Microwave-assisted synthesis, characterisation and mesomorphic investigations of novel disubstituted aroylhydrazones

Singh, Sachin Kumar; Kumar, Vijay; Singh, Hemant Kumar; Kanth, P. Chandra; Singh, B.

doi:10.1080/02678292.2015.1031717

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…1D). [22][23][24][25] In this work, we synthesized rigid, extended, mono-to tricatenar alkoxy systems derived from aroylhydrazones. The aroylhydrazone unit was extended in the p-benzoyl-position using imine linking group.…”

Section: Introductionmentioning

confidence: 99%

Tuning the thermotropic properties of liquid crystalline p-substituted aroylhydrazones

Singh

Nandi

et al. 2015

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Tuning the thermotropic properties of liquid crystalline p-substituted aroylhydrazones

Singh

Nandi

et al. 2015

RSC Adv.

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“…Table 2. Infrared, UV-visible spectral data of the ligands and complexes (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). 1 1660 2 3292, 3190 1640 3 3240 1712 1605 275 4 3286 1674 1605 280 300 328 5 3210 1713 1604 273 320 6 3186 1635 1605 270 342 374 7 3178 1713 1605 275 315 380 8 1598 509 663 295 324 390 9 1574 501 586 305 332 406 10 1566 470 509, 604 308 328 405 11 1574, 1604 516 617 305 365 400 12 1620, 1566 532 663 308 375 405 The 1 H NMR spectral data of the ligands and complexes are shown in the Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…Hydrazones are an important class of Schiff base ligands which exhibit several applications in pharmaceutical field due to their biological activities including antimicrobial, antifungal, antitumor, antitubercular properties [1][2][3][4][5]. Aroylhydrazones have been widely used as ligands in the preparation of a variety of transition metal complexes [6][7][8][9][10][11]. The aroylhydrazone moiety may coordinate to the metal through the keto or enol forms [3,12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Bioactive Cadmium (II) Complexes Derived from 4-Benzyloxybenzoylhydrazine with Different Aromatic Aldehydes

Ansary¹,

Mamun²,

Howlader³

2020

SJC

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The reactions of the ligand precursor 4-benzyloxybenzoylhydrazine (2) with cinnamaldehyde, salicylaldehyde, 2,4-dimethoxybenzaldehyde, 4-N,N dimethylaminobenzaldehyde, 4-methoxybenzaldehyde formed the ligands C 6 H 5 CH 2 OC 6 H 4 CONHN=CHR, where R=C 6 H 5 CH=CH, (3); C 6 H 4 (OH), (4); C 6 H 3 (OCH 3) 2 , (5); C 6 H 4 N(CH 3) 2 , (6); C 6 H 4 (OCH 3), (7), respectively. The ligand precursor 4-benzyloxybenzoylhydrazine (2) was synthesized by the condensation reaction of ethyl-4-benzyloxybenzoate (1) with hydrazine hydrate. Ethyl-4-benzyloxybenzoate (1) was synthesized by the reaction of ethyl-4-hydroxybenzoate and benzyl bromide dissolved in acetone in presence of anhydrous potassium carbonate. By the reactions of the synthesized ligands with cadmium(II) acetate, a series of complexes [(C 6 H 5 CH 2 OC 6 H 4 CONHN=CHR) 2 Cd] were obtained, where R=C 6 H 5 CH=CH, (8); C 6 H 4 (OH), (9); C 6 H 3 (OCH 3) 2 , (10); C 6 H 4 N(CH 3) 2 , (11); C 6 H 4 (OCH 3), (12). The complexes cannot be obtained via a template method. The compounds have been characterized by elemental analysis, conductivity measurements, UV-visible, FT-IR, 1 H NMR spectral studies. The conductivity measurement data revealed that the complexes are non-electrolytic in nature. The UV-visible data of the complexes suggested the tetrahedral geometry of Cd(II) ion. The antibacterial results of the ligands (3-7) exhibited very low or no activity against pathogenic bacteria viz. gram positive (Bacillus anthracis, Staphylococcus aureus, Bacillus megaterium) and gram negative (Shigella flexneri, Escherichia coli, Shigella shiga), whereas their corresponding complexes (8-12) exhibited activity against the aforementioned bacteria but less than the standard drug, kanamycine. This implies that the activity showed by the complexes is solely responsible for the presence of Cadmium (II) ion.

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“… Liquid crystal hydrazones were reported for the first time in 1993 by McCabe et al Since then, there have been some reports on liquid crystals based on hydrazone derivatives . In continuation of earlier studies, we have shown that aroylhydrazone forms a suitable core for the design of liquid crystals capable of undergoing lamellar smectic mesophases in mono alkoxy chain derivatives . Recently, we have shown that presence of nonflexible (imine) substituent at aryolhydrozone core leads to complete breaking of intermolecular hydrogen bonding and formation of SmA phase .…”

Section: Introductionmentioning

confidence: 95%

Molecular approach to phase transitions in a calamitic ester substituted aroylhydrazone liquid crystal

Nandi

Singh

et al. 2016

J Raman Spectroscopy

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Temperature dependent Raman and X-ray diffraction studies of a calamitic ester substituted aryolhydrazone liquid crystal (LC) system; N-[4-(4 -decyloxy)benzoyloxy benzylidene]-N -[4 -decyloxybenzoyl]hydrazine (DB2H) have been performed to investigate the molecular arrangement and intermolecular interaction environment in LC phase. X-ray diffraction study with the help of density functional theoretical study gives the information of molecular tilt angle in SmC layer. Prominent Raman signatures of crystal I → crystal II, crystal II → SmC and SmC → Isotropic phase transitions were identified in terms of changes in peak position and linewidth as well as Raman intensity. Analysis of Raman marker bands gives evidence of residual intermolecular hydrogen bonds between amide groups responsible for tilting arrangement in SmC phase.

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Microwave-assisted synthesis, characterisation and mesomorphic investigations of novel disubstituted aroylhydrazones

Cited by 10 publications

References 43 publications

Tuning the thermotropic properties of liquid crystalline p-substituted aroylhydrazones

Tuning the thermotropic properties of liquid crystalline p-substituted aroylhydrazones

Synthesis and Characterization of Bioactive Cadmium (II) Complexes Derived from 4-Benzyloxybenzoylhydrazine with Different Aromatic Aldehydes

Molecular approach to phase transitions in a calamitic ester substituted aroylhydrazone liquid crystal

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