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Müller C, Wintergerst P, Nair SS, Meitinger N, Rau S, Dietzek-Ivansic B. Link to glow - iEDDA conjugation of a Ruthenium(II) tetrazine complex leading to dihydropyrazine and pyrazine complexes with improved 1O2 formation ability. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY 2022. [DOI: 10.1016/j.jpap.2022.100130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Kalhor HR, Nazari Khodadadi A. Synthesis and Structure Activity Relationship of Pyridazine-Based Inhibitors for Elucidating the Mechanism of Amyloid Inhibition. Chem Res Toxicol 2018; 31:1092-1104. [DOI: 10.1021/acs.chemrestox.8b00210] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Hamid Reza Kalhor
- Biochemistry Research Laboratory, Department of Chemistry, Sharif University of Technology, Tehran 111559516, Iran
| | - Alireza Nazari Khodadadi
- Biochemistry Research Laboratory, Department of Chemistry, Sharif University of Technology, Tehran 111559516, Iran
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Saldías M, Manzur J, Palacios RE, Gómez ML, Fuente JDL, Günther G, Pizarro N, Vega A. The binuclear dual emitter [Br(CO) 3Re(PN)(NP)Re(CO) 3Br] (PN): 3-chloro-6-(4-diphenylphosphinyl)butoxypyridazine, a new bridging P,N-bidentate ligand resulting from the ring opening of tetrahydrofuran. Dalton Trans 2018; 46:1567-1576. [PMID: 28091640 DOI: 10.1039/c6dt04158b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lithium diphenylphosphide unexpectedly provokes the ring-opening of tetrahydrofuran (THF) and by reaction with 3,6-dichloropyridazine leads to the formation of the ligand 3-chloro-6-(4-diphenylphosphinyl)butoxypyridazine (P⋯N), which was isolated. The reaction of this ligand with the (Re(CO)3(THF)Br)2 dimer yields the novel complex [Br(CO)3Re(μ-3-chloro-6-(4-diphenylphosphinyl)butoxypyridazine)2Re(CO)3Br] (BrRe(P⋯N)(N⋯P)ReBr), which was crystallized in the form of a chloroform solvate, (C46H40Br2Cl2N4O8P2Re2)·(CHCl3). The monoclinic crystal (P21/n) displays a bimetallic cage structure with a symmetry inversion centre in the middle of the rhenium to rhenium line. The molecule shows two oxidation signals occurring at +1.50 V and +1.76 V which were assigned to the ReI/ReII and ReII/ReIII metal-centered couples, respectively, while signals observed at -1.38 V and -1.68 V were assigned to ligand centered reductions. Experimental and DFT/TDDFT results indicate that the UV-Vis absorption maximum of BrRe(P⋯N)(N⋯P)ReBr occurring near 380 nm displays a metal to ligand charge transfer (MLCT) character, which is consistent with CV results. Upon excitation at this wavelength, a weak emission (Φem < 1 × 10-3) is observed around 580 nm (in dichloromethane) which decays with two distinct lifetimes τ1 and τ2 of 24 and 4.7 ns, respectively. The prevalence of non-radiative deactivation pathways is consistent with efficient internal conversion induced by the high conformational flexibility of the P⋯N ligand's long carbon chain. Measurements in a frozen solvent at 77 K, where vibrational deactivation is hindered, show intense emission associated with the 3MLCT state. These results demonstrate that BrRe(P⋯N)(N⋯P)ReBr preserves the dual emitting nature previously reported for the mononuclear complex RePNBr, with emission associated with and states.
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Affiliation(s)
- Marianela Saldías
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas. Quillota 980, Viña del Mar, Chile.
| | - Jorge Manzur
- Universidad De Chile, Facultad de Ciencias Físicas y Matemáticas, Departamento de Ciencias de los Materiales, Av. Tupper 2460, Santiago, Chile
| | - Rodrigo E Palacios
- Universidad Nacional de Rio Cuarto y CONICET, Facultad de Ciencias Exactas Fisicoquímicas y Naturales, Departamento de Química, Campus Universitario, 5800 Río Cuarto, Córdoba, Argentina
| | - María L Gómez
- Universidad Nacional de Rio Cuarto y CONICET, Facultad de Ciencias Exactas Fisicoquímicas y Naturales, Departamento de Química, Campus Universitario, 5800 Río Cuarto, Córdoba, Argentina
| | - Julio De La Fuente
- Universidad De Chile, Facultad de Ciencias Químicas y Farmacéuticas, Departamento de Química Orgánica y Fisicoquímica, Sergio Livingstone 1007, Santiago, Chile
| | - Germán Günther
- Universidad De Chile, Facultad de Ciencias Químicas y Farmacéuticas, Departamento de Química Orgánica y Fisicoquímica, Sergio Livingstone 1007, Santiago, Chile
| | - Nancy Pizarro
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas. Quillota 980, Viña del Mar, Chile.
| | - Andrés Vega
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas. Quillota 980, Viña del Mar, Chile. and Centro para el Desarrollo de la Nanociencia y la Nanotecnología, CEDENNA, Chile
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