Tetranuclear Silver(I) Clusters Showing High Ionic Conductivity in a Bicontinuous Cubic Mesophase

Abstract

The synthesis and characterization of tetranuclear silver triazole metallomesogens, [Ag4(L(4)-C(n))6][BF4]4 (L(4)-C(n) = 4-alkyl-1,2,4-triazoles where C(n) stands for C(n)H(2n+1) with n = 12, 14, 16, and 18), are reported. Upon heating, a phase transition sequence of Cr → SmC → Cub → SmA → isotropic liquid is observed for all of these compounds. Depending on the alkyl chain length, two types of cubic phases are found in this series of compounds. Those with shorter alkyl chains (n = 12 and 14) exhibit a micellar cubic phase, whereas long alkyl chains (n =16 and 18) show a bicontinuous cubic phase. Superior ionic conductivity at the bicontinuous cubic mesophase for [Ag4(L4-C16)6][BF4]4 is observed because of the presence of a three-dimensional ion-transporting channel. Doping a small amount of AgBF4 enhances the ionic conduction dramatically, presumably via promotion of the migration of Ag(I) ions in the channels.

Crystallization of Poly(ethylene oxide) with a Well-Defined Point Defect in the Middle of the Polymer Chain

“…For PEO 22 , trans -2-[3-(4- tert -butylphenyl)-2-methyl-2-propenylidene]­malononitrile (DCTB) was used as matrix and silver­(I) trifluoro­acetate (AgTFA) as salt. The matrix–salt system was changed to 1,8,9-anthracenetriol (dithranol) and sodium trifluoroacetate (NaTFA) for PEO 11 -TR-PEO 11 since triazoles can react with silver salts. , …”

“…The matrix−salt system was changed to 1,8,9anthracenetriol (dithranol) and sodium trifluoroacetate (NaTFA) for PEO 11 -TR-PEO 11 since triazoles can react with silver salts. 41,42 Polarized Optical Microscopy. Polarized optical microscopy (POM) was studied with an Axioplan 2 imaging microscope from Carl Zeiss Jena equipped with a LINKAM THMS 600 hot stage.…”

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

“…These crystals intrinsically can exhibit the phase transition to the liquid crystalline state with an increase in the temperature as metallomesogens [67], and their mesomorphic property has been investigated [41][42][43][44][45][46]51,68,69]. Ionic conductivity [70,71], photoluminescence [39,54,62,63], catalytic activity [47,48], thin-film formation ability [39,69], and behavior as preparative precursor for metal nanoparticles [43,57] have been explored recently.…”

On Potential Application of Metallomesogen Materials in Liquid Crystal Displays

“…In recent years a great variety of MOM materials with photoluminescence and water-free proton conduction, electroluminescence, magnetic and electric properties have been synthesised. Some scientific and patent literature are also reported on the potential applications of calamitic and discotic MOMs as dichroic dyes, non-linear optics, thermal recording, thermochromism, passive optical filters, photo-sensing, laser addressing, optical and thermal recording, polarizing flms, radiation absorbing films, ferroelectricity, ferromagneticity, electroconductivity, reaction catalysts, LC intermediates, ink jet and security printing, medicinal and agricultural components [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”