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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Normal coordinate analyses for the 24 mixed halogenohexaborates B 6 X n Y 6-n  2- , n = 1—5, Χ ≠ Y = Cl, Br, I, including the pairs of geometric isomers for n = 2, 3, 4 have been performed, based on a general valence force field. Using the bond lengths and force constants for the homoleptic species B 6 X 6  2- , which with respect to the B 6  cage are weighted standardized, the calculated frequencies are in good agreement with observed IR and Raman bands. The boronhalogen stretching vibrations for symmetric molecular axes correspond with the Ra(IR) bands of the homoleptic compounds: ClB 6 Cl 327 (515), BrB 6 Br 207 (430), IB 6 I 152 (394) cm -1 . As a characteristic feature the mixed halogeno clusters exhibit bands with nearly averaged frequencies from asymmetrical axes: ClB 6 Br 261 (487), ClB 6 I 227 (473), BrB 6 I 178 (409) cm -1 . This complete vibrational coupling is confirmed by properly balanced potential energy distribution on BX and BY bonds. There is a slight influence of the different substituents on the internal modes of the B 6  cage (pseudo-O h ), observed in the sequence A 1g &amp;gt;T 1u &amp;gt; E g &amp;gt;T 2g  in the region 1220-740 cm -1 . The bands are shifted about 100 cm -1  with increasing mass of halogen, broadened by boron isotopomers (max. 60 cm -1 ), and degenerate vibrations are split by lowered point and site symmetry up to 100 cm -1 .

zeitschrift für naturforschung b

Schwingungsspektren und Normalkoordinatenanalyse der heteroleptischen Halogenohexaborate B 6 X n Y 6-n  2- , n = 1-5; Χ ≠ Υ = Cl, Br, I / Vibrational Spectra and Normal Coordinate Analysis of the Heteroleptic Halogenohexaborates B 6 X n Y 6-n  2- , n = 1— 5; Χ ≠ Y = Cl, Br, I