1
|
Liang R, Xiong W, Lo KC, Ho PY, Bai X, Lai W, Chan WK, Du L, Phillips DL. Revealing the Photophysical Dynamics of Selected Rigid Donor-Acceptor Systems: From Ligands to Ruthenium(II) Complexes. J Phys Chem Lett 2021; 12:10927-10935. [PMID: 34734732 DOI: 10.1021/acs.jpclett.1c03122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Newly designed push-pull ligands (L1 and L2) with bithiophene (bth) as a donor and phenazine (phz) or quinoxalino[2,3-b]quinoxaline (qxq) as acceptors were synthesized and also incorporated with a bipyridyl Ru(II) complex to give Ru1 and Ru2, respectively. The ultrafast photophysical dynamics of the ligand and their respective Ru(II) complexes were well-characterized using time-resolved spectroscopies and quantum chemical calculations. Photoinduced charger transfer (CT) and intersystem crossing (ISC) processes were directly observed for L1 and L2. In addition, the interplay of three different triplet excited states was directly observed in the related Ru(II) complexes. The lowest-lying triplet excited states of the ligands and their respective Ru(II) complexes were both attributed to the CT transitions from donor (bth) to acceptor (phz or qxq) and result in 3ICT (intramolecular charge transfer) and 3ILCT (intraligand charge transfer) excited states, respectively. The lifetimes of the lowest-lying triplet excited states of L1, L2, Ru1, and Ru2 were measured to be 21.3, 50.4, 2.75, and 4.16 μs, respectively.
Collapse
Affiliation(s)
- Runhui Liang
- School of Life Sciences, Jiangsu University, Zhenjiang 212013, China
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Wenjuan Xiong
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Kin Cheung Lo
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Po Yuen Ho
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Xueqin Bai
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Wenquan Lai
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Wai Kin Chan
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Lili Du
- School of Life Sciences, Jiangsu University, Zhenjiang 212013, China
| | - David Lee Phillips
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, Hong Kong, China
| |
Collapse
|
2
|
Isakov D, Giereth R, Nauroozi D, Tschierlei S, Rau S. Two Emissive Long-Lived Excited States of an Imidazole-Functionalized Ruthenium Dipyridophenazine Complex. Inorg Chem 2019; 58:12646-12653. [PMID: 31532651 DOI: 10.1021/acs.inorgchem.9b01372] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A ruthenium(II) polypyridine-type complex based on the dipyridophenazine ligand with a directly fused imidazole unit (L1, dipyrido[3,2-a:2',3'-c]phenazine-10,11-imidazole) has been synthesized, and its electrochemical and photophysical properties have been studied. The cyclic voltammogram of [Ru(tbbpy)2(L1)]2+ (C1) (tbbpy is 4,4'-tert-butyl-2,2'-bipyridine) shows a cathodic shift of the phenazine-based reduction process compared to similar molecules, while the first detected reduction wave (-1.34 V vs Fc/Fc+) is assigned to the imidazole unit within the molecule. On the basis of the TD-DFT calculations, the strong visible absorption band exhibited by C1 is assigned to a metal-to-ligand charge transfer (MLCT) transition with a concurrent ligand-centered (LC) transition. At room-temperature, C1 features emission (Φ = 0.04) from its lowest excited states with time constants of 1.2 and 18.3 μs. These lifetimes are assigned to emission processes from the 3MLCT and 3LC state, respectively. This is the first time that a long-lived dual emission has been observed for a ruthenium(II) complex bearing a directly fused extended π-system. Furthermore, the emission of C1 is quenched upon water addition. In contrast to related compounds based on a dipyridophenazine ligand, the excited state energy is not shifted, and the lifetime is drastically decreased to 169 ns.
