scholarly journals Preparation and Characterisation of complex Bis(pentafluorophenyl) antimony(V) anions of the type [(Rf)2SbCl3X]-

2013 ◽  
Vol 1 (3) ◽  
pp. 90-96 ◽  
Author(s):  
Ram Nath Prasad Yadav

A series of hiteherto unreported solid salts of hexa-coordinated anions of the general formula [(Rf)2SbCl3X]- , where Rf = C6F5 ; L = Cl and X = Cl, Br, I, N3, NCS and SeCN have been prepared in the presence of tetraorgano ammonium, phosphonium, arsonium and stibonium counter ions. The complexes have been formulated and characterised on the basis of elemental analysis, molar conductances, molecular weights and solid state IR, solution state 1H NMR and 19F NMR spectral data. The physico-chemical data are consistent with six-coordinate antimony complexes.DOI: http://dx.doi.org/10.3126/ijasbt.v1i3.8304 Int J Appl Sci Biotechnol, Vol. 1(3) 2013 : 90-96

2013 ◽  
Vol 1 (2) ◽  
pp. 42-48
Author(s):  
Ram Nath Prasad Yadav

Several hitherto unreported cationic complexes of the general formula [Ar2SbL][Y] and [ArSbL2][Y]2 [ Where, Ar  =  C6H5, L =  α-Picoline, Pyridine, Ph3AsO, hexamethyl phosphoramide (HMPA), thiourea (TU) and Y = ClO4− BF4− ] have been synthesized and characterized by solid state IR, 1H NMR, elemental analysis, conductance and molecular weight measurements. The physico-chemical data, cations [Ar2SbL]+1 and[ArSbL2]+2  are assigned a pyramidal structure.DOI: http://dx.doi.org/10.3126/ijasbt.v1i2.8204 Int J Appl Sci Biotechnol, Vol. 1(2): 42-49


2017 ◽  
Vol 68 (10) ◽  
pp. 2436-2439
Author(s):  
Stefania Felicia Barbuceanu ◽  
Laura Ileana Socea ◽  
Constantin Draghici ◽  
Elena Mihaela Pahontu ◽  
Theodora Venera Apostol ◽  
...  

In the work we presented the behavior of 5-(4-(4-X-phenylsulfonyl)phenyl)-4-(n-propyl)-2H-1,2,4-triazole-3(4H)-thiones (X= Cl or Br) with some alkylation agents. Thus, new S-alkylated 1,2,4-triazole derivatives were synthesized by reaction of the corresponding 1,2,4-triazole-3-thione derivatives with different �-halogenated compounds (ethyl bromide, ethyl chloroacetate or phenacyl bromide), in basic medium. The structures of synthesized compounds were elucidated by spectral data (1H-NMR, 13C-NMR, mass spectrometry) and elemental analysis.


2016 ◽  
Vol 4 (1) ◽  
pp. 10
Author(s):  
Amer A. Taqa

Some new metal(II) dichloride complexes with the ligands substituted nitrones of the general formula [ML2Cl2], where M= Co(II), Ni(II), Cu(II), Zn(II) and Cd(II), L=OCH=CHCH=C-CH=N(O)C6H4X (X=H,p-CH3,CH3O,CH3CO,F,Cl,and Br) have been prepared and characterized by elemental analysis, IR,1H,13C NMR and Vis/Uv spectroscopy. The IR spectral data showed that the nitrone ligands coordinated with the metal ion through the most active atom of the N-oxide to give square planner coordinate (Cu,Ni,) complexes and (Zn,Cd,Co) tetrahedral complexes. No correlation was observed between the N-O vibrations stretching high frequency ν (N-O) of the complexes and the Hammet (σ) constants.


2021 ◽  
Vol 11 (19) ◽  
pp. 9244
Author(s):  
Monika Kalinowska ◽  
Hanna Lewandowska ◽  
Marek Pruszyński ◽  
Grzegorz Świderski ◽  
Ewelina Gołębiewska ◽  
...  

In this study a cobalt(II) complex of quercetin was synthetized in the solid state with the general formula Co(C15H9O7)2∙2H2O. The FT-IR, elemental analysis, and UV/Vis methods were used to study the composition of the complex in a solid state and in a water solution. The anti-/pro-oxidant activity of quercetin and the Co(II) complex was studied by means of spectrophotometric DPPH (2,2-diphenyl-1-picrylhydrazyl), FRAP (ferric reducing antioxidant activity) and Trolox oxidation assays. The cytotoxicity of quercetin and Co(II)-quercetin complex in HaCat cell lines was then established.


2006 ◽  
Vol 60 (1) ◽  
Author(s):  
I. Malík ◽  
E. Sedlárová ◽  
J. Csöllei ◽  
F. Andriamainty ◽  
P. Kurfürst ◽  
...  

AbstractThe phenylcarbamic acid derivatives with N-phenylpiperazine moiety in the molecule have been prepared. The structure has been confirmed by elemental analysis, IR, 1H NMR, and mass spectral data. For the prepared set of the compounds the lipophilicity parameters have been determined. The experimentally obtained lipophilicity parameters have been correlated with theoretical entries obtained by different computer programs based on the neural network and fragmental methods.


