Monolayer behaviour of monovalent and divalent salts of long-chain alkylammonium [Ni(dmit)2] and alkylammonium [Ni(mnt)2]

Molecular Orientation in Langmuir Monolayers Containing the [M(dmit)2]n-Anion Determined from Surface Pressure and Surface Potential Isotherms

“…The magnitude of the [M(dmit) 2 ] n - anion was considered by Gupta et al, and following their calculations it can be approximated as a rectangular box, of dimensions 16.1 Å × 6.3 Å × 3.2 Å. An approximate value for the area occupied by the 1,3-didodecylimidazolium (DDI) counterion can be obtained by assuming that each alkyl chain is vertically oriented, therefore occupying an area of 18.6 Å 2 .…”

“…It was argued by Gupta et al that in their alkylammonium salts, the dmit anion rotated over the course of the isotherm from a flat lying configuration at the lift off area, to the vertical at the point of the transition to the plateau. However, this cannot be the case since during compression of a liquid expanded monolayer, the orientation of the film molecules remains effectively constant and the decrease in area is accommodated by the expulsion of water molecules from the surface phase into the bulk …”

Study of molecular arrangement of organized molecular films of charge–transfer complexes containing 1,3-dithiole-2-thione-4,5-dithiolate by in-plane and out-of-plane X-ray diffractions

“…Furthermore, the ac magnetic susceptibility and resistance of these films suggested the existence of a superconducting phase below 4 K [21]. Further, Gupta and co-workers reported detailed monolayer behavior of alkylammonium-metal(dmit) 2 and electrical conduction of the resultant LB film [22][23][24]. Bryce and Petty investigated the electrical conductivity of LB films of charge-transfer complexes containing dmit [25][26][27][28][29][30][31].…”

Generation of ultrashort pulses by two-component superradiance media

“…Gupta and coworkers reported that the film quality of some dialkyldimethylammonium-metal(dmit) 2 (metal = Pt, Pd or Ni) salts is improved with increasing the "waiting time (T w )", 4,5) however, they neither touched upon the conductivity improvement nor the driving force of the morphological change. In this paper, we report on the improvement of the in-plane conductivity of the 2C 14 -Au(dmit) 2 LB film with changing T w and briefly explain the driving force of the morphological improvement.…”

“…5,8) The chemical process proceeding at the air/water interface is considered to be the oxidation of the Au(dmit) 2 anions. In fact, the IR spectrum in the fingerprint region in the case of T w = 900 min is in good agreement with that for the 2C 14 -Au(dmit) 2 salts oxidized by iodine.…”