Zhang, Yi-Qi published the artcileUnusual Deprotonated Alkynyl Hydrogen Bonding in Metal-Supported Hydrocarbon Assembly, COA of Formula: C18H10, the publication is Journal of Physical Chemistry C (2015), 119(17), 9669-9679, database is CAplus.
The authors demonstrate that terminal alkynyl moieties represent powerful functional groups for driving thermally stable, on-surface supramol. structure formation on a reactive substrate. Through a combination of scanning tunneling microscopy, XPS spectra, near-edge X-ray absorption-fine-structure spectra, and d. functional theory calculations, the mol.-surface interaction and self-assembly of two prototypical hydrocarbon species on Cu(111) were investigated. For 1,3,5-tris(4-ethynylphenyl)benzene (Ext-TEB) adsorption at low temperature (200 K) resulted in nonassembling, conformationally adapted intact species. Deprotonation of the terminal alkyne moieties, taking place at temperatures ranging from 300 to 350 K, triggered the formation of room-temperature stable, close-packed supramol. islands. Through DFT calculations, the stabilizing interaction was identified as a trifurcated ionic C-H···π-δ hydrogen bonding between the π-system of the ionic alkynyl groups and methine moieties of nearby benzene rings, providing an energy gain of 0.26 eV/mol. upon network formation. Robust assemblies result from the combination of this weak directional attraction with the strong surface anchoring also provided by the alkynyl groups. The generality of this ionic hydrogen-bonding type is demonstrated by the observation of low-dimensional assemblies of 9,10-diethynyl-anthracene on the same surface, consistently explained with the same type of interaction.
Journal of Physical Chemistry C published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C26H26N4O7, COA of Formula: C18H10.
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem