Chemical consequences of the polar axis in organic solid-state chemistry

Magnetodielectric coupling of a polar organic-inorganic hybrid Cr(II) phosphonate

“…The reason is twofold: first to explore the possible occurrence of interesting phenomena such as ferroelectricity or nonlinear optical effects found for other polar molecule based materials. 5 The second one resides in the fact that magnetodielectric coupling studies of polar materials are focused mainly on pure inorganic multiferroic metal oxides. [6][7][8][9][10][11] The target of this work is twofold: ͑1͒ to investigate the magnetodielectric coupling in a polar organicinorganic hybrid material and ͑2͒ to discuss the results in comparison with some well-known magnetodielectric compounds.…”

Polar Vector Property of the Stationary State of Condensed Molecular Matter

“…• orientational disorder of dipolar entities and the forms of twinning related to the spatial distribution of the polarization, we can, however, answer the aforementioned key question: for crystals expressing a polar morphology by their (hkl) faces, a mono-domain, i.e., a homogeneous polarization distribution, may be observed experimentally [5][6][7][8][9][10][11][12]. This is a kinetic effect due to the critical slowing down occurring in real growth that hinders the reversal transition into a bi-polar state, as predicted by statistical mechanics calculations [2,3] (Figure 1a).…”

“…If we exclude ionic systems (salts) to only consider neutral small molecules, there remain about 9% of the polar structures. Although twinning and disorder are currently addressed, we notice that only a small number of structural investigations have provided some knowledge on: (i) the absolute orientation of the polar axis in relation to the morphology [5][6][7][8][9][10][11][12]; and (ii) just in a few cases, the spatial distribution of the electrical polarization P el has been analyzed [13][14][15]. As a matter of fact, we do not know much about the polar domain states of (non-ferroelectric) molecular crystals.…”

Growth and Characterization of Promising Nlo Crystal: Meta Nitroaniline

“…Though, in the lack of these conventional hydrogen bonds, weaker interactions are answerable for crystal packing 16 . In the instance of nitroaniline derivatives, it was found that they usually associate through intermolecular hydrogen bonds between the -NH2 and -NO2 groups giving the development of infinite polar chains, which can be useful for the design of efficient NLO materials 17 . Here in the present study due to the lack of work spotted in the literature encouraged us to make the above-mentioned studies on Meta Nitroaniline (mNA) crystals were grown and subjected to various characterizations and results are reported.…”