Photoluminescence, photoredox properties and crystal structures of rhenium(v)-benzylidyne complex with phosphine ligands.

Several rhenium(v)-benzylidyne complexes [Re(CR)(pdpp)2Cl]+[R=C6H2Me3-2,4,6,pdpp= o-phenylenebis(diphenylphosphine)], [Re(CR)L2(CO)(H2O)Cl]+ [L=PPh3, P(C6H4OMe-p)3 or PMe2Ph] and trans-[Re(CR)(dppe)(CO)2Cl]+ [dppe= 1,2-bis(diphenylphosphino)ethane] have been prepared. The structures of trans-Re(CR)(pdpp)2Cl]ClO4.CHCl3.0.25MeOH and [Re(CR)(PPh3)2 (CO)(H2O)Cl]ClO4. 1.5MeOH have been determined by X-ray analyses. The Re≡C distances are 1.802(5) and 1.784(8) Å respectively. In acetonitrile and dichloromethane the complexes show intense absorption bands at 318-330 nm and weak ones at 405-450 nm, the latter being tentatively assigned to dxy → dn* (dxz,dyz) transitions. Photoexcitation in the solution, solid or glassy state gives intense orange to red emissions, and the emitting states are tentatively assigned to 3[(dxy)1](dπ*)1]. The variation in non-radiative decay rate constants for the emissions of the rhenium(v)-benzylidyne complexes are consistent with a predication from the energy-gap law. The excited states are better oxidants and reductants than the grounds states. The values of E°(Rev*-ReIV ) and E° (ReVI-ReV*) in acetonitrile have been determined using spectroscopic and electrochemical data as well as by Stern-Volmer  quenching experiments

Photochemical and electrochemical properties of tetranuclear Ru (II) complexes

The luminescent and redox active multinuclear Ru (II) Complex containing both electron poor (2,3-bis (2-pyridyl) pyrazine, 2,3-dpp) and electron rich (3,5-bis (pyridyn-2yl)-1,2,4-¬triazole, Hppt) polypyridine bridging ligands has been synthesized. The novel complex is [ (phen)2 Ru (µ-bpt)Ru{(µ-2,3-dpp) Ru(Phen)2}2]7+ (1:Phen-=1,10-Phenanthroline) Its absorption spectrum, luminescence properties, and redox behavior have been studied and compared with the properties of parent complexes [Ru {(µ-2,3-dpp) Ru (Phen)2}3]8+ (2) and [(Phen)2 Ru (µ-bpt) Ru (Phen)2]3+ (3). The absorption spectrum of 1 is dominated by ligand centered bands in the U.V. region and by metal to ligand CT bands in the visible region. Excited states and oxidation and reduction processes are localized in specific sites of the multicomponent structure. However, perturbations of each component on the redox and excited state properties, as well as electronic interactions between the chromospheres can be observed. Intercomponent energy transfer from the upper lying (µ-bpt) (Phen) Ru ï§Phen CT ¬excited state of the Ru (Phen)2 (µ-bpt)+ component to the lower lying (Phen)2 RUï§ µ 2,3-dpp CT excited - state of the Ru (Phen)2 (µ-2,3-dpp)2+ subunit(s) is efficient in fluid solution at room . And the process is not observed in a rigid matrix at 77 K. A two step energy transfer mechanism is proposed to explain the photophysical properties of the new complex

Electron transfer quenching studies of luminescent complex’s of Ru (iii) with mixed ligands

In the present paper the reaction of Ru (III) perchlorates with some polytertiary phosphines and arsines has been investigated. The study of quenching of excited states of Ru (LL’-)33+  complexes and subsequent reaction occuring with potential reductant - amines, aromatic ether, nitro compounds, p-hydroquinone and water have been observed. Both laser flash and convensional spectroscopic techniques have been used to monitor the quencher products. The photo reduction of complex (I) with triethylamine can be shown to consists of two component, a primary photoprocess and a subsequent dark reaction while for complex (II) only the first process is observed. The reduced complex Ru (LL’)+23 produced in the reaction are relatively stable and dry deacrated solution but can be observed rapidly with both oxygen and water. The reaction of reduced (I) with water is a relatively produce Ru (LL’) +3H+2 which yields hydrogen and to starting. Complex (I) with colloidal platinum excited states of (I) are also quenched by aromatic ether and hydroquionones in process giving transients having spectra similar to that the reduced (I). The reaction between excited (I) with water (K = 1x 107M-1 S-1) gives a short lifed transient (ïŠ= 245ns) more lightly an adduct or ligand protonated species more lightly and adduct or ligand protonated species

Marcus inverted region in the photoinduced electron transfer reactions of ruthenium(ii)-polypyridine complexes with phenolate ions.