Collapse
Affiliation(s)
- Dajana Isakov
- Ulm University , Institute of Inorganic Chemistry I , Albert-Einstein-Allee 11 , 89081 Ulm , Germany
| | - Robin Giereth
- Ulm University , Institute of Inorganic Chemistry I , Albert-Einstein-Allee 11 , 89081 Ulm , Germany
| | - Djawed Nauroozi
- Ulm University , Institute of Inorganic Chemistry I , Albert-Einstein-Allee 11 , 89081 Ulm , Germany
| | - Stefanie Tschierlei
- Ulm University , Institute of Inorganic Chemistry I , Albert-Einstein-Allee 11 , 89081 Ulm , Germany
| | - Sven Rau
- Ulm University , Institute of Inorganic Chemistry I , Albert-Einstein-Allee 11 , 89081 Ulm , Germany
| |
Collapse
|
3
|
Keane PM, Kelly JM. Transient absorption and time-resolved vibrational studies of photophysical and photochemical processes in DNA-intercalating polypyridyl metal complexes or cationic porphyrins. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.02.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
4
|
|
5
|
Lorenz R, Kaifer E, Wadepohl H, Himmel HJ. Di- and tetranuclear transition metal complexes of a tetrakisguanidino-substituted phenazine dye by stepwise coordination. Dalton Trans 2018; 47:11016-11029. [DOI: 10.1039/c8dt02176g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Coordination of a tetrakisguanidino-substituted phenazine dye in two steps provides rational access to tetranuclear homo- and heterobimetallic complexes.
Collapse
Affiliation(s)
- Roxana Lorenz
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| |
Collapse
|
6
|
González I, Natali M, Cabrera AR, Loeb B, Maze J, Dreyse P. Substituent influence in phenanthroline-derived ancillary ligands on the excited state nature of novel cationic Ir(iii) complexes. NEW J CHEM 2018. [DOI: 10.1039/c8nj00334c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Influence of ancillary ligands derived from phenanthroline on the nature of the deactivation pathways of novel cationic Ir(iii) cyclometalated complexes.
Collapse
Affiliation(s)
- Iván González
- Instituto de Investigación e Innovación en Salud
- Facultad de Ciencias de la Salud
- Universidad Central de Chile. Lord Cochrane 418
- Santiago
- Chile
| | - Mirco Natali
- Department of Chemical and Pharmaceutical Sciences
- University of Ferrara
- and Centro Interuniversitario per la Conversione dell’Energia Solare (SOLARCHEM)
- sez. di Ferrara
- 44121 Ferrara
| | - Alan R. Cabrera
- Departamento de Química Inorgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile. Vicuña Mackenna 4860
- Santiago
- Chile
| | - Bárbara Loeb
- Departamento de Química Inorgánica
- Facultad de Química
- Pontificia Universidad Católica de Chile. Vicuña Mackenna 4860
- Santiago
- Chile
| | - Jerónimo Maze
- Facultad de Física, Pontificia Universidad Católica de Chile. Vicuña Mackenna 4860
- Santiago
- Chile
| | - Paulina Dreyse
- Departamento de Química, Universidad Técnica Federico Santa María. Avenida España 1680
- Valparaíso
- Chile
| |
Collapse
|
7
|
Probing the use of long lived intra-ligand π–π* excited states for photocatalytic systems: A study of the photophysics and photochemistry of [ReCl(CO)3(dppz-(CH3)2)]. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.11.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
8
|
Shillito GE, Larsen CB, McLay JRW, Lucas NT, Gordon KC. Effect of Bridge Alteration on Ground- and Excited-State Properties of Ruthenium(II) Complexes with Electron-Donor-Substituted Dipyrido[3,2-a:2',3'-c]phenazine Ligands. Inorg Chem 2016; 55:11170-11184. [PMID: 27723325 DOI: 10.1021/acs.inorgchem.6b01810] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of Ru(II) 2,2'-bipyridine (bpy) complexes with an electron-accepting dipyrido[3,2-a:2',3'-c]phenazine (dppz) ligand coupled to an electron-donating triarylamine (TAA) group have been investigated. Systematic alteration of a bridging unit between the dppz and TAA allowed exploration into how communication between the donor and acceptor is perturbed by distance, as well as by steric and electronic effects. The effect of the bridging group on the electronic properties of the systems was characterized using a variety of spectroscopic methods, including Fourier transform-Raman (FT-Raman) spectroscopy, resonance Raman spectroscopy, and transient resonance Raman (TR2) spectroscopy. These methods were used in conjunction with ground- and excited-state absorption spectroscopy, electrochemical studies, and DFT calculations. The ground-state electronic absorption spectra show distinct variation with the bridging group, with the wavelength observed for the lowest energy electronic transition ranging from 449 nm to 522 nm, accompanied by large changes in the molar absorptivity. The lowest-energy Franck-Condon state was determined to be intra-ligand charge transfer (ILCT) in nature for most compounds. The presence of higher-energy metal-to-ligand charge transfer (MLCT) Ru(II) → bpy and Ru(II) → dppz transitions was also confirmed via resonance Raman spectroscopy. The TR2 spectra showed characteristic dppz• - and TAA• + vibrations, indicating that the THEXI state formed was also ILCT in nature. Excited-state lifetime measurements reveal that the rate of decay is in accordance with the energy gap law and is not otherwise affected by the nature of the bridging unit.
