2,4,6-Trimethylpyridinium perchlorate: Polar properties and correlations with molecular structure of organic–inorganic hybrid crystal

Unexpected behaviour in derivatives of Barluenga's reagent, Hal(Coll)2X (Coll = 2,4,6-trimethyl pyridine, collidine; Hal = I, Br; X = PF6, ClO4& BF4)

“…intensities of the new phase were consistent with the previously reported structure of collidinium perchlorate, 39 but the structure determined for collidinium bromide † was not consistent with the remaining, unindexed peaks. However, it is quite likely that single crystals from solution would have a different structure to powder prepared by decomposition.…”

Discrete Molecular Copper(II) Complex for Efficient Piezoelectric Energy Harvesting Above Room‐Temperature

“…A distinct dielectric anomaly was observed around 350 K with a peak value of 46.3 (at 1 kHz) in the plot of the real part of the dielectric permittivity ( ϵ ′) as a function of temperature (Figure S8, Supporting Information). The observed dielectric loss (tan δ ) of 1 is 0.748 at 1 kHz and both the values of ϵ ′ and tan δ are in the expected range of discrete molecular ferroelectrics reported in the literature [8–15] . Noteworthily this tanδ value is relatively higher as compared to that of the ferroelectric piezoceramics, which is a common scenario for molecular complexes.…”

“…In the differential scanning calorimetry (DSC) measurement of 1 , we observe a thermal anomaly at 354 K upon heating the sample (Figure S7, Supporting Information). The calculated values of enthalpy Δ H =1.69 J g −1 , entropy Δ S =2.70 J K −1 mol −1 and the broadness of the peak also suggest a second‐order phase transition [13–15] …”

Electrical properties and complex impedance analysis of K2ZnV2O7

“…The calculated transition enthalpy and entropy for second peak are DH 2 = 113.29 J mol -1 and DS 2 = 0.19 J K -1 mol -1 respectively. DS 2 value being \2 J K -1 mol -1 suggests a displacive mechanism [10].…”