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1.
Tin(IV) complexes 1(a and b) and 2(a and b) of valine derived peptide derivatives were synthesized and characterized on the basis of elemental analysis, IR, 1H, 13C, 119Sn NMR, ESI-MS spectra and molar conductance measurements. The C-Sn-C angle was estimated from I3C and 1H NMR data 1J(119Sn, I3C) = 623 Hz; solution 2J(119Sn, 1H) = 93.04 Hz to be 149.9°. In vitro binding studies of complexes 1 and 2 under physiological conditions at room temperature with CT-DNA were carried out employing UV-visible, fluorescence, circular dichroism and viscometric studies. The binding affinity of the complexes was quantified by calculating the Kb values and it follows the order 2a > 1a > 2b > 1b. To further examine the specific mode of binding, the interaction of complexes 2(a and b) were carried out with 5′GMP and 5′TMP by using absorption and NMR (1H, 31P) spectroscopy. The supercoiled pBR322 plasmid DNA cleavage activity of the complexes was ascertained by gel electrophoresis assay. The complexes cleave supercoiled pBR322 plasmid DNA efficiently into its nicked form at micromolar concentrations. 相似文献
2.
《Journal of Coordination Chemistry》2012,65(20):3401-3413
Cancer cases are alarmingly increasing worldwide, and newer chemotherapeutic agents are needed. Recent analogs of cisplatin (carboplatin, lobaplatin, nedaplatin and oxaliplatin) and their marketing as advanced chemotherapeutic drugs have furthered the interest in metal-based anti-cancer drugs. In the current study, two new polymeric organotin(IV) carboxylate complexes (1 and 2) have been synthesized and characterized. Spectroscopic studies showed that coordination took place via carboxylates. Furthermore, X-ray crystallographic study on 1 indicated that it possesses a monomeric structure and exists in polymeric formation due to additional Sn–N coordination, assigning seven coordinations to each metal ion. Both the complexes were tested against three cancerous (human colon cancer, HCT 116; breast cancer, MCF-7; and leukemia, K562) and one non-cancerous (3T3-L1) cell lines. Complex 1 showed exceptional cytotoxicity against cancerous cell lines (IC50 = 1.0 μM for HCT 116; 258.7 nM for MCF-7; and 46.7 nM K562) and remained comparatively non-toxic against normal cells (IC50 = 37.0?μM). This shows that both complexes have selective cytotoxicity against cancer cells. 相似文献
3.
Mothi Mohamed Ebrahim Helen Stoeckli-Evans 《Journal of organometallic chemistry》2007,692(11):2168-2174
Organotin(IV) complexes of the type [RSnCl3(cis-Ph2PCHCHPPh2)] [R = Me (1), nBu (2), Ph (3)] were prepared by the reaction of RSnCl3 with the rigid bisphosphine ligand, cis-1,2-bis(diphenylphosphino)ethylene in dichloromethane. The complexes have been characterized both in solution and the solid state. Low temperature 31P and 119Sn NMR studies indicate two different phosphorus environments. The crystal structures indicate a weak but chelating mode of coordination of the two phosphorus atoms to tin, leading to a distorted octahedral geometry. In solution the complexes 1-3 undergo a redistribution reaction to form [SnCl4(cis-Ph2PCHCHPPh2)] (4) as one of the products. In order to confirm the redistribution, complex 4 has been prepared separately and characterized both structurally and spectrally. 相似文献
4.