Collapse
Affiliation(s)
- Georgina E Shillito
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - Christopher B Larsen
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - James R W McLay
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - Nigel T Lucas
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| | - Keith C Gordon
- Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand
| |
Collapse
|
9
|
Horvath R, Huff GS, Gordon KC, George MW. Probing the excited state nature of coordination complexes with blended organic and inorganic chromophores using vibrational spectroscopy. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.04.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
10
|
Barnsley JE, Shillito GE, Larsen CB, van der Salm H, Wang LE, Lucas NT, Gordon KC. Benzo[c][1,2,5]thiadiazole Donor–Acceptor Dyes: A Synthetic, Spectroscopic, and Computational Study. J Phys Chem A 2016; 120:1853-66. [DOI: 10.1021/acs.jpca.6b00447] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
| | | | | | - Holly van der Salm
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| | - Lei E. Wang
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| | - Nigel T. Lucas
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| | - Keith C. Gordon
- Department of Chemistry, University of Otago,
P.O. Box 56, Dunedin, New Zealand
| |
Collapse
|
11
|
Ramos LD, Sampaio RN, de Assis FF, de Oliveira KT, Homem-de-Mello P, Patrocinio AOT, Frin KPM. Contrasting photophysical properties of rhenium(i) tricarbonyl complexes having carbazole groups attached to the polypyridine ligand. Dalton Trans 2016; 45:11688-98. [DOI: 10.1039/c6dt01112h] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fac-[Re(CO)3(cbz2phen)(L)]0/+1 complexes showed a remarkable presence of the ILCTcbz2phen fluorescence in addition to the usually observed 3MLCTRe→cbz2phen. In PMMA films the emission is completely turned into a triplet excited state manifold.
Collapse
Affiliation(s)
- L. D. Ramos
- Universidade Federal do ABC - UFABC
- Santo Andre
- 09210-170 Brazil
| | - R. N. Sampaio
- Universidade Federal de Uberlândia – UFU
- Uberlândia
- 38400-902 Brazil
| | - F. F. de Assis
- Universidade Federal de São Carlos – UFSCar
- São Carlos
- 13565-905 Brazil
| | - K. T. de Oliveira
- Universidade Federal de São Carlos – UFSCar
- São Carlos
- 13565-905 Brazil
| | | | | | - K. P. M. Frin
- Universidade Federal do ABC - UFABC
- Santo Andre
- 09210-170 Brazil
| |
Collapse
|
12
|
Effects of protonation on the optical and photophysical properties of ReCl(CO)3(dppz–TAA) and [Ru(bpy)2(dppz–TAA)]2+. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.01.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
13
|
van der Salm H, Elliott AB, Gordon KC. Substituent effects on the electronic properties of complexes with dipyridophenazine and triazole ligands: Electronically connected and disconnected ligands. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.05.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
14
|
Meyer-Ilse J, Bauroth S, Bräutigam M, Schmitt M, Popp J, Beckert R, Rockstroh N, Pilz TD, Monczak K, Heinemann FW, Rau S, Dietzek B. Modified bibenzimidazole ligands as spectator ligands in photoactive molecular functional Ru-polypyridine units? Implications from spectroscopy. Dalton Trans 2014; 43:17659-65. [DOI: 10.1039/c4dt01399a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
15
|
van der Salm H, Fraser MG, Horvath R, Cameron SA, Barnsley JE, Sun XZ, George MW, Gordon KC. Re(I) Complexes of Substituted dppz: A Computational and Spectroscopic Study. Inorg Chem 2014; 53:3126-40. [DOI: 10.1021/ic403056g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Holly van der Salm
