In the present work, we have reported the synthesis of benzimidazoles functionalized crown ether derivatives of 4-formyl benzo-15-crown-5/4,4′-diformyl dibenzo-15-crown-5 and substituted diamine ...pyridine using sulfamic acid as a catalyst in DMSO. These molecules are used for the colorimetric determination of Au
3+
selectively among other metal cations such as Fe
2+
, Co
2+
, Ni
2+
, Cu
2+
, Zn
2+
, Cd
2+
, Pb
2+
, Hg
2+
, Au
3+
and Ag
+
ions
.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
A practical, two‐step synthesis of crown ether functionalized pyrimidines has been developed. The reaction conditions have been optimized, and the protocol is generalized for series of substrates. ...These newly synthesized compounds exhibited antimicrobial activity against bacterial strains Staphylcoccus aureus (Gram‐positive) and Escherichia coli (Gram‐negative). These compounds were also found to be potent antifungal agents Aspergillus niger and Candida albicans strains, respectively.
An ecofriendly and economical method of Knoevenagel condensation of aromatic aldehydes with malononitrile catalyzed by lemon juice, a natural catalyst, in the absence of any solvent is described.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
The present investigation entitled “Correlation and Path Analysis and Studies in Ajwain (Trachyspermum ammi L. Sprague)” was carried out with fifteen genotypes including three checks. The experiment ...was conducted in Randomized Block Design with three replication during rabi 2020-2021 at Chilli & Vegetable Research Unit, Dr. PDKV, Akola. The observations were recorded on five randomly selected plants for nine characters viz., days to first flowering, days to 50 per cent flowering, days to maturity, plant height at maturity, number of primary branches per plant, number of umbels per plant, number of umbellates per umbel, test weight and seed yield per plant. The data so obtained was subjected to analysis of variance and selection indices study. In the present study, the mean performance of genotypes revealed a wide range of variability for all the characters. Significant highest mean values were recorded for seed yield per plant in genotype AKAJ-18-13-21 (7.62 g) followed by AKAJ-18-10-21 (7.16 g) and AA-2 (7.12 g). Genotypes viz., AKAJ-18-13-21 and AKAJ-18-05-21 were found to be early maturing among experimental material. The selection indices studies indicated that the individual trait index, number of umbels per plant had the highest relative efficiency (101.507 per cent) indicated the importance of this trait as yield attribute. In this present investigation, selection index based on three characters (number of umbels per plant + number of umbellates per umbel + test weight) showing genetic gain (2.444) and relative efficiency (104.504 per cent) is more desirable and practically possible to use than those based on four or more characters.
Dibenzothiazolyldibenzo‐18‐crown‐6‐ether was designed and synthesized by formylation of dibenzo‐18‐crown‐6‐ether followed by condensation with 2‐aminothiophenol. A simple and rapid UV‐Visible ...spectrophotometric method is developed for detection of trace of palladium ions. Furthermore it was assessed for antimicrobial activity against bacterial strains Staphylococcus aureus (Gram+ve), Escherichia coli (Gram−ve) as well as fungal strains Aspergillus niger and Candida albicans respectively.
Ternary TiO
2
/SnO
2
/WO
3
hybrid nanostructures were prepared by using ultra-sonic assisted sol–gel wet impregnation method, and investigated for NH
3
gas sensing applications. The physicochemical ...properties of the prepared samples were investigated using X-ray diffraction spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, ultra-violet-visible spectroscopy, and X-ray photoelectron spectroscopy. The results showed threefold increase in NH
3
gas sensing performance with high selectivity, high response–recovery time at operating temperature 200 °C for ternary TSW-1 NC as compared to its bare, binary and other ternary counterparts. Due to mesoporous morphology of ternary TSW-1 NC and better interconnectivity between metal oxide NPs; NH
3
molecule adsorbed efficiently on the surface as well as in interior part of lattice matrix, which resulted into a good sensing response.
The frequency dependent dielectric relaxation spectra for binary mixture of dimethylacetamide with formamide and dimethylformamide at 11 different concentrations at 30°C over frequency range 10 MHz ...to 20 GHz is studied. The mixture exhibit a principle dispersion of the Davidson-Cole relaxation type. Dielectric constant (ϵ
0
), relaxation time (τ), excess dielectric constant (ϵ
E
), excess inverse relaxation time (1/τ)
E
and Kirkwood correlation factor (g) have been determined and discussed in terms of the effect of NH
2
and -CH
3
side group on molecular dynamics and intermolecular hydrogen bonds. Conformational analysis of the formation of hydrogen bond is supported by the FTIR study.
Dielectric relaxation study on dimethylacetamide with ethanolamine and dimethylaminoethanol binary mixtures has been carried out at eleven concentrations over the frequency range of 10 MHz to 20 GHz ...at 30°C using TDR technique. The least squares fit method has been used to obtain the static dielectric constant (ϵ
0
) and relaxation time (τ). By using these dielectric parameters, the excess permittivity (ϵ
E
), excess inverse relaxation time (1/τ)
E
and Kirkwood correlation factor (g
eff
) are also obtained for investigating the intermolecular interaction. Conformational analysis of the intermolecular interaction between DMA-ETA and DMA-DMAE systems is supported by the FTIR spectra.
