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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

As an exercise in crystal engineering, preparations and low-temperature X-ray structures are reported for three ionic solids of general formula BH + (MeSO 2 ) 2 N − , where BH +  is 2,4,6- triaminopyrimidinium (compound 1, triclinic, space group P1, Z = 2), 2,6-diaminopyridinium (2, monoclinic, C2/c, Z = 8), or 2,4-diaminopyrimidin-6(1H)-on-3-ium (3, monoclinic, P2 1 /c, Z = 4). As a common feature, the onium cations in question exhibit a trifunctional hydrogen-bond donor sequence H-N-C-N(H)-C-N-H that is complementary to a W-shaped O-S-N-S-O fragment of the anion. Consequently, each structure displays a [DDD:AAA] three-point hydrogen-bond pattern formed by two lateral N-H···O bonds and a central N-H···N interaction. This grouping is integrated as a robust supramolecular synthon into two-dimensional (1, 2) or three-dimensional (3) hydrogen-bond networks, in which all good donors and all good acceptors are involved (excepting one S=O group in 2). In structure 1, the approximately planar cation-anion layers are perfect mosaics composed of 6-membered pyrimidine heterocycles and seven crystallographically independent types of 8-, 10-, 12- or 24-membered rings based upon hydrogen bonding. In contrast, the corresponding layers in structure 2 are marred by large 40-membered voids; in order to achieve dense packing, the imperfect layers adopt a strongly corrugated shape and interpenetrate to form twofold interwoven and nearly planar double-layers. Each structure features close C-H···O contacts consistent with weak hydrogen bonding; in the layer structures 1 and 2, some of these interactions serve as links between adjacent or interwoven layers.

zeitschrift für naturforschung b

Polysulfonylamine, CLXVII [1]. Wasserstoffbrücken in kristallinen Onium-dimesylamiden: Ein robustes Dreipunktmuster als Bestandteil eines 2D-, eines zweifach verwobenen 2D- und eines 3D-Wasserstoffbrücken-Netzwerks / Polysulfonylamines, CLXVII [1]. Hydrogen Bonding in Crystalline Onium Dimesylamides: A Robust Three-Point Pattern Integrated into a 2D, a Twofold Interwoven 2D, or a 3D Hydrogen-Bond Network