Stable mononuclear rhodium(II) polypyridyl complexes: synthesis, spectroscopic and structural characterisation

Paul, Parimal; Tyagi, Beena; Bilakhiya, Anvarhusen K.; Bhadbhade, Mohan; Suresh, Eringathodi

doi:10.1039/a900757a

Cited by 43 publications

(25 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ni-N (triazine) bond lengths in two tptz moieties, smaller than the Ni-N (pyridyl) bond lengths (Table 2), compared well with the reported Ni-N distances for Ni complexes [3,39,40,54]. In complex (2) there is a CH 3 CN solvent molecule and two PF 6 -counter ions. The P-F bond lengths range from 1.599(4) to 1.611(4) Å with an average length of 1.603(4) Å .…”

Section: Resultssupporting

confidence: 60%

“…The two tptz moieties are coplanar with the two uncoordinated pyridyl rings twisted with respect to the central triazine rings. The lattice structure is stabilized by a network of weak hydrogen bonds between pyridyl rings of the tptz and the F atoms of the PF 6 -anions, with an average C-HÁÁÁF distances of 2.3 Å , and N atom of the CH 3 CN molecule with the closest NÁÁÁH distance of 2.7 Å that can be considered meaning full interactions. Due to the presence of PF 6 -counter ions located between neighboring complex cations, the triazine and/or pyridyl rings in each cation cannot interact in a p-p fashion as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…FT-IR spectra were recorded on a FT-IR JASCO 680-PLUS spectrophotometer and electronic spectra on a JASCO-570 spectrophotometer. 1 H-NMR spectra were recorded on a Bruker DRX-500 MHz Avance spectrometer at ambient temperature in DMSO-d 6 . Cyclic voltammograms were recorded on a SAMA Research Analyzer M-500.…”

Section: Materials and Physical Techniquesmentioning

confidence: 99%

“…Among the polypyridyl ligands, tptz has drawn much attention because of its multiple coordination sites (major, middle, and minor) [3] (scheme 1) and large stabilizing p systems [4][5][6]. At first, it has been used as an analytical reagent for various metals.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Nickel(II) polypyridyl Complexes of 2,4,6-Tris(2-pyridyl)-1,3,5-triazine

et al. 2012

View full text Add to dashboard Cite

The synthesis, purification, characterization, electrochemical properties, and fluorescence quenching of two new mononuclear Ni(II) complexes, [Ni(tptz) (CH 3 OH)Cl 2 ] (1) and [Ni(tptz) 2 ](PF 6 ) 2 ÁCH 3 CN (2), containing the ligand 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) are described. Solid state structures of both complexes have been determined by single crystal X-ray crystallography. In (1) and (2), the Ni(II) metal centers use the major coordination site of the tptz ligand and the coordination geometry around the Ni(II) is a distorted octahedron. The free tptz ligand has three emission bands that are assigned to the 1 (p-p * ) and 1 (n-p * ) states. The fluorescence spectra of (1) and (2) show that the fluorescence quenching of the tptz fluorophore proceeds via an energy transfer process. Magnetic susceptibility data derived from paramagnetic NMR revealed effective magnetic moments of 2.75 l B for (1), and 2.91 l B for (2) at room temperature. Cyclic voltammetry of (1) shows that the Ni(III/II) reduction couple is quasi-reversible whereas in complex (2), the Ni(II/I) couple indicates an electrochemical (EC) mechanism.

show abstract

Section: Resultssupporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Section: Materials and Physical Techniquesmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Nickel(II) polypyridyl Complexes of 2,4,6-Tris(2-pyridyl)-1,3,5-triazine

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The rhodium centre is further surrounded by the two 1,10-phenanthroline ligands and the sixth coordination site is taken up by a pyridine ring of the bpt ligand. Two disordered PF 6 Ϫ counterions [13,14] The Xray structure of a ruthenium(II) complex with the ligand Hbpt has also been reported. [15] The NMR spectrum shown in Figure 2 clearly indicates the presence of only one species, indicative of the absence of linkage isomers.…”

Section: Resultsmentioning

confidence: 99%

Rhodium Mediated N−O Bond Formation

Burke

Gallagher

Indelli

et al. 2002

Eur. J. Inorg. Chem.

