1
|
Santria A, Ishikawa N. Identification of a Weak Interaction between the Spin-Only 4f-Electronic System of Trivalent Gd Ion and a Photoexcited Cyclic π Electronic System. J Phys Chem A 2024; 128:6722-6728. [PMID: 39106396 DOI: 10.1021/acs.jpca.4c04593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2024]
Abstract
An electronic interaction between the spin-only 4f-electronic system and the photoexcited π cyclic system has been identified in the anionic bis(phthalocyaninato)gadolinium(III) complex [Pc2Gd]- by using variable-temperature variable-magnetic-field magnetic circular dichroism (VTVH MCD). Two positive MCD A-term patterns, corresponding to the QH and QL absorption bands, were observed to increase in intensity as the temperature decreased, indicating a ferromagnetic-type interaction between spin angular momentum S of the 4f system and orbital angular momentum L of the photoexcited π system. A theoretical model incorporating the S-L interaction constant CSL was fitted to the VTVH MCD spectra, confirming the presence of a weak interaction, whose intensity was determined as CSL = 0.27 cm-1 for QL and CSL = 0.02 cm-1 for QH. Ab initio calculations using the RASSCF and RASSI methods revealed that the inclusion of the excited state calculations with the spin multiplicity (2S + 1) of 6 was crucial for assigning ΔSL and CSL values. This underscores the essential role of the 6PJ term in accurately modeling the S-L interaction in [Pc2Gd]-.
Collapse
Affiliation(s)
- Anas Santria
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
- Research Center for Chemistry, National Research and Innovation Agency (BRIN), Kawasan PUSPITEK, Serpong, Tangerang Selatan, Banten 15314, Indonesia
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| |
Collapse
|
2
|
Suzuki S, Kaneta A, Santria A, Yoshida K, Oyama T, Imai Y, Akao KI, Ishikawa N. Construction of high-throughput magnetic circular dichroism measurement system and its application to research on magnetic and optical properties of phthalocyanine complexes. Chirality 2024; 36:e23648. [PMID: 38384149 DOI: 10.1002/chir.23648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 12/28/2023] [Accepted: 01/11/2024] [Indexed: 02/23/2024]
Abstract
Magnetic circular dichroism (MCD) spectroscopy is a powerful method for evaluating the electronic structure and magnetic and optical properties of molecules. In particular, MCD measurements have been performed on phthalocyanines and porphyrins with various central metal ions, axial ligands, and substituents to elucidate their properties. It is essential to develop a robust high-throughput technique to perform these measurements comprehensively and efficiently. However, MCD spectroscopy requires very high optical quality for each component of the instrument, and even slight cell distortions can impair the baseline flatness. Consequently, when versatility and data quality are important, an optical system designed for a microplate reader is not suitable for the MCD spectrometer. Therefore, in this study, we develop a new magnetic flow-through cell and combine it with an existing CD spectrometer and autosampler to construct a high-throughput system. The effectiveness and performance of this new system are then evaluated. In addition, based on the MCD and absorption spectra of various phthalocyanine complexes, the effects of substituents and solvents on their magnetic and optical properties and the causes of these effects are discussed. The results demonstrate that this system is effective for the evaluation of the physicochemical properties of various phthalocyanine complexes.
Collapse
Affiliation(s)
- Satoko Suzuki
- Department of Chemistry, Graduate School of Science, Osaka University, Osaka, Japan
- JASCO Corporation, Tokyo, Japan
| | | | - Anas Santria
- Department of Chemistry, Graduate School of Science, Osaka University, Osaka, Japan
- Research Center for Chemistry, National Research and Innovation Agency (BRIN), South Tangerang, Indonesia
| | | | | | - Yoshitane Imai
- Faculty of Science and Engineering, Kindai University, Osaka, Japan
| | | | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, Osaka, Japan
| |
Collapse
|
3
|
Adi LC, Santria A, Ishikawa N. Tuning of the antiferromagnetic-type interaction in photo-excited single-decker porphyrin-lanthanide complexes with different crown capping ligands. Dalton Trans 2024; 53:628-639. [PMID: 38073480 DOI: 10.1039/d3dt02842a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
The magnetic interaction between the total angular momentum (J) of the 4f electrons in a lanthanide ion and the orbital angular momentum (L) of a porphyrin in the photo-excited states of 5,10,15,20-tetraphenylporphyrinato Dy(III) complexes capped with a crown ether with one of two different symmetries, 12-crown-4 or 1-aza-12-crown-4, was investigated by temperature- and magnetic dependent magnetic circular dichroism (VT-VH MCD). The analysis was conducted on the complexes with different non-aromatic ligands to investigate how different symmetries of the non-aromatic ligands have an impact on the electronic interaction causing an anti-parallel orientation of J and L. The magnitude of the J-L interaction was determined from simulation-based fitting to experimental ratios. While in both cases an antiferromagnetic-type interaction between J and L was identified, an asymmetric non-aromatic ligand resulted in an increased magnitude of the J-L interaction.