The [ReOCl2(hmpbta)(AsPh3)] · MeCN, [ReOBr2(hmpbta)(AsPh3)] · MeCN, [ReOCl2(hmpbta)(PPh3)] · MeCN, [ReOBr2(hmpbta)(PPh3)] · MeCN, and [ReBr2(hmpbta)(PPh3)] · MeCN complexes have been prepared in the reactions of [ReOX3(EPh3)2] (X = Cl, Br; E = P, As) with 2-(2’-hydoxy-5′-methylphenyl)benzotriazole in molar ratio 1:1. All the compounds were structurally and spectroscopically characterized. The electronic structure of [ReOCl2(hmpbta)(AsPh3)] has been calculated with the density functional theory (DFT) method. The TDDFT/PCM calculations have been employed to produce a hundred of singlet excited-states starting from the ground-state geometry optimized in the gas phase, and the UV–Vis spectrum of [ReOCl2(hmpbta)(AsPh3)] has been discussed on this basis. The paper reports also X-ray structure and DFT calculations for the disubstituted [ReOCl(hmpbta)2] chelate. 相似文献
5.
6.
Semanti Basu Sarmistha Halder Indrani Pal Saheli Samanta Parimal Karmakar Michael G.B. Drew Samaresh Bhattacharya 《Polyhedron》2008
Reaction of 1-(2′-pyridylazo)-2-naphthol (Hpan) with [Ru(dmso)4Cl2] (dmso = dimethylsulfoxide), [Ru(trpy)Cl3] (trpy = 2,2′,2″-terpyridine), [Ru(bpy)Cl3] (bpy = 2,2′-bipyridine) and [Ru(PPh3)3Cl2] in refluxing ethanol in the presence of a base (NEt3) affords, respectively, the [Ru(pan)2], [Ru(trpy)(pan)]+ (isolated as perchlorate salt), [Ru(bpy)(pan)Cl] and [Ru(PPh3)2(pan)Cl] complexes. Structures of these four complexes have been determined by X-ray crystallography. In each of these complexes, the pan ligand is coordinated to the metal center as a monoanionic tridentate N,N,O-donor. Reaction of the [Ru(bpy)(pan)Cl] complex with pyridine (py) and 4-picoline (pic) in the presence of silver ion has yielded the [Ru(bpy)(pan)(py)]+ and [Ru(bpy)(pan)(pic)]+ complexes (isolated as perchlorate salts), respectively. All the complexes are diamagnetic (low-spin d6, S = 0) and show characteristic 1H NMR signals and intense MLCT transitions in the visible region. Cyclic voltammetry on all the complexes shows a Ru(II)–Ru(III) oxidation on the positive side of SCE. Except in the [Ru(pan)2] complex, a second oxidative response has been observed in the other five complexes. Reductions of the coordinated ligands have also been observed on the negative side of SCE. The [Ru(trpy)(pan)]ClO4, [Ru(bpy)(pan)(py)]ClO4 and [Ru(bpy)(pan)(pic)]ClO4 complexes have been observed to bind to DNA, but they have not been able to cleave super-coiled DNA on UV irradiation. 相似文献
7.
Three new cocrystals based upon 2,2′-diamino-4,4′-bis(1,3-thiazole) (DABTZ) with 4,4′-bipyridine (4,4′-bipy), 1,2-bis(4-pyridyl)ethylene (bpe) and 1,3-bis(4-pyridyl)propane (bpp): [(DABTZ) (4,4′-bipy)], [(DABTZ) (bpe)] and [(DABTZ) (bpp)] have been synthesized and characterized by elemental analysis, IR-, 1H NMR-, 13C NMR spectroscopy and studied by thermal and X-ray crystallography. Self-assembly of these compounds in the solid state is likely caused by both hydrogen bonding, and π-π stacking. 相似文献
8.
Sartaj Tabassum Rais Ahmad Khan Subrata Sen Aarti S. Juvekar 《Journal of organometallic chemistry》2011,696(8):1600-2895
New glycosyl derived ligand and its complexes, with SnCl4·5H2O (1) and (CH3)2SnCl2(2) were synthesized and characterized by spectroscopic (IR, 1H, 13C, and 119Sn NMR, UV-vis, ESI-MS) and analytical methods. Interaction studies of 1 and 2 with CT DNA were studied by using various biophysical techniques, which showed high binding affinity of 2 with CT DNA. In vitro cytotoxicity of complexes 1 and 2 were evaluated against different human cancer cell lines of different histological origins by employing SRB Assay. The organotin(IV) complex 2 exhibited remarkable activity against DWD (oral cancer) cell lines with GI50 values <10 μg/ml. Complex 2 induced apoptosis of DWD cell line at a very low concentration of 1-4 μg/mL. 相似文献
9.
