Browsing by Author "Haribabu, Jebiti"

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    Crystal structures of the Schiff base derivatives (E)-N′-[(1H-indol-3-yl)methylidene]isonicotinohydrazide ethanol monosolvate and (E)-N-methyl-2-[1-(2-oxo-2H-chromen-3-yl)ethylidene]hydrazinecarbothioamide
    (International Union of Crystallography, 2017-03-24) Saranya, Sivaraj; Haribabu, Jebiti; Bhuvanesh, Nattamai S.P.; Karvembu, Ramasamy; Gayathri, Dasararaju
    The crystal structures of two title Schiff base derivatives, C15H12N4O·C2H6O (1·EtOH) and C13H13N3O2S (2), were determined at 110 and 100K, respectively. In the crystal of compound 1·EtOH, the (E)-N′-[(1H-indol-3-yl)methylidene]isonicotinohydrazide and ethanol molecules are linked by O-H⋯O, N-H⋯O and N-H⋯N hydrogen bonds, forming a tape structure running along the b-axis direction. The tapes are weakly linked via a C-H⋯N interaction. In the crystal of compound 2, (E)-N-methyl-2-[1-(2-oxo-2H-chromen-3-yl)ethylidene]hydrazinecarbothioamide molecules are linked via N-H⋯O and C-H⋯O hydrogen bonds, forming a helical chain along the b-axis direction. The chains are further linked into a layer expanding parallel to (102) through C-H⋯S interactions.
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    Crystal structures of two hydrazinecarbo­thio­amide derivatives: (E)-N-ethyl-2-[(4-oxo-4H-chromen-3-yl)methyl­­idene]hydrazinecarbo­thio­amide hemi­hydrate and (E)-2-[(4-chloro-2H-chromen-3-yl)methyl­­idene]-N-phenyl­hydrazinecarbo­thio­amide
    (International Union of Crystallography, 2015-02-21) Gangadharan. Rajeswari; Haribabu, Jebiti ; Karvembu, Ramasamy ; Sethusankar, K
    The title compounds, C13H13N3O2S·0.5H2O, (I), and C17H14ClN3OS, (II), are hydrazinecarbothioamide derivatives. Compound (I) crystallizes with two independent molecules (A and B) and a water molecule of crystallization in the asymmetric unit. The chromene moiety is essentially planar in molecules A and B, with maximum deviations of 0.028 (3) and 0.016 (3) Å, respectively, for the carbonyl C atoms. In (II), the pyran ring of the chromene moiety adopts a screw-boat conformation and the phenyl ring is inclined by 61.18 (9)° to its mean plane. In the crystal of (I), bifurcated N - H⋯O and C - H⋯O hydrogen bonds link the two independent molecules forming A-B dimers with two R 12(6) ring motifs, and R 22(10) and R 22(14) ring motifs. In addition to these, the water molecule forms tetrafurcated hydrogen bonds which alternately generate R44(12) and R66(22) graph-set ring motifs. There are also π-π [inter-centroid distances = 3.5648 (14) and 3.6825 (15) Å] interactions present, leading to the formation of columns along the c-axis direction. In the crystal of (II), molecules are linked by pairs of N - H⋯S hydrogen bonds, forming inversion dimers with an R22(8) ring motif. The dimers are linked by C - H⋯π interactions, forming ribbons lying parallel to (210).
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    Effect of morphology and (Sn, Cr) doping on in vitro antiproliferation properties of hydrothermally synthesized 1D GaOOH nanostructures
    (Elsevier B.V., 2024-03-15) Pilliadugula, Rekha; Haribabu, Jebiti; Mohamed Subarkhan, Mohamed Kasim; Echeverria, Cesar; Karvembu, Ramasamy; Gopalakrishnan, N
    GaOOH powders of submicron dimensions were synthesized through a simple, surfactant-free hydrothermal synthesis at pH values of 7 and 14. Sn and Cr at concentrations of 2 mol% and 1 mol%, respectively, were successfully incorporated into a GaOOH lattice at pH = 7. The synthesized powders were characterized through XRD, SEM, UV-Vis spectroscopy, XPS, and PL spectroscopy to untangle their structural, morphological, optical, elemental, and compositional- and defect-level analyses, respectively. All samples were individually tested for their in vitro anti-proliferation activities against three human cancer cell line profiles, namely, lung carcinoma (A549), colon adenocarcinoma (LoVo), and hepatocellular carcinoma (HuH-7). The samples showed obtrusive anti-proliferation activity against the three cancer line profiles. An apoptotic cell killing mechanism was found in the studied samples after a successful analysis of various staining assays and flowcytometric analyses in the A549 cancer cell profile. Cr loading at 1 mol% enhanced the cancer cell inhibition property of GaOOH against all cancer cells investigated. Also, the morphology and doping levels were observed to have a collective effect on the anti-proliferation activity of GaOOH with specificity in treating certain cancer cells. © 2021 The Authors
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    Spectroscopic, anticancer and antioxidant studies of fluxional trans-[PdCl2(S-acylthiourea)2] complexes
    (Elsevier B.V., 2021-07-19) Dorairaj, Dorothy Priyanka; Haribabu, Jebiti; Chithravel, Vadivalagan; Vennila, Kailasam N; Bhuvanesh, Nattamai; Echeverria, Cesar; Hsu, Sodio C.N.; Karvembu, Ramasamy
    A library of palladium(II) acylthiourea complexes (1–6) of the type [PdCl2{C8H13N2OS(R)}2] [where R = C6H4CH3(o) (1), C6H5 (2), C6H4OCH3(p) (3), C6H4OC2H5(p) (4), C10H7 (5) or C6H5Cl(p) (6)] was synthesized and characterized by UV–Visible, FT-IR, 1H NMR, 13C NMR and ESI-Mass spectroscopy, and elemental analysis. Single crystal X-ray structure of complex 4 revealed the monodentate coordination of acylthiourea ligand through sulphur atom to the palladium ion in a trans fashion. In addition, variable-temperature (VT) NMR studies were performed to analyze the fluxional nature of complexes. The interaction of complexes with calf thymus (CT) DNA and BSA (bovine serum albumin) was analyzed by spectroscopic and molecular docking studies. The results inferred intercalation binding mode of the complexes with DNA. All the complexes exhibited good binding with BSA as well. Further, the complexes were found to act as good scavengers of DPPH as deduced from the antioxidant assay. In vitro cytotoxicity of the compounds against A549 (lung) cancer and HEK293 (human embryonic kidney) normal cell lines was investigated by MTT assay. Among the six complexes, complex 5 bearing a napthyl substitution in acylthiourea exhibited a remarkable activity against A549 cell line with an IC50 value of 14.8 µM and was more active than cisplatin (IC50 = 17.8 µM). On the other hand, it showed less toxicity on HEK293 cell line. The cell death mechanism was analyzed by AO/EB and DAPI staining, flow cytometry and Western blot investigations, which revealed that complex 5 could initiate cell death through apoptosis.