Collapse
Affiliation(s)
- Langit Cahya Adi
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
| | - Anas Santria
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
- Research Center for Chemistry, National Research and Innovation Agency, Kawasan PUSPITEK, Serpong, Tangerang Selatan, Banten, 15314, Indonesia
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
| |
Collapse
|
4
|
Adi LC, Santria A, Ishikawa N. Magnetic interaction of photoexcited terbium-porphyrin complexes with non-aromatic ligands having different symmetries. Dalton Trans 2022; 51:6186-6196. [PMID: 35383819 DOI: 10.1039/d2dt00306f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interaction between the total angular momentum (J) of 4f electrons in lanthanides and the orbital angular momentum (L) of porphyrins in the photoexcited states was investigated by temperature-dependent and magnetic circular dichroism (MCD) for 5,10,15,20-tetraphenylporphyrinato (TPP) terbium(III) complexes with two different non-aromatic ligands i.e. 12-crown-4(1,4,7,10-tetraoxacyclododecane) and 1-aza-12-crown-4(1,4,7-trioxa-10-azacyclododecane). The two cases with different ligands were examined in order to understand how magnetic interaction depends on the symmetry of the non-aromatic ligands. The three absorption bands in the visible region, B(0,0), Q(1,0), and Q(0,0) bands, showed temperature-dependent MCD A term. For each band, the J-L interaction was determined from the simulation-based fitting to experimental ratios. An increase in the magnitude of the J-L interaction was observed when the second ligand was the aza-crown with a lower symmetry. Ab initio RASSCF/RASSI calculations were performed to explore the effect of the difference in the second ligand to the ligand centred excited states and the ligand-field-splitting structure on the metal-centred ground multiplet of J = 6.
Collapse
Affiliation(s)
- Langit Cahya Adi
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
| | - Anas Santria
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan. .,National Research and Innovation Agency, Jalan M.H. Thamrin No. 8, Jakarta Pusat, Jakarta 10340, Indonesia
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
| |
Collapse
|
5
|
Martynov AG, Horii Y, Katoh K, Bian Y, Jiang J, Yamashita M, Gorbunova YG. Rare-earth based tetrapyrrolic sandwiches: chemistry, materials and applications. Chem Soc Rev 2022; 51:9262-9339. [DOI: 10.1039/d2cs00559j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review summarises advances in chemistry of tetrapyrrole sandwiches with rare earth elements and highlights the current state of their use in single-molecule magnetism, organic field-effect transistors, conducting materials and nonlinear optics.
Collapse
Affiliation(s)
- Alexander G. Martynov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Leninskiy pr., 31, bldg.4, Moscow, Russia
| | - Yoji Horii
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan
| | - Yongzhong Bian
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
- Daxing Research Institute, and Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China
| | - Jianzhuang Jiang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
- Daxing Research Institute, and Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Yulia G. Gorbunova
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Leninskiy pr., 31, bldg.4, Moscow, Russia
- N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Leninskiy pr., 31, Moscow, Russia
| |
Collapse
|
6
|
Mazzoni M, Toledo JR, Pereira-Andrade E, Krambrock K, Cury LA, Malachias Â, Sáfar GDAM. The special case of the spectral emission of a Tb3+ mono metal complex. Chemphyschem 2021; 23:e202100752. [PMID: 34931746 DOI: 10.1002/cphc.202100752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 12/06/2021] [Indexed: 11/08/2022]
Abstract
The fine structure in the spectral lines of the visible fluorescence of Tb 3+ complexes are replaced by a single peak in the case of a singular molecular complex Tb(H 3 PTC) 3 , where H 4 PTC represents perylene-3,4,9,10-tetracarboxylic acid, and its emission wavelength depends on the film thickness. This single peak challenges the old creed that the f-orbital electrons of Tb 3+ are always protected from the influence of the surrounding atoms. We perform density functional theory calculations to show that the wavefunction of the ground state is localized and in addition, spin-polarized, and this facilitates fluorescent transitions under UV to the first excited state instead of the fundamental state. We discuss the possibility of making a spintronic device with the molecule, Tb(H 3 PTC) 3 .
