4  is complicated by the formation of metastable forms.

zeitschrift für naturforschung b

NQR, DSC, and X-Ray Structure Studies of Pyridinium Tetrabromozincate and Pyridinium Tetrabromocadmate (C 5 H 5 NH) 2 MBr 4  · nH 2 O (M = Zn and Cd; n = 0, 1); Phase Transitions and Weak Hydrogen Bond Interactions