2020 ◽  
Vol 49 (20) ◽  
pp. 6566-6571 ◽  
Author(s):  
Daniela Lalli ◽  
Stefano Marchesi ◽  
Fabio Carniato ◽  
Chiara Bisio ◽  
Lorenzo Tei ◽  
...  

A combination of solid-state NMR and 1H-NMR relaxometric investigations has been employed to characterize the structure and physico-chemical properties of a novel synthetic saponite intercalated with Gd(iii) and Y(iii) chelates.


2007 ◽  
Vol 72 (4) ◽  
pp. 321-329 ◽  
Author(s):  
Sohel Mostahar ◽  
Sayed Alam ◽  
Azizul Islam

Two new 2'-oxygenated flavones have been synthesized via chalcone precursors and the biocidal activity of these two flavones, along with the corresponding chalcones against microbes (bacteria and fungi) and brine shrimp nauplii were investigated. Both the flavones (compounds 6 and 7) and their corresponding chalcones (compounds 4 and 5) showed good activity against all the tested bacterial and fungal strains. The LC50 values of compounds 4-7 were found to be 2.31, 0.94, 1.39 and 0.58 ?gmL -1, respectively. The synthesized compounds were characterized using UV-Vis, IR, 1H-NMR and 13C-NMR spectral data, together with elemental analysis. .


1979 ◽  
Vol 57 (2) ◽  
pp. 180-187 ◽  
Author(s):  
Brian R. James ◽  
Devinder Mahajan

Rhodium(I)–bis(ditertiaryphosphine) complexes of the general formula [Formula: see text]n = 1–4, and (+)-diop (diop = 2,3-O-isopropylidene 2,3-dihydroxy-1,4-bis(diphenylphosphino)butane) have been prepared by treating [Rh(cyclooctene)2Cl]2 with the appropriate ditertiaryphosphine. The n = 1 and n = 4 and diop species are five-coordinate in the solid state and in non-polar solvents, while the n = 2 and 3 species contain ionic chloride. The cationic complexes [Formula: see text] were prepared from the [Formula: see text] species by adding AgX (X = SbF6, PF6, BF4). Reaction of the chloro complexes with borohydride has yielded the hydrides, [Formula: see text] for the n = 2 and 3 diphosphines, and for (+)-diop. 1H and 31P nmr, as well as visible spectral data, are presented: a solvent-dependent deshielding of ortho protons of the phenyl groups is observed in some of the complexes, and the ligand CH2 protons are coupled to the rhodium in the Rh(Ph2PCH2PPh2)2+ cation; the P atom in this bis(diphenylphosphino) ligand shows an usual high field shift on coordination to rhodium.Preliminary kinetic data for catalytic hydrogenation of methylenesuccinic acid show that the cationic and hydrido complexes are more active than the corresponding chloro complexes, and that activity generally increases with increasing chain length of the diphosphine.


2017 ◽  
Vol 68 (11) ◽  
pp. 2503-2508 ◽  
Author(s):  
Laura Ileana Socea ◽  
Stefania Felicia Barbuceanu ◽  
Bogdan Socea ◽  
Constantin Draghici ◽  
Theodora Venera Apostol ◽  
...  

Acylhydrazinecarbothioamides (2a,b) were synthesized by addition of 2-(5H-dibenzo[a,d][7]annulen-5-yl)acetohydrazide to different isothiocyanates. The new 1,2,4-triazol-3-thioles (3a,b) were synthesized by cyclization of new 2- acylhydrazinecarbothioamides (3a,b) in basic media. Alkylation of 1,2,4-triazole-3-thiols (3a-c) with ethyl bromide gave only S-substituted derivatives (4a-c). The structures of the synthesized compounds have been established on spectral data (IR, 1H-NMR and 13C-NMR spectroscopy) and elemental analysis. The cytotoxic effect of new compounds was evaluated using two alternative models on plant and invertebrate organisms.


2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
N. Shashidhar Reddy ◽  
B. S. Shankara ◽  
P. Murali Krishana ◽  
C. Basavaraj ◽  
B. Mahesh

Six new complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) with substituted benzofuran derivatives have been synthesized and characterized by elemental analysis, magnetic moments, conductance measurements, spectral characterization, and so forth. Elemental data coincide with the general formula MLC1n, where L = (E)-7-Methoxy-N1-(2,4,5-trimethoxy benzylidene) benzofuran-2-carbohydrazide (L1) or (E)-N1-(2,6-dichloro benzylidene)-7-methoxy benzofuran-2-carbohydrazide (L2), of the complexes. The ligands coordinate to the metal ions through the oxygen of the carbonyl group and the nitrogen of the hydrazine group. Electronic spectral data of the complexes suggests the probable geometry is octahedral in nature. All the complexes and ligands were screened for their antibacterial activity. Among them, Co, Ni, and Cu complexes of L2 showed good activity against all microbes.


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