《Journal of Coordination Chemistry》2012,65(14):2369-2387
New organotin(IV) carboxylates, R2SnL2 (R=n-Bu: 1), R2Sn(Cl)L (R=n-Bu: 2), and R3SnL (R=Me: 3; n-Bu: 4; Ph: 5) have been synthesized by stirring 5-chloro-2-hydroxybenzoic acid HL with KOH and R2SnCl2 (R=n-Bu)/R3SnCl (R=Me, n-Bu, Ph) in methanol at room temperature. The complexes along with ligand have been characterized by FTIR, (1H, 13C) NMR, EI-MS, and single-crystal XRD crystallography. FTIR data indicated bidentate coordination of carboxylate. NMR data suggested six- or five-coordinate geometry of organotin(IV) carboxylates. Single-crystal XRD of 1 demonstrated skew-trapezoidal geometry around the tin center, with the basal plane occupied by four oxygens and the two butyl groups lying in distorted axial position. Complexes 1, 2, and 5 exhibited interaction with SS-DNA (salmon sperm) and suggests intercalating mode of binding. The complexes displayed significant antimicrobial activities against bacterial and fungal strains as compared to free ligand. The hemolytic activity of the complexes was lower compared to Triton-X 100 (positive control, 100% lysis) and higher than phosphate-buffered saline (negative control, 0% lysis). Complex 4 was the most potent inhibitor of bacterial/fungal growth. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(16):2953-2967
AbstractThe N(4)-methylthiosemicarbazone derivatives H2DDMT (1) and H2DMMT (2) have been prepared from the reaction of 4-methylthiosemicarbazide with 2,3-dihydroxybenzaldehyde and 2-hydroxy-5-methylbenzaldehyde, respectively. Six new organotin(IV) complexes, [MeSnCl(DDMT)] (3), [BuSnCl(DDMT)] (4), [PhSnCl(DDMT)] (5), [MeSnCl(DMMT)] (6), [BuSnCl(DMMT)] (7), and [PhSnCl(DMMT)] (8) have been synthesized by direct reaction of corresponding organotin(IV) chloride(s) with these ligands. The ligands and their compounds have been characterized by elemental analysis, molar conductivity, UV–Vis, FT-IR, and NMR (1H, 13C, and 119Sn) spectroscopy. The molecular structures of 1 and 2 were determined by X-ray crystallography. Spectroscopic data suggested that the ligands were coordinated to tin(IV) as dinegative tridentate via phenoxide-O, azomethine-N, and thiolate-S atoms. The crystal structures revealed that the ligands exist in thione form in the solid state. In vitro cytotoxicity assays were carried out for all the compounds against MCF-7 cancer cell line. The results have shown that different organotin(IV) groups showed characteristic differences in their biological activity. 相似文献
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12.
《Journal of Coordination Chemistry》2012,65(4):572-590
Cyclohexylcarbamodithioic acid has been synthesized by the reaction of cyclohexylamine with carbon disulfide at room temperature. Its complexes have been synthesized by the reaction of cyclohexylcarbamodithioic acid with organotin(IV) chlorides in 1?:?1/1?:?2 molar ratio. The ligand and complexes have been characterized by elemental analysis, infrared (IR), and multinuclear (1H, 13C, and 119Sn) NMR spectroscopy. Elemental data show good agreement between calculated and found values of carbon, hydrogen, nitrogen, and sulfur. IR data show that the ligand is bidentate and complexes exhibit a five-coordinate geometry in the solid state, which is also confirmed by semi-empirical studies. NMR data show that the complexes exhibit tetrahedral geometry in solution state. The ligand and its complexes were screened for their in vitro mutagenic, antimicrobial, MIC, antioxidant activities, and cytotoxicity. Biological screening data demonstrate that complexes show significant activity against various bacterial and fungal strains and are good antioxidants. The cytotoxicity data show positive lethality for complexes as compared to ligand and can play a very significant role in drug development. 相似文献
13.
