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Sakata K, Miyamoto Y, Hashimoto M, Tsuge A. Preparation, Spectroscopic Properties and Characterization of Oxovanadium(IV), Isothiocyanatomanganese(III), Cyanocobalt(III) and Cobalt(II) Complexes with a Bis-Crown Ether Tetraaza[14]Annulene. J COORD CHEM 2010. [DOI: 10.1080/0095897021000041194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Kazunori Sakata
- a Department of Applied Chemistry, Faculty of Engineering , Kyushu Institute of Technology , Tobata-ku, Kitakyushu, 804-8550, Japan
| | - Yasushi Miyamoto
- a Department of Applied Chemistry, Faculty of Engineering , Kyushu Institute of Technology , Tobata-ku, Kitakyushu, 804-8550, Japan
| | - Mamoru Hashimoto
- a Department of Applied Chemistry, Faculty of Engineering , Kyushu Institute of Technology , Tobata-ku, Kitakyushu, 804-8550, Japan
| | - Akihiko Tsuge
- a Department of Applied Chemistry, Faculty of Engineering , Kyushu Institute of Technology , Tobata-ku, Kitakyushu, 804-8550, Japan
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Cyclic voltammetry and spectroelectrochemical study of nickel and cobalt diphenyltetraazaannulene complexes. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2007.03.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Li SW, Cheng YM, Yeh YS, Hsu CC, Chou PT, Peng SM, Lee GH, Tung YL, Wu PC, Chi Y, Wu FI, Shu CF. Interplay between Intra- and Interligand Charge Transfer with Variation of the Axial N-Heterocyclic Ligand in Osmium(II) Pyridylpyrazolate Complexes: Extensive Color Tuning by Phosphorescent Solvatochromism. Chemistry 2005; 11:6347-57. [PMID: 16086340 DOI: 10.1002/chem.200500434] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The rational design and syntheses of a new series of Os(II) complexes with formula [Os(fppz)(2)(CO)(L)] (1: L=4-dimethylaminopyridine; 2: L = pyridine; 3: L = 4,4'-bipyridine; 4: L = pyridazine; 5: L = 4-cyanopyridine), bearing two (2-pyridyl)pyrazolate ligands (fppz) together with one carbonyl and one N-heterocyclic ligand at the axial positions are reported. Single-crystal X-ray diffraction studies of, for example, 2 reveal a distorted octahedral geometry in which both fppz ligands reside in the equatorial plane with a trans configuration and adopt a bent arrangement at the metal center with a dihedral angle of approximately 23 degrees , while the carbonyl and pyridine ligands are located at the axial positions. Variation of the axial N-heterocyclic ligand leads to remarkable changes in the photophysical properties as the energy gap and hence the phosphorescence peak wavelength can be tuned. For complexes 1 and 2 the solvent-polarity-independent phosphorescence originates from a combination of intraligand (3)pi-pi* ((3)ILCT) and metal-to-ligand charge transfer transitions ((3)MLCT). In sharp contrast, as supported by cyclic voltammetry measurements and theoretical calculations, complexes 3--5 exhibit mainly ligand-to-ligand charge transfer (LLCT) transitions, resulting in a large dipolar change. The phosphorescence of complexes 3--5 thus exhibits a strong dependence on the polarity of the solvent, being shifted for example, from 560 (in C(6)H(12)) to 665 nm (in CH(3)CN) and from 603 (in C(6)H(12)) to 710 nm (in CH(3)CN) for complexes 3 and 5, respectively. The results clearly demonstrate that a simple, straightforward derivatization of the axial N-heterocyclic ligand drastically alters the excitation properties per se from intraligand charge transfer (ILCT) to LLCT transitions. The latter exhibit remarkable LLCT phosphorescence solvatochromism so that a broad range of color tunability can be achieved.
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Affiliation(s)
- Shih-Wen Li
- Department of Chemistry and Instrumentation Center, National Taiwan University, Taipei
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Hamza MSA, Pratt JM. The chemistry of vitamin B12. Part 30. Co-ordination of amines, pyridines and diazines by aquacyanocobinamide; nitrogen-containing bases as probes for basicity and other effects in metal–ligand bonding. ACTA ACUST UNITED AC 1994. [DOI: 10.1039/dt9940001377] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hashimoto M, Sakata K. Oxidation of (7,16-diethyl-5,6,7,8,9,14,15,16,17,18-decahydrodibenzo[b,i][1,4,8,11]tetraazacyclotetradecine)nickel(II) complexes. J Heterocycl Chem 1992. [DOI: 10.1002/jhet.5570290234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Preparation and axial ligation behavior of cyano(7, 16-diethyl-(E)-or-(Z)-dipyrido [b,i][1,4,8,11] tetraazacyclotetradecinato)cobalt(III). Inorganica Chim Acta 1989. [DOI: 10.1016/s0020-1693(00)80780-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Sakata K, Kuroda M, Yanagida S, Hashimoto M. Preparation and spectroscopic properties of oxovanadium(IV) and dioxomolybdenum(VI) complexes with tetraaza[14]annulenes containing pyridine rings. Inorganica Chim Acta 1989. [DOI: 10.1016/s0020-1693(00)90375-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sakata K, Hashimoto M. Characterization and spectral properties of (7,8,16,17-Tetrahydrodibenzo [b,j] [1,4,8,11] tetraazacyclo-tetradecinato)cobalt(II). Inorganica Chim Acta 1988. [DOI: 10.1016/s0020-1693(00)80599-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sakata K, Kikutake T, Shigaki Y, Hashimoto M, Iyehara Ogawa H, Kato Y. Catalytic oxidations of hydroquinones and 1,2-diphenylhydrazine in the presence of (dibenzo [b,i] [1,4,8,11] tetraazacyclotetradecinato)cobalt(II). Inorganica Chim Acta 1988. [DOI: 10.1016/s0020-1693(00)80957-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sakata K, Wada S, Sato N, Kurisu M, Hashimoto M, Kato Y. Preparation and spectroscopic properties of cobalt(III), nickel(II), copper(II) and zinc(II) complexes with a novel saturated macrocyclic ligand: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22-docosahydrodibenzo-[b,i][1,4,8,11]tetraazacyclotetradecine. Inorganica Chim Acta 1986. [DOI: 10.1016/s0020-1693(00)84329-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Sakata K, Hayashida Y, Hashimoto M, Terada KI, Kato Y. Preparation and characterization of cobalt(II) complexes with novel macrocyclic N4-ligands: 5,14-dihydro-7,16-diethyl-(E)-dipyrido[b,i][1,4,8,11]-tetraazacyclotetradecine and 5,14-dihydro-7,16-diethyl-(Z)-dipyrido[b,i][1,4,8,11]tetraazacyclotetradecine. Inorganica Chim Acta 1985. [DOI: 10.1016/s0020-1693(00)85224-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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