Ruthenium (II)- polypyridy1 complexes of similar size but with variable reduction potential undergo efficient photoinduced electron- transfer reactions with phenolate ions in aqueous medium. All these reactions are exergonic and are in accordance with the Marcus theory of electron transfer. At high negative G° Marcus inverted region is observed in this bimolecular photoinduced charge separation reaction

Association of serum beta-hCG and urine albumin-creatinine ratio with hypertensive disorders during pregnancy

Background: Preeclampsia with or without severe symptoms, chronic hypertension with or without superimposed pre-eclampsia/eclampsia, gestational hypertension, HELLP syndrome, or eclampsia all pose a significant risk of morbidity for both the mother and the unborn child. The aim of this study was to investigate if the albumin-to-creatinine ratio in urine spots and the serum beta-hCG level correlate with the hypertensive illness of pregnancy.” Method: “The current inquiry was conducted during the months of October 2020 and August 2022 at the obstetrics and gynaecology department of Subharti medical college in Meerut, Uttar Pradesh. The study was not open to women who were more than 20 weeks pregnant, had gestational diabetes mellitus, had more than one pregnancy, had chronic hypertension, chronic renal disease, chronic liver disease, cardiac disease, systemic lupus erythematosus, or haematological illnesses. We measured the levels of serum beta hCG and the urine albumin-creatinine ratio, and we compared them between the groups.” Results:  After ensuring that each participant had given their informed permission, the trial comprised a total of 200 patients. In the hypertensive group of the participants in the study, 31% were between the ages of 21 and 35, and 29% were less than 20 years old. With increased beta hCG and UACR, there was a higher incidence of hypertensive retinopathy, acute renal failure, DIC, and PPH among the patients, as well as the poorest fetal outcomes. (p<0.05) Conclusions: The presence of a substantial relationship between hypertensive diseases and raised levels of beta-hCG during pregnancy, as well as a greater ratio of urine albumin to creatinine.  There is a considerable increase in the incidence of fetal growth retardation, preterm, and mortality occurring within the uterus among mothers who have higher levels of beta-hCG and urine ACR

A case report on serous cyst fibroadenoma of ovary

A 16-year-old unmarried female patient presented to the Subharti hospital with a lump in her abdomen that had been there for one year. For the previous two months, there had been abdominal pain. Constipation, intermittent fever, and vomiting were all present. A mass of around 25×25 cm (approximately) was found on per-abdominal examination, which was firm in consistency, non-tender, afebrile to touch with smooth borders, and restricted mobility. On the basis of the above mentioned examination and investigation, a diagnosis of ovarian cyst with typhoid immunoglobulin G (IgG) and immunoglobulin M (IgM) positive, dengue IgG with hepatitis B surface antigen (HbsAg) positive was made

Presentation of acute pulmonary edema in severe pre-eclamptic pregnant women: a case report

Pulmonary edema refers to an excessive accumulation of fluid in the pulmonary interstitial and alveolar spaces. It may occur in low risk pregnancies but one very important predisposing factor is association with pre-eclampsia. Acute pulmonary edema during pregnancy is very rare and occurs in 0.08% pregnancies. About 3% of severe pre-eclamptic patients develop acute pulmonary edema. Several risk factors have been identified: preeclampsia or eclampsia, use of tocolytic therapy, severe infection, cardiac disease, iatrogenic fluid overload, and multiple gestations. This case examines one such presentation and reviews some of the diagnostic possibilities

Molecular docking of potential Indian medicinal plant compounds against dengue viral proteins

Dengue fever is one of the major health issue caused by Dengue virus. The present work focuses on virtual screening of compounds from the selected medicinal plants, Azadirachta indica, Andrographis paniculata, Tinospora cordifolia and Carica papaya for their anti-viral activity against dengue virus. The envelop protein and methyl transferase enzyme of dengue virus has been selected for the study. Computer aided docking of plant compounds with selected viral proteins known for its pathogenicity in humans were performed using AutoDock software after checking their drug likeness property based on Lipinski’s rule of five. Most of the selected compounds docked well with the viral protein in terms of their binding energy and ligand efficiency with effective drug likeness property as compared to the reference synthetic drug.  Nimbocinol and Meliacinanhydride of Azadirachta indica were found to be the top most compounds against selected dengue viral protein displaying highest binding affinity. Andrographolide of A. paniculata and Tinosporide and Berberine of T. cordifolia also showed promising results against viral proteins. Since these naturally derived compounds have several advantages over synthetic drugs, these compounds can be used as an anti-viral drug for the treatment of dengue fever after checking their efficacy and safety by in-vitro and in-vivo experiments

A Comparative Study of Oversampling Techniques on Binary Classification for Detecting Duplicate Advertisement

The online marketplace has become a great platform for conducting business. Not only does it allow the users to find and buy desirable items easily, but also stages an area where the user can upload their refurbished products in search of a potential buyer. Due to ever increasing competition within the market, competitive sellers go to great lengths to ensure that their products are noticed. This results in sellers posting the same advertisement several times, using near-duplicate titles or using slightly altered descriptions. This study proposes to build a dichotomous classifier that would spot such duplicate commercial advertisements that feature the same product. A Russian dataset of 3 million records was translated into English, for the better understanding of the results. The dataset was imbalanced with data samples for duplicate class less than the non-duplicate class. This study compares the six oversampling techniques, Random oversampling, SMOTE, SMOTE-Borderline 1, SMOTE-Borderline 2, SVM SMOTE and ADA- SYN, used to achieve class balance in the dataset. Four classification models, Gradient Boosting Tree, Logistic Regression, Naive Bayes and SVM, are built, on top of the oversampling techniques, to identify the duplicate advertisements. This study finds that the performance of classifiers improves with an increase in the sample size of the training data. The best performing model was SVM when paired with Borderline-SMOTE 2, with an F1 score of 0.9151 The proposed model will prevent the buyers from sifting through the dozens of deceptively identical advertisements, thereby expediting the search process. With more accurate duplicate ad detection, the model will enable the buyers to easily find a desirable product

Atmanirbhar Bharat: Fixing flawed design important

Handholding domestic industries to develop domestic capacities should be a part of India’s economic strategy, not the entirety of it.Non-PRIFPRI5SA