Synthesis of new palladium(II) complexes containing tetradentate-nitrogen donor ligands: Combined structural studies by NMR spectroscopy and X-ray crystallography

Espinal, Mònica; Pons, Josefina; García‐Antón, Jordi; Soláns, Xavier; Font-Bardı́a, Mercè; Ros, Josep

doi:10.1016/j.ica.2007.11.011

Cited by 14 publications

(4 citation statements)

References 32 publications

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“…The largest distortion from regular square planar geometry is shown in the trans O-Cu-N angles [145.69(11)°and 140.36(11)°]. In similar structures the geometry around the metal centre was also considered as distorted square planar coordination with significant tetrahedral distortion [62][63][64][65][66][67][68]. Due to the coordination of the metal ion to the phenolic oxygen, reduced bond distances were observed for coordinated C-O [O1-C2 = 1.329(4) Å] compared to non-coordinated C-O [O4-C4 = 1.359(4) Å] bond lengths.…”

Section: Crystal Structure Of Copper(ii) Complexes 2a and 8amentioning

confidence: 99%

Anticancer and antifungal activity of copper(II) complexes of quinolin-2(1H)-one-derived Schiff bases

Creaven

Duff

Egan

et al. 2010

Inorganica Chimica Acta

207

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a b s t r a c tThe condensation of substituted aromatic aldehydes with 7-amino-4-methyl-quinolin-2(1H)-one (1) has lead to the isolation of quinolin-2(1H)-one derived Schiff bases (2-14). The copper(II) complexes (2a-14a) of the ligands were also prepared, and together with their corresponding free ligands were fully characterised by elemental analyses, spectral methods (IR, 1 H and 13 C NMR, AAS, UV-Vis), magnetic and conductance measurements. The bidentate ligands coordinated to the copper(II) ion through the deprotonated phenolic oxygen and the azomethine nitrogen of the ligands in almost all cases. X-ray crystal structures of two of the complexes, 5a and 8a, confirmed the bidentate coordination mode. All of the compounds were investigated for their antimicrobial activities against the fungus, Candida albicans, and against Gram-positive and Gram-negative bacteria. The compounds were found to have excellent antiCandida activity but were inactive against Staphylococcus aureus and Escherichia coli. Selected compounds (2-8 and 2a-8a) were also screened for their in vitro anticancer potential using the human hepatic carcinoma cell line, Hep-G 2 . Several derivatives were shown to be active comparable to that of cisplatin.

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Section: Crystal Structure Of Copper(ii) Complexes 2a and 8amentioning

confidence: 99%

Anticancer and antifungal activity of copper(II) complexes of quinolin-2(1H)-one-derived Schiff bases

Creaven

Duff

Egan

et al. 2010

Inorganica Chimica Acta

207

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“…For the six-membered rings, the values of N(2)-Pd (1) (13)°a nd N am PdN am bite angle is 87.60(12)°] [5]. The differences observed in the angles are probably caused by the rigidity provoked by the piperazine cycle.…”

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confidence: 94%

“…The values of Pd-N pz (2.0334(17) and 2.0292(18) Å A 0 ) and Pd-N am (2.0270(18) and 2.0401(17) Å A 0 ) bond distances can be regarded as normal compared to the distances found in the literature (Pd-N pz between 1.899-2.040 Å A 0 and Pd-N am between 1.986-2.123 Å A 0 ) [4d, 5,16]. The structure of the ½Pd 2 Cl 4 ðl-SMeÞ 2 2À anionic unit consists of two slightly distorted square-planar Pd atoms, two S-bridging methylthiolate ligands and four terminal chlorine atoms.…”

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confidence: 99%

Unexpected formation of [Pd(bedp)][Pd2Cl4(μ-SMe)2] (bedp = 1,4-bis[2-(3,5-dimethyl-1-pyrazolyl)ethyl]piperazine). Structural characterisation and spectroscopic properties

