Rhodium(III) and cadmium(II) complexes based on the polypyridyl ligand 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz)

Hadadzadeh, Hassan; Hosseinian, Seyedeh Raziyeh; Fatemi, S. Jamil. A.

doi:10.1016/j.poly.2009.05.072

Cited by 25 publications

(14 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reported separation between m(C=C) and m(C=N) is close to 20 cm -1 for polypyridyl compounds[37,55] and thus the observed vibrational absorption bands for (1) at 1575, 1559 and 1537 cm -1 may be due to either different m(C=N) vibrations involving the triazine and pyridyl rings or m(C=C) and m(C=N) vibrations with coincidental equivalence of the different aromatic rings. An intense band at 1,375 cm -1 is assigned to ring stretching of both the triazine and pyridyl rings.…”

mentioning

confidence: 91%

“…We have previously reported the crystal structures, luminescence, electrochemical, spectroelectrochemical, and magnetic properties of some polypyridyl complexes [29][30][31][32][33][34][35][36][37][38]. Many factors govern the redox, structure, luminescence, and quenching properties of polypyridyl complexes such as the type of substituents on the pyridyl rings, the oxidation states of the central metal, the thermodynamic stability of reduced or oxidized complexes in solution, the geometry, and the presence of electroactive spectator ligands.…”

mentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2012

Self Cite

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

mentioning

confidence: 91%

mentioning

confidence: 99%

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

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…[74] Hadadzadeh et al showed that cadmium polypyridyl complexes can also be used as advanced material for light emitting diode devices. [75] S C H E M E 1 Schematic diagram of the metal complex and the anchors In this article, we have calculated different properties of the tris bipyridine complex with different scarce and abundant metal ions coupled to well-known anchoring groups used for DSSCs (Scheme 1). [18,25,[76][77][78][79] Four of them (the first four in Scheme 1) have been used for the Ru-bipyridine dye for NiO p-SC by Pellegrin et al [18] First of all, we considered structural properties such as the interaction energy of the metal ions with the dye and the change of dihedral angles upon interaction with the various metal ions and different anchors.…”

Section: Introductionmentioning

confidence: 99%

Promising sensitizers for dye sensitized solar cells: A comparison of Ru(II) with other earth's scarce and abundant metal polypyridine complexes

Sen

Groß

2019

Int J of Quantum Chemistry

View full text Add to dashboard Cite

There has recently been a growing interest in dye sensitized solar cells (DSSCs) based on ruthenium metal, but due to the scarcity and high price of ruthenium, design of better and cheaper light adsorbent dyes based on more abundant metal ions is one of the key issues for future development of the DSSCs. Using density functional theory (DFT) and time‐dependent DFT we have studied the properties of new and abundant metal ion‐based polypyridyl dyes for p‐type DSSCs and compared with ruthenium and other scarce metal ions. Molecular geometries, electronic structures, and optical absorption spectra have been calculated using an implicit solvent corresponding to acetonitrile. The calculated fair light harvesting efficiency, high hole injection efficiency and Gibbs free energy for the hole injection and longer excited state lifetime (important for reflecting the efficiency of solar cells) for the new abundant metal ions (V3+ and Cr2+) based dyes could provide promising sensitizers for efficient next generation DSSC's for p‐SC.

show abstract

“…The strong emission at short wavelength of 1 may be due to the symmetry decrease and the conformational rigidity enhancement of the coordination polymer compared with the free bbi ligand, thereby reducing the loss of energy via non-radiative decay of the intra-ligand excited states. [31][32][33] These results reveal that complex 1 may be excellent candidate for potential photoluminescent material.…”

Section: 17mentioning

confidence: 78%

Synthesis, Crystal Structure and Luminescent Property of A Novel Cd(II) Coordination Polymer with Bis-imidazole Ligand

Zhou¹

2013

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

Research related to metal-organic coordination polymers has been a subject of great interest, not only from the view of potential applications, but also because of their intriguing architectures and framework topologies.1-3 The key to the successful design of metal-organic coordination polymers is the judicious selection of organic ligand.4 Recently, polydentate aromatic nitrogen heterocyclic ligands with fivemembered rings have been well-studied in the construction of supramolecular structure for their N-coordinated sites apt to coordinating to transition metals. Similar to six-membered N-heterocyclic ligands, the azole-based five-membered N-heterocyclic ligands, such as imidazoles, triazoles and tetrazoles have been extensively employed in the construction of various coordination polymers with diverse topologies and interesting properties.5-15 The bis(azole) ligands in which N-donor azole rings (imidazole, triazole, or tetrazole) are separated by alkyl, (CH 2 ) n , spacers are good choices for flexible bridging ligands. The conformational flexibility of the spacers makes the ligands adaptable to various coordination networks with one-, two-, and three dimensional structures. There are an increasing number of recently characterized, interesting frameworks incorporating flexible bridging ligands and metal ions have been reported. 16,17

show abstract

Rhodium(III) and cadmium(II) complexes based on the polypyridyl ligand 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz)

Cited by 25 publications

References 72 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

Promising sensitizers for dye sensitized solar cells: A comparison of Ru(II) with other earth's scarce and abundant metal polypyridine complexes

Synthesis, Crystal Structure and Luminescent Property of A Novel Cd(II) Coordination Polymer with Bis-imidazole Ligand

Contact Info

Product

Resources

About