- Department
of Chemistry, University of Otago, Union Place, 9016 Dunedin, New Zealand
| | - Michael G. Fraser
- Department
of Chemistry, University of Otago, Union Place, 9016 Dunedin, New Zealand
| | - Raphael Horvath
- School
of Chemistry, University of Nottingham, Nottingham NG7 2NR, United Kingdom
| | - Scott A. Cameron
- Department
of Chemistry, University of Otago, Union Place, 9016 Dunedin, New Zealand
| | - Jonathan E. Barnsley
- Department
of Chemistry, University of Otago, Union Place, 9016 Dunedin, New Zealand
| | - Xue-Zhong Sun
- School
of Chemistry, University of Nottingham, Nottingham NG7 2NR, United Kingdom
| | - Michael W. George
- School
of Chemistry, University of Nottingham, Nottingham NG7 2NR, United Kingdom
| | | |
Collapse
|
16
|
Larsen CB, van der Salm H, Clark CA, Elliott ABS, Fraser MG, Horvath R, Lucas NT, Sun XZ, George MW, Gordon KC. Intraligand Charge-Transfer Excited States in Re(I) Complexes with Donor-Substituted Dipyridophenazine Ligands. Inorg Chem 2014; 53:1339-54. [DOI: 10.1021/ic402082m] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Christopher B. Larsen
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Holly van der Salm
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Charlotte A. Clark
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Anastasia B. S. Elliott
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Michael G. Fraser
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Raphael Horvath
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Nigel T. Lucas
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| | - Xue-Zhong Sun
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Michael W. George
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Keith C. Gordon
- MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Chemistry, University of Otago, Union Place, Dunedin 9001, New Zealand
| |
Collapse
|
17
|
Sousa SF, Sampaio RN, Barbosa Neto NM, Machado AEH, Patrocinio AOT. The photophysics of fac-[Re(CO)3(NN)(bpa)]+ complexes: a theoretical/experimental study. Photochem Photobiol Sci 2014; 13:1213-24. [DOI: 10.1039/c4pp00074a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of the polypyridyl ligand on the photophysics of Re(i) tricarbonyl complexes was investigated by steady-state and time resolved spectroscopy as well as by theoretical calculations.
Collapse
Affiliation(s)
- S. F. Sousa
- Laboratory of Photochemistry and Materials Science
- Instituto de Química – Universidade Federal de Uberlandia
- Uberlandia, Brazil
| | - R. N. Sampaio
- Instituto de Física – Universidade Federal de Uberlandia
- Uberlandia, Brazil
| | - N. M. Barbosa Neto
- Instituto de Física – Universidade Federal de Uberlandia
- Uberlandia, Brazil
| | - A. E. H. Machado
- Laboratory of Photochemistry and Materials Science
- Instituto de Química – Universidade Federal de Uberlandia
- Uberlandia, Brazil
| | - A. O. T. Patrocinio
- Laboratory of Photochemistry and Materials Science
- Instituto de Química – Universidade Federal de Uberlandia
- Uberlandia, Brazil
| |
Collapse
|
18
|
van der Salm H, Larsen CB, McLay JRW, Fraser MG, Lucas NT, Gordon KC. Stretching the phenazine MO in dppz: the effect of phenyl and phenyl–ethynyl groups on the photophysics of Re(i) dppz complexes. Dalton Trans 2014; 43:17775-85. [DOI: 10.1039/c4dt01415d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dppz complexes with extended conjugation show π,π* and MLCT excited states in solution. Raman spectral features for the short-lived π,π* state are observed in single-colour transient experiments.
