1
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Cheung ASH, Leung MY, Fung THC, Yam VWW. Photoactivable malachite green-based alkynylplatinum(II) 2,6-bis( N-alkylbenzimidazol-2-yl)pyridine complexes. Chem Commun (Camb) 2024. [PMID: 39172031 DOI: 10.1039/d4cc03558e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
Photo-responsive malachite green moieties have been incorporated into an alkynylplatinum(II) bzimpy system. The photo-caged complexes in acetonitrile solutions exhibit self-assembly properties modulable by photo-removal of the cyano protecting group. Distinct aggregate morphologies, which are facilitated by the non-covalent metal-metal and π-π stacking interactions, have been observed before and after photo-irradiation.
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Affiliation(s)
- Andy Shun-Hoi Cheung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
| | - Ming-Yi Leung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
| | - Tony Ho-Ching Fung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
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2
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Tokura Y, Xu S, Yasui K, Nishii Y, Hirano K. Pd-catalysed C-H alkynylation of benzophospholes. Chem Commun (Camb) 2024; 60:2792-2795. [PMID: 38362673 DOI: 10.1039/d3cc05994d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
A palladium-catalysed C2-H alkynylation of benzophospholes with alkynyl bromides has been developed to afford the corresponding phosphole-alkyne conjugations in good to high yields. The C-C triple bond as well as terminal alkyne C-H bond in the obtained products is a good synthetic handle for further manipulations, thus giving the versatile π-conjugated benzophosphole derivatives. The optoelectronic properties of the newly synthesized conjugated benzophospholes are also described.
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Affiliation(s)
- Yu Tokura
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Shibo Xu
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan.
| | - Kosuke Yasui
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yuji Nishii
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Koji Hirano
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan.
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3
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Ishikawa T, Honda A, Miyamura K. Effects of Alkyl Chain Length on the Cold Crystallization of Schiff-Base Nickel(II) Complexes. CrystEngComm 2022. [DOI: 10.1039/d2ce00305h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
"Cold crystallization" is the exothermic phenomenon occurring during the heating process of a supercooled liquid. Molecules that exhibit cold crystallization can be used as heat storage materials. Schiff-base nickel(II) complexes...
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4
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Cheung ASH, Chan MHY, Po C, Hong EYH, Yam VWW. Photo-modulated supramolecular self-assembly of ortho-nitrobenzyl ester-based alkynylplatinum(II) 2,6-bis( N-alkylbenzimidazol-2'-yl)pyridine complexes. Chem Commun (Camb) 2021; 57:13708-13711. [PMID: 34842259 DOI: 10.1039/d1cc05754e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The enhanced supramolecular self-assembly behaviors of photo-caged platinum(II) complexes have been triggered by applying light as the external stimulus. Distinct morphological transformation of the nanoaggregates has been observed in the photo-caged complexes before and after UV irradiation.
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Affiliation(s)
- Andy Shun-Hoi Cheung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
| | - Michael Ho-Yeung Chan
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
| | - Charlotte Po
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
| | - Eugene Yau-Hin Hong
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
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5
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Cheung ASH, Leung SYL, Hau FKW, Yam VWW. Supramolecular Self-assembly of Amphiphilic Alkynylplatinum(II) 2,6-Bis(N-alkylbenzimidazol-2′-yl)pyridine Complexes. Chem Res Chin Univ 2021. [DOI: 10.1007/s40242-021-1309-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Yoshimura A, Misaki Y. Periphery Modification of Tetrathiafulvalenes: Recent Development and Applications. CHEM REC 2021; 21:3520-3531. [PMID: 34086402 DOI: 10.1002/tcr.202100107] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 12/17/2022]
Abstract
Tetrathiafulvalene (TTF) and its analogs are fascinating molecules in materials science based on their excellent electron-donating abilities. This personal account describes recent advances in the synthesis of TTF analogs for functional materials via the palladium-catalyzed modification of peripheries of TTF analogs. We first consider three types of molecules: fluorophore-TTF hybrid molecules, multi-redox systems, and an organic ligand for metal-organic frameworks. These molecules were successfully synthesized via Stille coupling or palladium-catalyzed direct C-H arylation and their structural, electrochemical, and optical properties were clarified. Subsequently, phosphorus-substituted TTF analogs were successfully synthesized for future applications of redox-active phosphine ligands for metal catalysts. The development of these molecules can significantly affect the advancement of chemical science.
