Conductive Hybrid Crystal Composed from Polyoxomolybdate and Deprotonatable Ionic-Liquid Surfactant

Abstract

A polyoxomolybdate inorganic-organic hybrid crystal was synthesized with deprotonatable ionic-liquid surfactant. 1-dodecylimidazolium cation was employed for its synthesis. The hybrid crystal contained δ-type octamolybdate (Mo8) isomer, and possessed alternate stacking of Mo8 monolayers and interdigitated surfactant bilayers. The crystal structure was compared with polyoxomolybdate hybrid crystals comprising 1-dodecyl-3-methylimidazolium surfactant, which preferred β-type Mo8 isomer. The less bulky hydrophilic moiety of the 1-dodecylimidazolium interacted with the δ-Mo8 anion by N–H···O hydrogen bonds, which presumably induced the formation of the δ-Mo8 anion. Anhydrous conductivity of the hybrid crystal was estimated to be 5.5 × 10−6 S·cm−1 at 443 K by alternating current (AC) impedance spectroscopy.

Amplified Spontaneous Emission and Optical Gain in Organic Single Crystal Quinquethiophene

“…Therefore, the charge mobility in organic materials needs to be improved [13] for its potential applications in high performance devices such as OLEDs, photodetectors, and solid state lasers. One of the characteristics that can enhance charge mobility is the purity and crystal nature of the semiconductor materials [14]. However, a particular class 2 of 10 of organic copolymers and co-oligomers demonstrates molecular crystal structure with a higher charge mobility as compared to other organic materials [15].…”

Isomerization-induced introduction of metal cations into polyoxomolybdate-surfactant hybrid crystals

“…POMs have been hybridized with structure-directing surfactants [14][15][16] to obtain inorganic-organic hybrid crystals [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. The POM-surfactant hybrid crystals enable fine tuning of the structure and function by changing the combination of POM anion and surfactant cation.…”

“…The POM-surfactant hybrid crystals enable fine tuning of the structure and function by changing the combination of POM anion and surfactant cation. Some of them exhibit electric [25] and proton [26,27] conductivities.…”

Conductive Supramolecular Architecture Constructed from Polyoxovanadate Cluster and Heterocyclic Surfactant

“…The spectrum showed a suppressed half circle in the high-and medium-frequency regions and a slightly inclined line in the low-frequency region. The Nyquist spectrum was fitted based on an equivalent circuit shown in Figure 6a (inset) [45][46][47]. The red line represents simulated data with the equivalent circuit, which successfully reproduced the measured Nyquist spectrum.…”

“…Heteropolyacids, Keggin-type POMs with a proton as counter cation, have been investigated as high proton conductors [20][21][22][23][24][25][26]. Such POMs have been successfully hybridized by surfactant cations to form inorganic-organic hybrids [27][28][29][30][31][32][33][34][35] and single crystals [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. These polyoxometalate-surfactant hybrids allow various combinations of the ionic components, leading to precise engineering of the structure and function.…”