Collapse
Affiliation(s)
- Mário Mazzoni
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - J R Toledo
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo HOrizonte, BRAZIL
| | - Everton Pereira-Andrade
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - Klaus Krambrock
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - Luiz A Cury
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - Ângelo Malachias
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | | |
Collapse
|
7
|
Santria A, Ishikawa N. Antiparallel Coupling between a 4f System and a Photoexcited Cyclic π System in a Dysprosium(III) Monoporphyrinato Complex. Inorg Chem 2021; 60:14418-14425. [PMID: 34503332 DOI: 10.1021/acs.inorgchem.1c02199] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Magnetic coupling resulted by an orbital angular momentum L of a photoexcited cyclic π-conjugated system and total angular momentum J of a localized 4f electronic system in [Dy(TPP)(cyclen)]Cl (TPP = 5,10,15,20-tetraphenylporphyrinato; cyclen = 1,4,7,10-tetraazacyclododecane) has been identified using magnetic circular dichroism (MCD). The MCD A-term patterns of the compound show a negative increment in the intensity by decreasing temperature and nonproportionality to the magnetic field. This phenomenon is experimentally observed for the first time in porphyrin-based lanthanide complexes and indicates the presence of the J-L interaction, with the preferred orientation being antiparallel. A theoretical model in which J and L are assumed to couple antiferromagnetically yielded a quantitative agreement to the experimental data of varied-temperature and varied-magnetic-field MCD spectral measurements. The ab initio calculations were performed, revealing the relationship between two orbital angular momenta, i.e., L(π) and L(f), which result from the delocalized π system and the localized 4f system, respectively.
Collapse
Affiliation(s)
- Anas Santria
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| |
Collapse
|
8
|
Kizaki K, Santria A, Ishikawa N. Intramolecular Magnetic Interaction in a Photogenerated Dual Angular Momentum System in a Terbium-Phthalocyaninato 1:1 Complex. Inorg Chem 2021; 60:2037-2044. [PMID: 33448844 DOI: 10.1021/acs.inorgchem.0c03524] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intramolecular magnetic interaction between a localized open-shell 4f-electronic system and a photoexcited macrocyclic π-conjugate system in terbium-phthalocyaninnato (Tb-Pc) 1:1 complex was investigated using variable-temperature variable-field magnetic circular dichroism (VTVH MCD) spectroscopy. The 1:1 complex [Tb(Pc)(cyclen)]Cl (Pc2- = phthalocyaninato dianion, cyclen = 1,4,7,10-tetraazacyclododecane) with the capping ligand providing an exact fourfold symmetry showed a significant temperature dependence and a nonlinear field dependence in the MCD intensity of the Pc-centered highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) π-π* transition, while a diamagnetic congener [Y(Pc)(cyclen)]Cl showed a temperature-independent MCD with a linear-field dependence. This indicates that the (4f)8 system of the Tb ion with a total angular momentum J and the photoexcited π-system of the Pc macrocycle with an orbital angular momentum L are magnetically coupled. By numerical simulation using a model where ground doublet state |Jz⟩ = |±6⟩ and excited quartet state |Jz, Lz⟩ = |±6, ±|Lz|⟩ are included, the J-L interaction magnitude ΔJL and the Pc-centered orbital angular momentum |Lz|ℏ were determined to be 1.1 cm-1 and 2.0 ℏ, respectively. From ab initio restricted active space self-consistent field (RASSCF)-restricted active space state interaction (RASSI) calculations on the π-π* excited states of the Tb complex, the magnitude of the J-L interaction was estimated. The comparison between the calculations on the Y and Tb complexes revealed that the ferromagnetic-type coupling occurs between the orbital component in the J of Tb and the L on Pc, supporting the model that we employed for the analysis of the experimental data.
Collapse
Affiliation(s)
- Kazuro Kizaki
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyamacho, Toyonaka, Osaka 560-0043, Japan
| | - Anas Santria
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyamacho, Toyonaka, Osaka 560-0043, Japan
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyamacho, Toyonaka, Osaka 560-0043, Japan
| |
Collapse
|