View full text Add to dashboard Cite

Reaction of [Rh(phen)2Cl2]Cl (phen = 1,10‐phenanthroline) with the ligand 3,5‐bis(pyridin‐2‐yl)‐1,2,4‐triazole (Hbpt) in H2O at pH 9 gives rise to the formation of a single stable compound. Single‐crystal X‐ray analysis of this material reveals that in the product obtained an oxygen atom has been inserted between the Rh(phen)2 moiety and the triazole ring of the bpt ligand yielding a compound of the type [Rh(phen)2(Obpt)](PF6)2·0.767CH3CN·0.28H2O. Insertion of oxygen in this manner has not been reported previously. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)

show abstract

Novel one‐dimensional polymeric Cu(II) complexes via Cu(II)‐assisted hydrolysis of the 2,4‐bis(3,5‐dimethyl‐1H‐pyrazol‐1‐yl)‐6‐methoxy‐1,3,5‐triazine pincer ligand: Synthesis, structure, and antimicrobial activities

Soliman

El‐Faham

Silk

2020

Applied Organom Chemis

View full text Add to dashboard Cite

Two unexpected one-dimensional coordination polymers, [Cu(PT)(H 2 O)Cl] n 1 and [Cu 2 (BPT)(ClO 4) 3 (H 2 O) 4 ] n Á2nH 2 O 2, of symmetrical triazine-based ligands were synthesized by Cu(II)-mediated hydrolysis of the 2,4-bis (3,5-dimethyl-1H-pyrazol-1-yl)-6-methoxy-1,3,5-triazine (MBPT) pincer ligand. The reaction of Cu(ClO 4) 2 Á6H 2 O with MBPT proceeded via hydrolysis of the methoxy group to produce the dicompartmental 4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazin-2(1H)-one ligand (HBPT) that then undergoes in situ complexation with Cu(II) to afford 2. In case of CuCl 2 , the reaction proceeds further with C-N cleavage of one pyrazolyl unit leading to the formation of 6-(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazine-2,4(1H,3H)-dione ligand (HPT) that also undergoes in situ complexation with Cu(II) affording 1. The role of Cu(II) is to increase the Lewis acid reactivity of the water molecule where similar hydrolytic reactions for MBPT were observed in acidic medium in presence of an aqueous HCl (1:1 v/v) solution. The molecular and supramolecular structures of complexes 1 and 2 were investigated using X-ray diffraction of single crystal, Hirshfeld analysis, and density functional theory calculations. The Cl…H (11.7%) and O…H (24.7%) contacts are the most important in 1, whereas the molecular packing of 2 is controlled mainly by the O…H (58.7%) hydrogen bonds. Complex 2 showed better activity against Escherichia coli, Bacillus subtilis, and Candida albicans compared with the standard antibiotics amoxicillin, tetracycline, and ampicillin. In general, complexes 1 and 2 showed good antimicrobial activity than these antibiotics and have the advantage to be used as both antibacterial and antifungal agents.

show abstract

Stable mononuclear rhodium(II) polypyridyl complexes: synthesis, spectroscopic and structural characterisation

Cited by 43 publications

References 32 publications

Nickel(II) polypyridyl Complexes of 2,4,6-Tris(2-pyridyl)-1,3,5-triazine

Nickel(II) polypyridyl Complexes of 2,4,6-Tris(2-pyridyl)-1,3,5-triazine

Rhodium Mediated N−O Bond Formation

Novel one‐dimensional polymeric Cu(II) complexes via Cu(II)‐assisted hydrolysis of the 2,4‐bis(3,5‐dimethyl‐1H‐pyrazol‐1‐yl)‐6‐methoxy‐1,3,5‐triazine pincer ligand: Synthesis, structure, and antimicrobial activities

Contact Info

Product

Resources

About