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 structures of seven (pyrazinecarbonyl)hydrazone mono-substituted benzaldehyde derivatives, N 2 C 4 H 3 CONHN=CHC 6 H 4 X ( 1 : X = CN, OMe, OEt or NO 2 ) are reported. In all cases extensive intermolecular C–H · · · X (X = O, N or π-ring) hydrogen-bonding is present in which the nitrogen atom of  p -CN and one oxygen atom of  o -NO 2  substitutents act as hydrogen-bond acceptors and C–H bonds of the methyl groups of the  p -OME and  m -OEt substituents act as hydrogen-bond donors. While the  m -OMe substituted compound exhibits only one-dimensional connectivity in the form of face to face ribbons of molecules two-dimensional layer connectivity is observed in all other cases. If, however, π · · · π interactions and, in the case of ( 1 : X =  m -OEt) C–H · · · N and C–H · · · π-ring contacts, which arise between the layers as they are stacked, are taken into account three-dimensional connectivity is the norm for the layer structures except for that of ( 1 : X = o-Et).

Structures of (pyrazinecarbonyl)hydrazones of substituted benzaldehydes: supramolecular arrangements generated by various intermolecular contacts