Papers by Rajkumar Mandal
ChemistrySelect, 2019
A series of six hetero-bimetallic complexes having umbrella shape topology and general formula (L... more A series of six hetero-bimetallic complexes having umbrella shape topology and general formula (L) 2 CuLn(NO 3)(Ph 3 PO) have been synthesized by reacting a methanolic solution of diprotic ligand (H 2 L) [(E)-2-(((2-hydroxyphenyl)imino)methyl)-6methoxyphenol] and co-ligand Ph 3 P=O with CuCl 2 .2H 2 O and Ln (NO 3) 3 ⋅6H 2 O (Ln = Gd(1), Tb(2),Dy(3), Ho(4), Er(5) and Y(6)) in the presence of triethylamine base. The iso-structural complexes (1-6) have been characterized by Single crystal XRD measurement. Elemental analysis, EPR, IR and UV/Vis spectra have been recorded to further characterise these complexes. The direct current (dc) and alternating current (ac) magnetic susceptibility measurements has been carried out to study magnetic properties of the complexes. Thermogravimetric analysis (TGA) has also been done to assess thermal stability of the complexes.
ChemistrySelect, 2019
Two novel 3d (Ni)/4 f (Dy and Y) metal ions and polydentate organic ligands (H 2 L1 and H 2 L2) b... more Two novel 3d (Ni)/4 f (Dy and Y) metal ions and polydentate organic ligands (H 2 L1 and H 2 L2) based tetranuclear coordination complexes, [(L1) 4 Ni II 2 Dy III 2 (DMF) 2 (NO 3) 2 ]⋅DMF (1) and [(L2) 4 Ni II 2 Y III 2 (DMF) 2 (NO 3) 2 ]⋅DMF⋅H 2 O (2), have been synthesized and characterized using IR, elemental analysis and single crystal X-ray diffraction studies. The application of these complexes as CÀ C bond coupling homogeneous catalysts has been logically shown. The complex 1 acts as an excellent catalyst (with a very low catalyst loading of 0.17 mol%) for the syntheses of a wide range of bis(indolyl)methane derivatives in good yields using various indoles and aromatic/hetero aromatic aldehydes under optimized reaction conditions. A plausible reaction mechanism has been proposed showing the coordinative binding of the aromatic aldehyde at Ni II centre along with the associative πstacking interaction between the ligand (H 2 L1) and the phenyl ring of the aromatic aldehyde and/or indole leading to the formation of the desired bis(indolyl)methanes under the metal assisted CÀ C bond forming reaction with subsequent elimination of water molecule in polar protic solvent.
GSC Advanced Engineering and Technology, 2022
Marine ecosystems cover approximately 71% of the Earth's surface and contain approximately 97... more Marine ecosystems cover approximately 71% of the Earth's surface and contain approximately 97% of the planet's water. Dissolve oxygen, which is a vital parameter in Ocean’s primary production, is having a sensitive integrating property reflecting physical and biogeochemical changes in the marine environment. The dissolve oxygen in the sea water is affected by parameters such as high organic load, high temperature and high salinity level. The higher the oil pollution load, less will be the dissolved oxygen concentration level. The solubility of oxygen decrease as temperature increases. Dissolved oxygen decreases exponentially as salt levels increase. Thus temperature and salinity have a great impact upon biological productivity and are important to understand the dynamics of water column. Nearly all living organisms need oxygen in order to carry out their biological processes. By analyzing the variation of dissolve oxygen, temperature and salinity, environmental status of tha...
Mathematical Statistician and Engineering Applications
A number of more recent discoveries in microbiology have made reliable identification of nano-bio... more A number of more recent discoveries in microbiology have made reliable identification of nano-biomolecules and extensive analyses of them necessary. A variety of proteins, including DNA, biotin-streptavidin, amino acids, as well as many types of bacteria and viruses, must be found and analyzed in order to fully comprehend any odd behavior occurring inside of live cells. Rapid testing and detection are essential steps in preventing undiscovered biohazards from eradicating the human race and other terrestrial living things. Since many decades ago, developing an accurate, affordable biosensor has been a struggle for scientists [1]. When compared to pricey laboratory-based sensors and detection methods, FET-based lab-on-chip nano biosensors appear to be a promising substitute. It is significantly more dependable than conventional bulk sensors because of its size, affordability, low power consumption, resilience, faster response time, and better sensitivity [1]. Due to their precision, a...
March April ECG RECTIFICATION THROUGH MULTI-STAGE ADAPTIVE FILTERING Rajesh Dey 1 , Peeusa Mitra ... more March April ECG RECTIFICATION THROUGH MULTI-STAGE ADAPTIVE FILTERING Rajesh Dey 1 , Peeusa Mitra 2 Rajkumar Mandal 1, Syed Samser Ali 3 , Achintya Das Department of Electronics and Communication Engineering SDET-Brainware Group of Institutions, Barasat, Kolkata, India 2 Department of Electronics and Communication Engineering Kalyani Government College of Engineering, Kolkata, India 3 Department of Electronics and Communication ngineering , Gargi Memorial Institute of chnology,Baruipur,Kolkata,india Correspondance: [email protected] ABSTRACT: –Death due to Cardiac Disease across the world is increasing day by day . Electrocardiogram (ECG) is one of the effective ways of detecting heart disease. The ECG (electrocardiogram) is a framework that gives patient's basic heart movement. The Adaptive Electro gram Filter will be intended to diminishing noise brought about by outer frameworks and body antiques. This paper intends to decrease the commotion obstruction in the ECG signals an...
This book has been written to have a knowledge regarding Microcontroller based GSM/GPRS projects.... more This book has been written to have a knowledge regarding Microcontroller based GSM/GPRS projects. A Microcontroller is a single-chip computer. Before the invention of the Microcontrollers most intelligent systems were premeditated using microprocessors. A microprocessor is the processing component of a computer, comprising of an Arithmetic and Logic Unit (ALU) and the Control Unit (CU). A microprocessor on its own has no use and it has to be sustained by a large number of peripheral chips, such as memory, input-output device, timer, counter, interrupt logic and so on. Currently there are many Microcontroller chips manufactured by numerous companies. This book demonstrates the basic principles of Microcontrollers and shows how they can be used in GSM/GPRS based communications projects.
Uploads
Papers by Rajkumar Mandal