http://irgu.unigoa.ac.in/drs/handle/unigoa/5624 Thu, 20 Aug 2026 11:12:42 GMT 2026-08-20T11:12:42Z http://irgu.unigoa.ac.in/drs/handle/unigoa/7934 Dimeric and Monomeric Cu(II) 2,2'-bipyrimidine dicarboxylates in distorted environments: Structural Diversity, Magneto- Structural Correlations and Additives in Thermolysis of Ammonium Nitrate D'Souza, L.R.; Swapna, V.; Dhuri, S.N. Two new copper(II) compounds, dimeric [Cu sub(2)(fum)(bpm) sub(2)(H sub(2)O) sub(2)(NO sub(3)) sub(2)] 1 and monomeric [Cu(ida)(bpm)].4H sub(2)O 2 from rigid (fum sup(2-)) and flexible (ida sup(2-)) dicarboxylates were structurally characterized as undergoing Jahn- Teller tetragonal distortions (Z- out) to form distorted square-based pyramidal geometries (0 less than torque 5 less than 1) forming a herring- bone (1) and columnar supramolecular motifs (2). Wavefunction and molecular orbital analysis for 1 and 2 revealed strong in- plane Pi- covalency (K// less than K┴ and g// less than or equal to 2.3) with Z- out elongation and significant nephelauxetic electron delocalization. For 2, the bonding parameter hierarchy: Alpha 2 (0.741) less than beta 12 (0.860) less than beta 2 (1.066) verified a highly anisotropic, distorted coordination geometry defined by strong, cooperative in- plane sigma and Pi- bonding interactions alongside a stable, weakly mixed out- of- plane Pi- network driven by subtle orbital adjustments. EPR and magnetic studies confirmed that the unpaired electron resides in the dx sup(2)-y sup(2) orbital, revealing the coexistence of weak ferromagnetic and antiferromagnetic interactions (phi=+ 5.504 and J=-13.7 cm sup(-1)) for dimeric 1 and 2 behaving as a simple monomeric paramagnet. Thermogravimetric and Kinetic modeling (Coats- Redfern) presented positive Delta H and Delta G values affirming a non- spontaneous endothermic process of AN decomposition by 1 and 2, with lower activation energy. Thus, warranting the role of 1 and 2 as effective, low temperature additives for the thermolysis of AN via the ionic pathway. Thu, 01 Jan 2026 00:00:00 GMT http://irgu.unigoa.ac.in/drs/handle/unigoa/7934 2026-01-01T00:00:00Z http://irgu.unigoa.ac.in/drs/handle/unigoa/7929 Synthetic Transformation And Applications Of 5-Hydroxymethylfurfural And Cashew Nut Shell Liquid Kotkar, Gayatri Divakar Wed, 01 May 2024 00:00:00 GMT http://irgu.unigoa.ac.in/drs/handle/unigoa/7929 2024-05-01T00:00:00Z http://irgu.unigoa.ac.in/drs/handle/unigoa/7918 Synthesis and characterization of non-heme 3d metal compounds for selected applications Viegas, Jeffrey L. Fri, 01 Aug 2025 00:00:00 GMT http://irgu.unigoa.ac.in/drs/handle/unigoa/7918 2025-08-01T00:00:00Z http://irgu.unigoa.ac.in/drs/handle/unigoa/7895 Electrochemical impedance-based evaluation of antibiotic susceptibility in bacterial cells and biofilms grown on gold electrodes Cardozo, W.E.; Patel-Dhond, R. Catastrophic problem of antibiotic resistance is prevalent across the globe as it is triggered by bacterial survival mechanisms like exopolysaccharide layer (EPS) that serves as a protective slimy coating over bacteria, protecting it from environmental stress like drought, chemical stress and antibiotic effects and allowing it to survive and adapt to any environment. These biofilms are found in hospital-acquired infections seen in catheters of UTIs, valve insertions, implants, and incorrect antibiotic prescription, this is largely attributed to the ability of the exopolysaccharide layer in biofilm to confer antibiotic resistance. While traditional lab tests take 24-48 hours to identify fully developed biofilms, impedance can detect biofilms from early adhesion stages, the moment bacterial cells adhere to the surface, drastically decreasing time required for diagnosis. The rationale of this project focuses on mitigating biofilm's ability to develop as a biomedical diagnostic device in the detection and monitoring of bacterial cells. A hypothesis emphasizes speed and accuracy using real-time Electrochemical impedance (EIS) on gold screen-printed electrodes (Au-SPEs) to determine Minimum inhibition concentration (MIC) is 0.001mg/ml and Minimum biofilm eradication concentration (MBEC) is 5 mg/ml. Biofilm-forming bacterial cells using the electrochemical technique of impedance spectroscopy (EIS) and cyclic voltammetry (CV). This is a non-faradic, label-free antimicrobial testing method that rapidly tracks impedance changes or biofilm resistance during antibiotic exposure by analyzing impedance plots and peak variations across various antibiotic ranges. It also analyses method of inoculating bacterial biofilms in broth and its efficiency against antibiotics. The outcome focuses on developing a superior technique for monitoring biofilm maturation and the efficiency of antibiotics against antibiotic-resistant biofilms in medical settings. Thu, 01 Jan 2026 00:00:00 GMT http://irgu.unigoa.ac.in/drs/handle/unigoa/7895 2026-01-01T00:00:00Z