Synthesis and spectroscopic characterization of tin(II) and tin(IV) complexes containing 2,3,5,6-tetrakis(alpha-pyridyl)pyrazine as a bridging ligand

Bitzer, Rodrigo S.; Teles, Wagner M.; Abras, A.; Ardisson, José D.; Filgueiras, Carlos A. L.

doi:10.1590/s0103-50532005000600012

Cited by 7 publications

(5 citation statements)

References 23 publications

(53 reference statements)

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“…This observation reinforces the idea that the intramolecular π-π interactions present in 2 are the chief causes of the observed configuration. These terminal aromatic rings present a dihedral angle of 7.20 (1) An analysis of the supramolecular arrangement of 2 shows the formation of a dimer with an inversion center formed by C7-H7 … O2 i interactions, which are at the limit between van der Waals interactions and non-classical hydrogen bonds, as shown in Figure 3 [symmetry (i) = 2-x, 2-y, -z]. Clusters of these dimers form tectons [34][35][36] using non-classical C35-H35 … Cl2…”

Section: Ortep-3mentioning

confidence: 99%

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Synthesis, structural and spectroscopic studies of novel azo-containing N,O-bonded complexes in the α-Iminoketone and Azophenolate forms

Visentin¹,

Ferreira²,

Bordinhão³

et al. 2010

J. Braz. Chem. Soc.

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Este artigo descreve a síntese e a caracterização espectroscópica e estrutural por difratometria de raios X em monocristal de dois novos complexos contendo o grupamento azo, cis-bis[4-nitro-2-(4-nitrofenilazo)-fenolato-κN 1 ]bis(piridino-κN)cádmio(II), 1, e cis-bis[2-(4-fenilazofenilimino)-2H-acenafteno-1-ona]dicloromercúrio(II), 2. Embora os ligantes e os metais sejam diferentes, observa-se para os dois complexos uma coordenação do tipo N,O-bidentada ao átomo central. Em 1, a coordenação é feita por um átomo de N do grupo azo e por um átomo de O do grupo fenolato, enquanto em 2 a coordenação ocorre exclusivamente via átomos de O e N da α-iminocetona. Ambos os complexos exibem interações intramoleculares do tipo π-π, que exercem um importante papel na determinação de suas estruturas moleculares, além de também exibirem arranjos supramoleculares governados por ligações de hidrogênio não-clássicas. Em adição, a estrutura de 2 é a primeira relatada na literatura com um novo tipo de ligante, a azo-iminocetona, e também a primeira contendo mercúrio complexado a uma α-iminocetona. This article describes the synthesis and the spectroscopic and structural characterization of two novel azo-containing complexes, cis-bis[4-nitro-2-(4-nitrophenylazo)-phenolate-κN 1 ] bis(piridino-κN)cadmium(II), 1, and cis-bis[2-(4-phenylazo-phenylimino)-2H-acenaphthylen-1-one]dichloromercury(II), 2. In spite of the different metal centres, both complexes show an N,Obidentate complexation to the metal. In 1 the metal coordinates to an azo N and to a phenolate O atom, whereas in 2 the metal binds to an O and an N atom of the α-iminoketone. Both complexes show intramolecular π-π interactions, which play an important role in their molecular structures. In addition they also present non-classical H-bonding, which is crucial to their supramolecular arrangements. Moreover, 2 is the first case in the literature of a complex with a new class of ligand, an azoiminoketone, as well as the first case of an α-iminoketone Hg complex.

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Section: Ortep-3mentioning

confidence: 99%

“…1 These substances show important chemical and physical properties, leading to new compounds with unique characteristics. [2][3][4] Specific aromatic diazenes are the dominant class of synthetic organic colorants.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural and spectroscopic studies of novel azo-containing N,O-bonded complexes in the α-Iminoketone and Azophenolate forms

Visentin¹,

Ferreira²,

Bordinhão³

et al. 2010

J. Braz. Chem. Soc.

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“…Further, the shifting of the azomethine (−CH=N-) carbon signal in the spectra of the tin(II) compounds as compared to the free ligands, clearly indicates that the coordination through azomethine nitrogen to the tin atom. [29][30][31] which is below the reported values for tri-coordinated hydrated tin(II) chloride. Therefore, a fourcoordinate distorted tetrahedral geometry have been proposed for resulting tin(II) complexes (Fig.-2).…”

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confidence: 56%

Spectral, DFT and Antibacterial Studies of Tin(ii) Complexes of Schiff Bases Derived From Aromatic Aldehyde and Amino Acids

2017

Rasayan J Chem

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New tin(II) complexes of -amino acid Schiff bases (HL) derived from condensation of various -amino acids (tryptophan, phenylalanine, valine, isolecine, methionine, alanine, cysteine, serine, aspartic acid) and aromatic aldehyde were synthesized. The molar conductance low vales reveal that all the tin(II) complexes were nonelectrolytes. The structure of complexes were proposed in light of analytical techniques, infra-red, multinuclear magnetic resonance ( Sn), UV-Vis spectral data and theoretical studies. On the basis of these studies, complexes have distorted tetrahedral geometry. 3D structure of the newly synthesized compounds were studied by DFT/B3LYP method, also the theoretical parameters, HOMO, LUMO and dipole moments were calculated to confirm the geometry of the ligands and its tin(II) complexes. Few representative Schiff bases and its tin(II) complexes were screened for antibacterial activities. The tin(II) complexes have higher antibacterial activity than the free ligands.

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“…Among them, the bidentate modes ( Fig. 1) [12,13,17,20,27] bis-bidentate(A) coordination mode ( Fig. 1) [27], and the present work deals with yet another example of this mode.…”

Section: Introductionmentioning

confidence: 92%

A contribution to the coordination chemistry of 2,3,5,6-tetrakis(α-pyridyl)pyrazine (TPP): Synthesis, spectroscopy, electrochemistry, and density-functional study of {[Mo(CO)4]2(μ-TPP)}

Bitzer

Pereira

Rocco

et al. 2006

Journal of Organometallic Chemistry

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Synthesis and spectroscopic characterization of tin(II) and tin(IV) complexes containing 2,3,5,6-tetrakis(alpha-pyridyl)pyrazine as a bridging ligand

Cited by 7 publications

References 23 publications

Synthesis, structural and spectroscopic studies of novel azo-containing N,O-bonded complexes in the α-Iminoketone and Azophenolate forms

Synthesis, structural and spectroscopic studies of novel azo-containing N,O-bonded complexes in the α-Iminoketone and Azophenolate forms

Spectral, DFT and Antibacterial Studies of Tin(ii) Complexes of Schiff Bases Derived From Aromatic Aldehyde and Amino Acids

A contribution to the coordination chemistry of 2,3,5,6-tetrakis(α-pyridyl)pyrazine (TPP): Synthesis, spectroscopy, electrochemistry, and density-functional study of {[Mo(CO)4]2(μ-TPP)}

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