Espinal

Pons

García‐Antón

et al. 2009

Inorganic Chemistry Communications

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“…For example, Driessen et al have synthesized and characterized bi‐ and tridentate pyrazole ligands such as 1‐[2‐ethylamino]ethyl]‐3,5‐dimethylpyrazole(deae), bis‐[3,5‐dimethylpyrazolyl]methyl]ethylamine (bdmae), and bis‐[(3,5‐diemtylpyrazolyl)ethyl]ethylamine (ddae). Metal complexes with N ‐alkylaminopyrazole ligands, including Rh(I), Ru(II), Pd(II), Pt(II), Zn(II), and Co(II) complexes, have exhibited a variety of potentially useful chemical properties . Although there have been many reports describing transition metal complexes ligated to chelating pyrazolyl ligands, some recent studies have documented the use of transition metals, specifically cadmium, catalysts for olefin polymerization and methyl methacrylate (MMA) polymerization .…”

Section: Introductionmentioning

confidence: 99%

X‐ray crystal structures and MMA polymerization of cadmium(II) complexes with bidentate pyrazole ligands: the formation of monomers or dimers as a function of a methyl substituent on the pyrazole and aniline rings

Kim

Woo

et al. 2014

Applied Organom Chemis

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The reaction of CdBr 2 ·4H 2 O with ancillary ligands, N,N-bis(1H-pyrazolyl-1-methyl)aniline (L 1 ), N,N-bis(1H-pyrazolyl-1-methyl)-pmethylaniline (L 2 ), N,N-bis(1H-pyrazolyl-1-methyl)-3,5-dimethylaniline (L 3 ), N,N-bis(3,5-dimethyl-1H-pyrazolyl-1-methyl)aniline (L 4 ) and N,N-bis(1H-pyrazolyl-1-methyl)-2,6-dimethylaniline (L 5 ) in ethanol yields novel Cd(II) bromide a bromo-bridged dimeric species with crystallographic inversion symmetry. Conversely, [L 4 CdBr 2 ] and [L 5 CdBr 2 ] exist as monomeric complexes, presumably due to the steric hindrance between the methyl substituents of the two pyrazole groups in the ligand and cadmium centre for [L 4 CdBr 2 ], and crowding around the cadmium metal by methyl substituents on the aniline residue in the ligand for [L 5 CdBr 2 ]. The geometry at each Cd(II) centre for [L 1 CdBr 2 ] 2 , [L 2 CdBr 2 ] 2 and [L 3 CdBr 2 ] 2 is best described as a distorted trigonal bipyramid. A distorted trigonal bipyramid is achieved in [L 4 CdBr 2 ] by coordinative interaction of the nitrogen atom of the aniline unit and the cadmium atom with a σ plane of symmetry, based on the bond length of Cd-N aniline (2.759(7) Å). [L 5 CdBr 2 ] exists with a distorted tetrahedral geometry involving non-coordination of the nitrogen atom of aniline and the Cd centre, resulting in the formation of an eight-membered chelate ring. The catalytic activity of monomeric, five-coordinated [L 4 CdBr 2 ] in the polymerization of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) at 60°C resulted in a higher molecular weight and a narrower polydispersity index (PDI) than those obtained with dimeric [L n CdBr 2 ] 2 (L n = L 1 , L 2 , L 3 ) or monomeric tetrahedral [L 5 CdBr 2 ].

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Synthesis of new palladium(II) complexes containing tetradentate-nitrogen donor ligands: Combined structural studies by NMR spectroscopy and X-ray crystallography

Cited by 14 publications

References 32 publications

Anticancer and antifungal activity of copper(II) complexes of quinolin-2(1H)-one-derived Schiff bases

Anticancer and antifungal activity of copper(II) complexes of quinolin-2(1H)-one-derived Schiff bases

Unexpected formation of [Pd(bedp)][Pd2Cl4(μ-SMe)2] (bedp = 1,4-bis[2-(3,5-dimethyl-1-pyrazolyl)ethyl]piperazine). Structural characterisation and spectroscopic properties

X‐ray crystal structures and MMA polymerization of cadmium(II) complexes with bidentate pyrazole ligands: the formation of monomers or dimers as a function of a methyl substituent on the pyrazole and aniline rings

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