A brief account is given of the synthesis and stereochemistry and the antibacterial, antifungal, nematicidal and insecticidal behaviour of organosilicon(IV) and organotin(IV) complexes of a biologically potent ligand, 2‐acetylfuransulfaguanidine. The unimolar and bimolar substitution products have been characterized by elemental analyses, conductance measurements, molecular weight determinations, and spectral studies, viz. IR, 1H NMR, 13C NMR, UV, 29Si NMR and 119Sn NMR spectra. The data support the binding of the nitrogen atom to the metal atom in R3M(N∩N), [R2M(N∩N)2 and R2M(N∩N)Cl [(R = Me/Ph and M = Si(IV) and Sn(IV)] types of complex. Based on these studies, with coordination number five and six a trigonal bipyramidal and an octahedral geometry have been proposed for the resulting derivatives. The free ligand (N∩NH) and its respective metal complexes were tested in vitro against a number of microorganisms to assess their antimicrobial properties. The results are indeed positive. In addition to these studies, the complexes also show good nematicidal and insecticidal properties. The results of these findings have been discussed in detail. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
14.
Reactions of copper(I) halides with racemic 2,2′-bis(diphenylphosphano)-1,1′-binaphthyl (rac-binap) in 1:1 molar ratio afforded mononuclear complexes of the type [CuX(rac-binap)] (X = Cl, Br, I) which, on further treatment with 1 equiv. of pyridine-2-thione (py2SH), pyrimidine-2-thione (pymtH) or 4,6-dimethyl-pyrimidine-2-thione (dmpymtH) gave rise to the formation of mixed-ligand complexes of the formula [CuX(rac-binap)(thione)]. The molecular structures of [CuBr(rac-binap)(py2SH)] · 2CH2Cl2, [CuBr(rac-binap)(py2SH)] · CH2Cl2 and [CuBr(rac-binap)(dmpymtH)] · CH2Cl2 have been established by single-crystal X-ray diffraction. Each of the complexes features a distorted tetrahedral copper(I) center with the phosphane acting in a chelating fashion. The complexes are strongly luminescent in the solid state at ambient temperature. Unusually, the [CuBr(rac-binap)(py2SH)] · 2CH2Cl2 molecules crystallise in a chiral space group with independent S- and R-enantiomers in the asymmetric unit. 相似文献
15.
《Journal of Coordination Chemistry》2012,65(24):4423-4443
Trinuclear Ag(I) (1) and dinuclear and mononuclear Zn(II) isonicotinate (2 and 3) complexes were prepared and characterized by X-ray crystallography, elemental analysis, IR spectroscopy, and thermal analysis. Single-crystal analysis of the Ag(I) complex reveals two different monodentate carboxylate coordination modes, protonated and deprotonated, respectively. IR spectra showed correlations between isonicotinate coordination modes and Δ(νas???νs)IR values. In addition, the hydrogen bonds significantly influence a position of carboxylate absorption bands. Moreover, IC50 and MIC data for bacteria, yeasts, and filamentous fungi were determined and the binding of Ag(I) and Zn(II) complexes to calf thymus DNA was investigated using electronic absorption, fluorescence, and CD measurements. Biological tests showed that the Ag(I) complex is more active than commercially used Ag(I) sulfadiazine against Escherichia coli. The fluorescence spectral results indicate that the complexes can bind to DNA through an intercalative mode. The Stern–Volmer quenching constants for investigated complexes obtained from the linear quenching plot are in the range of 1.67 × 104–3.42 × 104 M?1. 相似文献
16.