Collapse
Affiliation(s)
- Holly van der Salm
- Department of Chemistry
- University of Otago
- 9016 Dunedin, New Zealand
- MacDiarmid Institute for Advanced Materials
- New Zealand
| | - Christopher B. Larsen
- Department of Chemistry
- University of Otago
- 9016 Dunedin, New Zealand
- MacDiarmid Institute for Advanced Materials
- New Zealand
| | | | | | - Nigel T. Lucas
- Department of Chemistry
- University of Otago
- 9016 Dunedin, New Zealand
- MacDiarmid Institute for Advanced Materials
- New Zealand
| | - Keith C. Gordon
- Department of Chemistry
- University of Otago
- 9016 Dunedin, New Zealand
- MacDiarmid Institute for Advanced Materials
- New Zealand
| |
Collapse
|
19
|
Fraser MG, van der Salm H, Cameron SA, Blackman AG, Gordon KC. Heteroleptic Cu(I) bis-diimine complexes of 6,6'-dimesityl-2,2'-bipyridine: a structural, theoretical and spectroscopic study. Inorg Chem 2013; 52:2980-92. [PMID: 23458499 DOI: 10.1021/ic302393p] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A series of heteroleptic Cu(I) complexes containing 6,6'-dimesityl-2,2'-bipyridine and phenanthroline-, bipyridine-, and biquinoline-based ligands is studied. The HETPHEN strategy is utilized to synthesize the heteroleptic complexes, which are stable in solution. The X-ray crystal structures of the complexes are presented; the solid-state four-coordinate Cu(I) geometries are quantified by using the τ4 parameter. A feature of the crystal structures is the intramolecular π-stacking between the mesityl ring(s) and the diimine ligand; the phen-based complexes exhibit stacking between the phen ligand and one of the mesityl rings, creating a "Pac-Man" motif. On the other hand, the bpy-based complexes show different types of packing interaction, with both mesityl rings "clamping down" on the bpy based ligand to give π-stacking. Cyclic voltammetry is used to examine the redox chemistry of the complexes. The most positive potentials for the oxidation process are observed for the complexes with bulky substituents ortho to the coordination nitrogens atoms, i.e., 2,9-dimethyl-1,10-phenanthroline and 6,6'-dibromo-2,2'-bipyridine. The Cu(I) MLCT transitions of the complexes are investigated by resonance Raman spectroscopy in concert with TD-DFT calculations. The resonance Raman spectra of complexes containing substituted biquinolines are straightforward, in that vibrational bands of the biquinoline-based ligand are selectively enhanced over bpy(Mes)2 bands. This is consistent with the purple color of the complexes, due to the lower energy of the biquinoline-based LUMO compared to the bpy(Mes)2 LUMO. All the phen- and bpy-based complexes show enhancement of bpy(Mes)2 bands.
Collapse
Affiliation(s)
- Michael G Fraser
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, Dunedin, New Zealand
| | | | | | | | | |
Collapse
|
20
|
Structural, electronic and computational studies of heteroleptic Cu(I) complexes of 6,6′-dimesityl-2,2′-bipyridine with sulfur-substituted dipyridophenazine ligands. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.08.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
21
|
Rhenium(I) complexes of readily functionalized bidentate pyridyl-1,2,3-triazole “click” ligands: A systematic synthetic, spectroscopic and computational study. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.05.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
22
|
Anderson CB, Elliott ABS, McAdam CJ, Gordon KC, Crowley JD. fac-Re(CO)3Cl Complexes of [2-(4-R-1H-1,2,3-Triazol-1-yl)methyl]pyridine Inverse “Click” Ligands: A Systematic Synthetic, Spectroscopic, and Computational Study. Organometallics 2013. [DOI: 10.1021/om300868k] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Christopher B. Anderson
- Department of Chemistry and ‡MacDiarmid
Institute for Advanced
Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin, New Zealand
| | - Anastasia B. S. Elliott
- Department of Chemistry and ‡MacDiarmid
Institute for Advanced
Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin, New Zealand
| | - C. John McAdam
- Department of Chemistry and ‡MacDiarmid
Institute for Advanced
Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin, New Zealand
| | - Keith C. Gordon
- Department of Chemistry and ‡MacDiarmid
Institute for Advanced
Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin, New Zealand
| | - James D. Crowley
- Department of Chemistry and ‡MacDiarmid
Institute for Advanced
Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin, New Zealand
| |
Collapse
|
23
|
Wächtler M, Bräutigam M, Popp J, Dietzek B. Mechanism of protonation induced changes in Raman spectra of a trisheteroleptic ruthenium complex revealed by DFT calculations. RSC Adv 2013. [DOI: 10.1039/c3ra00157a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
|
24
|
Wächtler M, Guthmuller J, González L, Dietzek B. Analysis and characterization of coordination compounds by resonance Raman spectroscopy. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.02.004] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
25
|
Synthesis, characterization and theoretical studies of ruthenium(II) complexes with the quinone functionalized polypyridine ligand, Nqphen. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.03.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
26
|
Elliott ABS, Horvath R, Gordon KC. Vibrational spectroscopy as a probe of molecule-based devices. Chem Soc Rev 2012; 41:1929-46. [DOI: 10.1039/c1cs15208d] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|