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

The crystal structure of [C(NH 2 ) 3 ]HgBr 3  was determined at room temperature: monoclinic, space group C2/c, Z = 4, a = 775.0(2), b = 1564.6(2), c = 772.7(2) pm, β = 109.12(2)°. In the crystal, almost planar HgBr3 -  ions are connected via Hg ··· Br bonds, resulting in single chains of trigonal bipyramidal HgBr 5  units which run along the c direction. [C(NH 2 ) 3 ]HgI 3  was found to be isomorphous with the bromide at room temperature. The temperature dependence of the halogen NQR frequencies (77 &lt; 77K &lt; ca. 380) and the DTA measurements evidenced no phase transition for the bromide, but a second-order phase transition at (251 ± 1) K (T c1 ) and a first-order one at (210 ± 1) K for the iodide. The transitions at  T c2  are accompanied with strong supercooling and significant superheating. The room temperature phase (RTP) and the intermediate temperature phase (ITP) of the iodide are characterized by two  127 I (m=1/2↔3/2)  NQR lines which are assigned to the terminal and the bridging I atoms, respectively. There exist three lines in the lowest temperature phase (LTP), indicating that the resonance line of the bridging atom splits into two. The signal intensities of the  127 I (m =1/2↔3/2)  NQR lines in the LTP decrease with decreasing temperature resulting in no detection below ca. 100 K. The  127 I (m=1/2↔3/2)  NQR frequency vs. temperature curves are continuous at  T cl ,  but they are unusual in the LTP. The  T 1  vs.  T curves of  1 H NMR for the bromide and iodide are explainable by the reorientational motions of the cations about their pseudo three-fold axes. The estimated activation energies of the motions are 35.0 kJ/mol for the bromide, and 24.1, 30.1, and 23.0 kJ/mol for the RTP, FTP, and LTP of the iodide, respectively

zeitschrift für naturforschung a

Studies of Structure and Phase Transition in [C(NH 2 ) 3 ]HgBr 3  and [C(NH 2 ) 3 ]HgI 3  by Means of Halogen NQR,  1 H NMR, and Single Crystal X-Ray Diffraction