Ionic bonding driven unusual crystal growth of tubular organic nitrate salts

Ghalsasi, Prasanna S.; Vishwakarma, Ashok K.

doi:10.1039/b920059b

Cited by 2 publications

(4 citation statements)

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“…Unusual crystal growth from Al(NO 3 ) 3 directed gel oozes hair-like crystal morphology for AnHNO 3 -b 1 , a work reported previously by our group . Both AnHNO 3 -b 1 and AnHNO 3 -a 1 , show similar crystal packing and the same orthorhombic Pbca space group, Z = 8 (Figure S5 and Table S2, Supporting Information).…”

supporting

confidence: 76%

“…Here thin hairlike crystals were obtained from a gel mediated method (Scheme 2, Supporting Information). Single crystal X-ray diffraction reveals both these pathways for aniline (a 1 and b 1 ), para -methyl aniline (a 2 and b 2 ), and para -ethyl aniline (a 3 and b 3 ) showed a systematic relative change in the position of the cation with respect to the nitrate anion. Figure shows the nitrate anion maintains hexagonal array and helps in generating chirality in the structure by distinct changes in the position of the cation.…”

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confidence: 98%

“…Unusual crystal growth from Al(NO 3 ) 3 directed gel oozes hair-like crystal morphology for AnHNO 3 -b 1 , a work reported previously by our group. 26 Both AnHNO 3 -b 1 and AnHNO 3 -a 1 , show similar crystal packing and the same orthorhombic Pbca space group, Z = 8 (Figure S5 and Table S2, Supporting Information). Similarly, two different morphologies (a 3 and b 3 ) for para-ethyl anilinium nitrate (Figure 4) were observed with a space group (orthorhombic, P2 1 2 1 2 1 ).…”

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confidence: 99%

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Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO₃

Mande

Ghalsasi

2015

Crystal Growth & Design

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Observation and creation of a pro-chiral center is a prerequisite in chemical synthesis for generating chiral structures. On the other hand, temporary and reversible generation of chiral or polar structures using physical forces such as electricity is a need of present technology for observing nonlinear behavior. Thus, one can synthesize a pro-polar structure, akin to a pro-chiral center using chemical interactions, for facilitating physical forces in generating chiral/polar structures, a novel way for designing molecular materials. At room temperature, the structure of KNO 3 and anilinium nitrate (AnHNO 3 ) is centrosymmetric, although the latter showed molecular properties in the form of distinct helical NH•••O hydrogen bonding to generate a dipole moment, which in turn gets canceled due to the formation of antiparallel double helical chains. We could separate these helical chains of NH•••O hydrogen bonding, by chemical design, synthesis of analogues molecules (para-ethyl anilinium nitrate), and crystallization through a gel as well slow evaporation technique, to obtain a pro-polar and chiral structure with molecular ferroelectric behavior. Thus, creation of a pro-polar structure, presented here by modifying the cation in KNO 3 to observe room temperature ferroelectric behavior, will help in designing novel molecular ferroelectric materials.

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confidence: 76%

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confidence: 98%

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confidence: 99%

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Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO₃

Mande

Ghalsasi

2015

Crystal Growth & Design

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“…To the best of our knowledge, profuse gas hydrate fibers on a hydrate-free substrate were not reported elsewhere. Whisker-like crystal growth occurs in several other systems, including salts such as potassium chloride grown from porous glass filters, , or some organic compounds , often grown from porous powders or glass filters under strong temperature gradients. Some metals also produce fibers .…”

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Crystal Dewetting at the Water–Guest Interface in Macropores Sidesteps the Hydrate Mass-Transfer Bottleneck

Venet

Bouriat

Yusufujiang

et al. 2023

Crystal Growth & Design

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Unprecedented massive growth of fibrous cyclopentane hydrate on an activated carbon was shown recently to circumvent the mass-transfer bottleneck caused by hydrate crust at guest−host interfaces. Here, we generalize to other carbons and to porous silicas, confirming hydrate formation in surface macropores. Experiments with hydrophilic or -phobic porous substrates and with single glass capillary model pores elucidate the growth process. Surprisingly, wettability is of indirect importance. Detailed observation of unlimited single fibers with the better optical access and well-defined geometry of the glass model pores reveals the growth mechanism: crystal dewetting at pinned guest−host interfaces, in surface macropores in the case of porous substrates, where hydrophobicity serves only indirectly, to conduct the guest to the active interface. Fiber growth is closely analogous to the dewetted Bridgman process observed decades ago in microgravity. "Micro" or negligible gravity is provided here by the small size of the pores compared to the capillary length. Transposing the theory to the present system, we correlate fiber diameter and dynamic contact angles on the fiber and the pore wall, which in turn depend on the growth rate, hence on the supercooling. The model prescribes for generalization to further combinations of guest and porous substrates.

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Ionic bonding driven unusual crystal growth of tubular organic nitrate salts

Cited by 2 publications

References 12 publications

Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO₃

Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO₃

Crystal Dewetting at the Water–Guest Interface in Macropores Sidesteps the Hydrate Mass-Transfer Bottleneck

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Ionic bonding driven unusual crystal growth of tubular organic nitrate salts

Cited by 2 publications

References 12 publications

Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO3

Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO3

Crystal Dewetting at the Water–Guest Interface in Macropores Sidesteps the Hydrate Mass-Transfer Bottleneck

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Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO₃

Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO₃