Mairad E. Kelly Santiago Gmez-Ruiz Jürgen Schmidt Christoph Wagner Harry Schmidt 《Polyhedron》2008,27(14):3091-3096
Reactions of the flexible α,ω-bis(pyrazol-1-yl) compounds 1,2-bis(pyrazol-1-yl)ethane (L1), 1,8-bis(pyrazol-1-yl)-n-octane (L2), bis[2-(pyrazol-1-yl)ethyl]ether (L3) and bis[2-(pyrazol-1-yl)ethyl]thioether (L4) with precursor organometallic platinum complexes ([(PtBr2Me2)n], [(PtIMe3)4] and [(PtMe2(cod)]/I2) are described herein. The spectroscopic characterization of the platinum(IV) products of these reactions [PtBr2Me2{pz(CH2)mpz}], m = 2 (1) or 8 (2), [PtI2Me2{pz(CH2)2pz}] (3), [PtMe3(pzCH2CH2OCH2CH2pz)][BF4] (4) and [PtMe3(pzCH2CH2SCH2CH2pz)][CF3SO3] (5), where ‘pz’ is pyrazol-1-yl, is discussed. Furthermore, solid state structures of 1, a complex with a seven-membered chelate ring, and 4, a complex bearing the neutral κ2N,N′,κO ligand bis[2-(pyrazol-1-yl)ethyl]ether (L3) are reported. 相似文献
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18.
Shin-ichi Naya 《Tetrahedron》2008,64(14):3225-3231
As novel methodology for synthesizing the furan ring, a photoinduced oxidative cyclization of 5-(4′,9′-methanocycloundeca-2′,4′,6′,8′,10′-pentaenylidene)pyrimidine-2,4,6(1,3,5H)-triones (7a-c) and related compounds 9a-c was accomplished to give 5,10-methanocycloundeca[4,5]furo[2,3-d]pyrimidine-2,4(1,3H)-dionylium tetrafluoroborates (8a-c+·BF4−) and related compounds 2a-c+·BF4−, respectively. In the photoinduced oxidative cyclization, the molecular oxygen in air is used as oxidant and the reaction proceeds under mild conditions to give desired products without byproducts, and thus, it is interesting from the viewpoint of the green chemistry. On the reactions of the mono-substituted derivatives 7d,e and 9e,f, the selectivity of the photoinduced cyclizations were reversed as compared with those of the DDQ-promoted oxidative cyclizations. By the NMR monitoring of the reactions of 7a and deuterated compound 7a-D2 under degassed conditions, the details of the reaction pathway were clarified and rationalized on the basis of the MO calculation by the 6-31G∗ basis set of the MP2 levels as well. 相似文献
19.
Vasily V. Bashilov Pavel V. Petrovskii Mara Sada Gianni Zotti 《Journal of organometallic chemistry》2005,690(19):4330-4336
η2-Fullerene (C60 and C70) palladium optically active complexes with the axially chiral enantiomeric ligand of bithienyl series, [(−)tetraMe-BITIOP], have been synthesized and investigated by 31P-{1H} NMR, electronic spectroscopy, CD spectroscopy, cyclic voltammetry and by single crystal X-ray diffraction. 相似文献
20.
Daniel Botelho da Silva Abdelouahid Samadi María do Carmo Carreiras 《Tetrahedron letters》2010,51(48):6278-6281
An unexpected, but simple method for the efficient synthesis of new 2.2′-azopyridine dyes, such as (E)-diethyl 6,6′-(diazene-1,2-diyl)bis(5-cyano-2-methyl-4-phenylnicotinates) (2, 4, 6, 8, 10, and 12), based on the treatment of ethyl 6-amino-5-cyano-2-methyl-4-arylnicotinates (1, 3, 5, 7, 9, and 11) with NBS/benzoyl peroxide, is described. The X-ray diffraction analysis and the UV-vis absorption spectra of dye 2 are reported and discussed. 相似文献