14494-89-4Relevant academic research and scientific papers
Direct observation of fine structure transitions in a paramagnetic nickel(II) complex using far-infrared magnetic spectroscopy: A new method for studying high-spin transition metal complexes
Vongtragool, Suriyakan,Gorshunov, Boris,Dressel, Martin,Krzystek,Eichhorn, David M.,Telser, Joshua
, p. 1788 - 1790 (2003)
Novel far-infrared (FIR) absorption spectroscopy in conjunction with multiple, fixed external magnetic fields (FIR magnetic spectroscopy, FIRMS) has been used to investigate pseudotetrahedral complexes with the formula M(PPh3)2Cl2 (M = Ni, Zn; Ph = C6H5). Crystal structures have been reported for the Ni complex; we report the structure of the Zn complex. Transmission spectra at 5 K of Ni-(PPh3)2Cl2(S = 1) at zero magnetic field exhibit absorption bands at 11.41, 15.28, and 23.0 cm-1. The two lower frequency bands show great sensitivity to external magnetic field, and their field dependence is as expected for electron spin transitions allowing precise determination of the following parameters: |D| = 13.35(1) cm-1, |E| = 1.93(1) cm-1, gx,y = 2.20(1), gz = 2.00(1). Corresponding spectra of Zn(PPh3)2Cl2 (S = O) exhibit bands only at >20 cm-1, which show no field dependence. FIRMS is a promising technique for direct investigation of the electronic structure of high-spin transition metal complexes.
Catalytic one-pot three-component synthesis of 3,3′-disubstituted oxindoles and spirooxindole pyrans by mixed ligand transition metal complexes
Hegade, Sujit,Gaikwad, Gautam,Jadhav, Yuvraj,Pore, Avinash,Mulik, Abhijeet
, p. 95 - 103 (2021/11/22)
Abstract: New three-component reaction was developed via one-pot strategy for the synthesis of functionalized 3,3′-disubstituted oxindoles and spirooxindole through the reaction among isatin, malononitrile, and acetone/indole/nitromethane/acetylacetone/di
Synthesis and Reactivity of Selones and Dihaloselones: Complexation of Selones with d8- and d10-Metal Ions
Yadav, Sangeeta,Singh, Harkesh B.,Butcher, Ray J.
, p. 2968 - 2979 (2017/06/28)
The reactivities of the monodentate selone LSe (L = 1,3-dibutylbenzimidazol-2-ylidene; 10a), the bidentate pyridine-functionalized selone L′Se (L′ = 1-pyridyl-3-butylimidazol-2-ylidene; 10b) and the multidentate ether-functionalized selone L′′Se {L′′ = 1,3-bis[2-(2-methoxyethoxy)ethyl]benzimidazol-2-ylidene; 10c} with soft transition-metal halides (PdX2, PtX2, ZnX2, CdX2 and HgX2; X = Cl, Br, I) are probed. Compounds 10a and 10c react with metal halides to give complexes of the type [Cu2(μ-X)2(LSe)2] (X = Br, I; 11, 12), [MX2(LSe)2] (13–22) or [M2X2(μ-X)2(L′′Se)2] (X = Cl, Br, I; 26–32), whereas 10b and HgX2 (X = Cl, Br, I) form 1:1 complexes HgX2(L′Se) (21–23), in which the pyridine moiety coordinates to the metal centre to form a six-membered chelate. The reactivity of 10a was compared with those of triphenylphosphine and triethylamine. The reaction of 10c with molecular iodine yields the diiodoselone L′′SeI2 (35), which disproportionates to give the selone adduct of the iodonium ion, [(L′′Se)2I]+I3– (36). The reactions of LSeX2 [X = Cl (34a), Br (34b), I (34c)] with organotellurium compounds, namely, tellone LTe (10d) and diphenyl telluride (37), afford the dihalotellones LTeX2 [X = Cl (38a), Br (38b), I (38c)] and Ph2TeX2 [X = Cl (39a), Br (39b), I (39c)], respectively. The oxidizing properties of LSeX2 (34a–34c) were investigated with rare-earth metals.
Theoretical and experimental studies on formation of diethylzinc-triphenylphosphine complex
Sadhana, Venkatesh,Das, Dhrubjyoti,Sravania, Chinduluri,Sivaramakrishna, Akella,Vijayakrishna, Kari,Clayton, Hadley S.
, p. 35 - 40 (2016/01/25)
This work is mainly focused on understanding the complex-forming behavior of diethylzinc with neutral phosphine ligands such as triphenylphosphine (PPh3) to yield [Zn(PPh3)2Et2]. The complex formation in solution is observed in the presence of a large exc
Synthesis, structural characterization and anticancer activity of some new complexes of 6-amino-4-hydroxy-2-thiopyrimidine
Elsayed, Shadia A.,Jean-Claude, Bertrand J.,Butler, Ian S.,Mostafa, Sahar I.
, p. 208 - 214 (2013/01/15)
New complexes of 6-amino-4-hydroxy-2-thiopyrimidine (Hahtp), [Zn(ahtp) 2(H2O)2], [Zn(ahtp)2(PPh 3)(H2O)], [Zn(Hahtp)(bpy)Cl2], [Pd(phen)(ahtp]Cl, [Pd(Hahtp)(PPh3)2]Cl2, [Ag(ahtp)(H2O)2], [Ag(ahtp)(PPh3)(H 2O)], [Ag(ahtp)L] (L = bpy, phen), have been synthesized and characterized on the basis of spectral (IR, 1H-NMR, ESI-mass and UV-visible), elemental analysis, thermal and molar conductivity measurements. Three modes of chelations have been observed for Hahtp; as a neutral bidentate ligand through cyclic nitrogen and thione sulfur atoms, mononegative bidentate ligand through either the deprotonated cyclic nitrogen and thione sulfur atoms or the deprotonated hydroxy and cyclic nitrogen atoms; all forming four-membered chelating rings. The free Hahtp and its complexes, [Zn(ahtp)2(H 2O)2], [Zn(Hahtp)2(PPh3)(H 2O)], [Zn(Hahtp)(bpy)Cl2], [Pd(phen)(Hahtp]Cl and [Ag(Hahtp)(PPh3)(H2O)] have been tested against the human breast cancer MDA-MB231 cell line. The [Ag(ahtp)(PPh3)(H 2O)] complex exhibits the highest efficacy with a mean IC 50 value of 4.7 μM.
