Publications by authors named "Soumik Laha"

To realize the aim of easy and accurate detection of ammonia and picric acid (PA) in both aqueous and vapor phases based on function-oriented investigation principles, in the present study, we include a luminescent performance with recognition performance, taking into account the application conditions. Zn(II) ions with luminescence qualities and an amine-substituted imidazole moiety with selective recognition properties towards picric acid and ammonia are coupled to generate a novel 1D luminous Zn(II) coordination polymer, Zn-CP [{Zn(II)( 2-ABZ)2(2-BDC)}].MeOH]∞, where 2-ABZ and 2-BDC stand for terephthalic acid and protonated 2 aminobenzimidazole, respectively.

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Background: Betulinic acid (BA) has been well investigated for its antiproliferative and mitochondrial pathway-mediated apoptosis-inducing effects on various cancers. However, its poor solubility and off-target activity have limited its utility in clinical trials. Additionally, the immune modulatory role of betulinic acid analogue in the tumor microenvironment (TME) is largely unknown.

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In the present study, one mononuclear Cu(II) [CuL(SCN)] (1) and one mononuclear Co(II) [CoLN] (2) complexes, with a Schiff base ligand (HL) formed by condensation of 2-picolylamine and salicylaldehyde, have been successfully developed and structurally characterized. The square planer geometry of both complexes is fulfilled by the coordination of one deprotonated ligand and one ancillary ligand SCN(1) or N(2) to the metal centre. Binding affinities of both complexes with deoxyribonucleic acid (DNA) and human serum albumin (HSA) are investigated using several biophysical and spectroscopic techniques.

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In the current study, one new quercetin-based Zn(II) complex [Zn(Qr)(CNNCN)(HO)] (Complex ) which is developed by condensation of quercetin with ZnCl in the presence of NaN(CN) and Cu(II) complex [Cu(Qr)N(CHOH)(HO)] (complex ) which is developed by the condensation reaction of quercetin and CuCl in presence of NaN are thoroughly examined in relation to their use in biomedicine. The results of several spectroscopic studied confirm the structure of both the complexes and the Density Functional Theory (DFT) study helps to optimize the structure of complex 1 and 2. After completion of the identification process, DNA and Human Serum Albumin (HSA) binding efficacy of both the investigated complexes are performed by implementing a long range of biophysical studies and a thorough analysis of the results unveils that complex has better interaction efficacy with the macromolecules than complex .

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Hepatocellular carcinoma (HCC) is a leading cause of death globally. Even though the progressive invention of some very potent therapeutics has been seen, the success is limited due to the chemotherapeutic resistance and recurrence in HCC. Advanced targeted treatment options like immunotherapy, molecular therapy or surface-engineered nanotherapeutics could offer the benefits here owing to drug resistance over tumor heterogenicity.

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A new quercetin-based iron(III) cationic complex [Fe()Cl(HO)(MeO)] (complex ) is created in the current study by condensation of quercetin with ferric chloride in the presence of EtN. Comprehensive spectroscopic analysis and conductometric measurement are used to pinpoint complex . The generated complex's +3-oxidation state has been verified by electron paramagnetic resonance (EPR) research.

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The current study shows that Schiff base HL, ()-2,4-dibromo-6-(((piperidin-2-ylmethyl)imino)methyl)phenol, can be used successfully as a selective chemosensor for Zn(II) and Ni(II) among several competing cations in purely aqueous and semi-aqueous media. Under UV light in methanol-water (9 : 1) HEPES buffer, the receptor gives its response by changing its color to cyan color in the presence of Zn(II) and to bluish cyan color in the presence of Ni(II). Surprisingly, the chemosensor can only reliably identify Zn(II) in a hundred percent aqueous medium by changing its color to light yellow.

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In the present work we have developed one mononuclear Zn(II) complex [Zn(L)(H2O)] (Complex 1) by utilizing a tetracoordinated ligand HL, formed by simple condensation of 2, 2 dimethyl 1,3 diamino propane and 3- ethoxy salicylaldehyde and one newly designed mononuclear Co (III) complex [Co(L)(L1)] (complex 2) by utilizing (HL) and 3- ethoxy salicylaldehyde(HL1) as an ancillary ligand. The newly developed complex have been spectroscopically characterized. An interesting phenomenon has been noticed that in presence of ancillary ligand, the solubility in buffer solution and the thermal stability of complex comparatively increases than .

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Two fluorescence active bromoaniline-based Schiff base chemosensors, namely, ()-4-bromo-2-(((4-bromophenyl)imino)methyl)phenol ( ) and ()-2-(((4-bromophenyl)imino)methyl)phenol ( ), have been employed for the selective and notable detection of Cu and Zn ions, respectively, with the simultaneous formation of two new metal complexes [Cu(L)] and [Zn(L)] . X-ray single crystal analyses indicate that complexes and are tetra-coordinated systems with substantial CH..

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