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Affiliation(s)
- Aya Yoshimura
- Department of Applied Chemistry, Graduate School of Science and Engineering/ Research Unit for Power Generation and Storage Materials, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577, Japan
| | - Yohji Misaki
- Department of Applied Chemistry, Graduate School of Science and Engineering/ Research Unit for Power Generation and Storage Materials, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577, Japan.,Research Unit for Development of Organic Superconductors, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan
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7
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Zamora A, Wachter E, Vera M, Heidary DK, Rodríguez V, Ortega E, Fernández-Espín V, Janiak C, Glazer EC, Barone G, Ruiz J. Organoplatinum(II) Complexes Self-Assemble and Recognize AT-Rich Duplex DNA Sequences. Inorg Chem 2021; 60:2178-2187. [PMID: 33502194 PMCID: PMC8456496 DOI: 10.1021/acs.inorgchem.0c02648] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
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The
specific recognition of AT-rich DNA sequences opens up the
door to promising diagnostic and/or therapeutic strategies against
gene-related diseases. Here, we demonstrate that amphiphilic PtII complexes of the type [Pt(dmba)(N∧N)]NO3 (dmba = N,N-dimethylbenzylamine-κN, κC; N∧N = dpq (3), dppz (4), and dppn (5)) recognize AT-rich
oligonucleotides over other types of DNA, RNA, and model proteins.
The crystal structure of 4 shows the presence of significant
π-stacking interactions and a distorted coordination sphere
of the d8 PtII atom. Complex 5,
containing the largest π-conjugated ligand, forms supramolecular
assemblies at high concentrations under aqueous environment. However,
its aggregation can be promoted in the presence of DNA at concentrations
as low as 10 μM in a process that “turns on” its
excimer emission around 600 nm. Viscometry, gel electrophoresis, and
theoretical calculations demonstrate that 5 binds to
minor groove when self-assembled, while the monomers of 3 and 4 intercalate into the DNA. The complexes also
inhibit cancer cell growth with low-micromolar IC50 values
in 2D tissue culture and suppress tumor growth in 3D tumor spheroids
with a multicellular resistance (MCR) index comparable to that of
cisplatin. Cyclometalated PtII complexes
containing π-conjugated
ligands form supramolecular assemblies under aqueous environment,
and DNA-induced aggregation occurs for the one containing the highest
conjugated N,N-diimine ligand. The complexes recognize
AT-rich DNA sequences over others in DNA, RNA, and proteins. Their
DNA binding mode switches from intercalation to minor groove binding
when self-assembled. The complexes suppress tumor growth in 3D tumor
spheroids.
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Affiliation(s)
- Ana Zamora
- Departamento de Química Inorgánica, Universidad de Murcia, and Biomedical Research Institute of Murcia (IMIB-Arrixaca), E-30071 Murcia, Spain
| | - Erin Wachter
- Department of Chemistry, University of Kentucky 505 Rose Street, Lexington, Kentucky 40506, United States
| | - María Vera
- Departamento de Química Inorgánica, Universidad de Murcia, and Biomedical Research Institute of Murcia (IMIB-Arrixaca), E-30071 Murcia, Spain
| | - David K Heidary
- Department of Chemistry, University of Kentucky 505 Rose Street, Lexington, Kentucky 40506, United States
| | - Venancio Rodríguez
- Departamento de Química Inorgánica, Universidad de Murcia, and Biomedical Research Institute of Murcia (IMIB-Arrixaca), E-30071 Murcia, Spain
| | - Enrique Ortega
- Departamento de Química Inorgánica, Universidad de Murcia, and Biomedical Research Institute of Murcia (IMIB-Arrixaca), E-30071 Murcia, Spain
| | | | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf, D-40204 Düsseldorf, Germany
| | - Edith C Glazer
- Department of Chemistry, University of Kentucky 505 Rose Street, Lexington, Kentucky 40506, United States
| | - Giampaolo Barone
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), Università di Palermo, 90128 Palermo, Italy
| | - José Ruiz
- Departamento de Química Inorgánica, Universidad de Murcia, and Biomedical Research Institute of Murcia (IMIB-Arrixaca), E-30071 Murcia, Spain
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8
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Liu J, Wang S, Li W, Dong Y, Wang J, Song Q, Zhang C. A novel imidazole-based tri-nitrogen metal cations probe with better-selectivity in ionic radius and acting as a Zn2+ fluorescence turn-on sensor. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128909] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Shingade VM, Grove LJ, Connick WB. Luminescent Pt(2,6-bis(N-methylbenzimidazol-2-yl)pyridine)X +: a comparison with the spectroscopic and electrochemical properties of Pt(tpy)X + (X = Cl, CCPh, Ph, or CH 3). Dalton Trans 2020; 49:9651-9661. [PMID: 32627792 DOI: 10.1039/d0dt01496f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A series of platinum(ii) pincer complexes of the formula Pt(mbzimpy)X+, 1(a-d), (mbzimpy = 2,6-bis(N-methylbenzimidazol-2-yl)pyridine; X = Cl; (a), CCPh; (b), Ph; (c), or CH3; (d), CCPh = phenylacetylide, and Ph = Phenyl) have been synthesized and characterized. Electronic absorption and emission, as well as electrochemical properties of these compounds, have been investigated. Pt(tpy)X+ analogs (tpy = 2,2';6'2''-terpyridine), 2(a-d), have also been investigated and compared. Electrochemistry shows that 1 and 2 analogs undergo two chemically reversible one-electron reduction processes that are shifted cathodically along the a < b < c < d series. Notably, these reductions occur at slightly higher negative potentials in the case of 1. The absorption spectra of 1 and 2 in acetonitrile exhibit ligand-centered (1LC) transitions (ε ≈ 104 M-1 cm-1) in the UV region and metal-to-ligand-charge transfer (1MLCT) transitions (ε ≈ 103 M-1 cm-1) in the visible region. The corresponding visible bands of 1b and 2b have been assigned to 1(LLCT/MLCT) mixed state (LLCT: ligand-to-ligand-charge transfer). The preceding 1LC and 1MLCT transitions of 1 occur at lower energies than that of 2. These 1LC transitions have distinctly been blue-shifted along a < c < d in 2, but occur at nearly identical energies in 1. Conversely, 1MLCT transitions are red-shifted along a < c < d in both the analogs. The 77 K glassy solutions of 1 and 2 exhibit an intense vibronically-structured emission band at λmax(0-0) in the 470-560 nm range. This band is red-shifted along b < a ≤ c < d in 1 and along a ≤ d ≈ c ≪ b in 2. The main character of these emissions is assigned to 3LLCT emissive state in 1b and 2b, whereas to 3LC in the rest of the compounds. Relative stabilization of these spin-forbidden emissive states is discussed by invoking configuration mixing with the higher-lying 3MLCT state.
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Affiliation(s)
- Vikas M Shingade
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, USA.
| | - Levi J Grove
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, USA.
| | - William B Connick
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, USA.
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10
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Wu NMW, Yam VWW. Photochromic Barbiturate Pendant-Containing Benzo[ b]phosphole Oxides with Co-Assembly Property and Photoinduced Morphological Changes. ACS APPLIED MATERIALS & INTERFACES 2019; 11:40290-40299. [PMID: 31633321 DOI: 10.1021/acsami.9b13900] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A series of novel barbiturate pendant-containing benzo[b]phosphole oxides has been demonstrated to exhibit photochromic and co-assembly properties. Both the open form and the photogenerated closed form of the diarylethene-based benzo[b]phosphole oxides have displayed color changes with new appearance of the bathochromic-shifted lowest-energy absorption bands upon addition of the H-bonding ditopic receptor that is complementary to the barbiturate groups, probably resulting in the formation of a supramolecular polymer. The co-assembly mixtures have displayed dissociation and association processes upon heating and cooling, respectively. Moreover, both the unassembled and co-assembled states of the benzo[b]phosphole oxide have exhibited photoinduced coloration, leading to a near-infrared absorption behavior. Multiaddressable states of the co-assembly mixture with multiple colors have been achieved via the combination of photochromism and thermochromism. More interestingly, photoinduced morphological changes from extensive porous network structures to ring-like aggregates have been observed for the co-assembly upon photoirradiation. The present work provides important insight for further developments of the multiaddressable systems and the supramolecular polymers with photo- and thermo-responsive behaviors, paving the way for the future design of photochromic materials with interesting photocontrollable functions.
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Affiliation(s)
- Nathan Man-Wai Wu
- Institute of Molecular Functional Materials [Areas of Excellence Scheme, University Grant Committee (Hong Kong)] and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials [Areas of Excellence Scheme, University Grant Committee (Hong Kong)] and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
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11
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Wu NM, Ng M, Yam VW. Photochromic Benzo[
b
]phosphole Alkynylgold(I) Complexes with Mechanochromic Property to Serve as Multistimuli‐Responsive Materials. Angew Chem Int Ed Engl 2019; 58:3027-3031. [DOI: 10.1002/anie.201806272] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 06/30/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Nathan Man‐Wai Wu
- Institute of Molecular Functional Materials, Areas of Excellence Scheme, University Grants Committee (Hong Kong) andDepartment of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Maggie Ng
- Institute of Molecular Functional Materials, Areas of Excellence Scheme, University Grants Committee (Hong Kong) andDepartment of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Vivian Wing‐Wah Yam
- Institute of Molecular Functional Materials, Areas of Excellence Scheme, University Grants Committee (Hong Kong) andDepartment of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
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12
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Photochromic Benzo[
b
]phosphole Alkynylgold(I) Complexes with Mechanochromic Property to Serve as Multistimuli‐Responsive Materials. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806272] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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