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Palominos F, Mella P, Guajardo K, Günther G, Vega A, Pizarro N. Photoinduced behaviour of N,N-bidentate manganese(I) and rhenium(I) tricarbonyl complexes for singlet oxygen generation and CO release. Photochem Photobiol Sci 2024; 23:119-132. [PMID: 38082202 DOI: 10.1007/s43630-023-00507-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 11/07/2023] [Indexed: 02/02/2024]
Abstract
The combined action of singlet oxygen (1O2) and photoinduced carbon monoxide (CO) released by tricarbonyl metal complexes is a promising synergic treatment against multi-resistant bacterial infections. In this work, we explore the use of a polydentate ligand (bpm = 2,2-bipyrimidine) that offers the opportunity to accommodate two metal centers exhibiting both singlet oxygen generation and carbon monoxide releasing properties in a single molecule. A series of monometallic ([(bpm)M(CO)3Br]; M = Mn, Re) and homo or hetero bimetallic ([Br(CO)3M(bpm)M'(CO)3Br]; M = Mn, Re) compounds were synthesized in moderate to good yields by modulating the metal precursor or the stoichiometry, also the syn:anti isomers ratio for the bimetallic complexes was dependent on the experimental conditions used. DFT modelling shows the anti-isomer is more stable than the syn-isomer by less than 8 kJ mol-1, which is consistent with those experimentally observed in terms of majority product and the effect of experimental conditions over the anti-syn ratio. The HOMO-LUMO gap is lower for the mono and bimetallic rhenium(I) compounds compared to the values for the manganese(I) analogues, while the heterometallic complex shows intermediate values for the anti-isomer. The photophysical characterization shows typical absorption and emission bands with MLCT character. In addition, CO-release and 1O2 generation quantum yields were evaluated for the monometallic Mnbpm and Rebpm homologues and compared with values obtained for the homo- and hetero-bimetallic complexes. Interestingly the replacement of a Mn(CO)3Br moiety in MnbpmMn by a Re(CO)3Br one makes the heterometallic MnbpmRe molecule a molecular oxygen sensitizer and partially retaining its carbon monoxide releasing ability.
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Affiliation(s)
- Franco Palominos
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Viña del Mar, Chile
- Programa de Doctorado en Fisicoquímica Molecular, Universidad Andrés Bello, Santiago, Chile
| | - Pablo Mella
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Viña del Mar, Chile
| | - Kevin Guajardo
- Facultad de Ciencias de la Vida, Carrera de Ingeniería en Biotecnología, Universidad Andres Bello, Viña del Mar, Chile
| | - Germán Günther
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Andrés Vega
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Viña del Mar, Chile
- Centro para el Desarrollo de la Nanociencia y la Nanotecnología, CEDENNA, Santiago, Chile
| | - Nancy Pizarro
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Viña del Mar, Chile.
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Phukon U, Kedia M, Shankar B, Sathiyendiran M. Rhenium-Pyrazolyl-Based Figure-Eight- and Z-Shaped Metallocycles: Self-Assembly, Solid-State Structures, Dynamic Properties in Solution, and Competitive Ligand-Induced Supramolecular Transformations into Rhenium-Pyridyl/-Benzimidazolyl/-Phosphine-Based Metallocycles/Acyclic Complexes. ACS OMEGA 2023; 8:41773-41784. [PMID: 37969972 PMCID: PMC10633831 DOI: 10.1021/acsomega.3c06371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 09/23/2023] [Accepted: 10/10/2023] [Indexed: 11/17/2023]
Abstract
Rhenium(I)tricarbonyl core-based heteroleptic "figure-eight"- and Z-shaped metallocycles (1a-4a) of the general formula fac-[{(CO)3Re(μ-L)Re(CO)3}2(dppz)2] were self-assembled from Re2(CO)10, H2-L (H2-L = 5,8-dihydroxy-1,4-naphthaquinone (H2-dhnq) for 1a; 1,4-dihydroxy-9,10-anthraquinone (H2-dhaq) for 2a; 6,11-dihydroxy-5,12-naphthacenedione (H2-dhnd) for 3a; 2,2'-bisbenzimidazole (H2-bbim) for 4a), and bis(4-((pyrazolyl)methyl)phenylmethane) (dppz) via one-pot coordination-driven synthetic approach. The molecular structures of 1a and 4a were unambiguously confirmed by single-crystal X-ray diffraction (SC-XRD) methods. The metallocycles in the DMSO solution exist as an acyclic dinuclear-DMSO adduct of the general formula fac-[{(CO)3Re(μ-L)Re(CO)3}(DMSO)2] (1b, L = dhnq; 2b, L = dhaq; 3b, L = dhnd; 4b, L = bbim) and dppz, which are in dynamic equilibrium. The dynamic behavior of the rhenium-pyrazolyl bond in the solution state was effectively utilized to transform metallocycles 1a-4a into pyridyl/benzimidazolyl/phosphine donor-based heteroleptic metallocycles and acyclic dinuclear complexes (4-13). These include tetranuclear rectangles fac-[{(CO)3Re(μ-L)Re(CO)3}2(4,4'-bpy)2] (4 and 11, L = dhaq for 4 and bbim for 11), dinuclear metallocycles fac-[{(CO)3Re(μ-L)Re(CO)3}(dpbim)] (5-7 and 12; L = dhnq for 5, dhaq for 6, dhnd for 7, and bbim for 12), and dinuclear acyclic complexes fac-[{(CO)3Re(μ-L)Re(CO)3}(PTA)2] (8-10 and 13; L = dhnq for 8, dhaq for 9, dhnd for 10, and bbim for 13). These transformations were achieved through component-induced supramolecular reactions while treating with competitive ligands 4,4'-bipyridine (4,4'-bpy), bis(4-((1H-benzoimidazole-1-yl)methyl)phenyl)methane (dpbim), and 1,3,5-triaza-7-phosphaadamantane (PTA). The reaction mixture in the solution was analyzed using NMR and electrospray ionization mass spectrometry (ESI-MS) analysis. Additionally, crystal structures of 4, 6, and 13, which were obtained in the mixture of the solutions, were determined, providing unequivocal evidence for the occurrence of supramolecular transformation within the system. The results reveal that the size of the chelating ligand and the pyrazolyl donor angle of the ditopic ligand play crucial roles in determining the resulting solid-state metallacyclic architecture in these synthetic combinations. The dynamic behavior of the rhenium-pyrazolyl bond in the metallocycles can be utilized to transform into other metallocycles and acyclic complexes using suitable competing ligands via ligand-induced supramolecular transformations.
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Affiliation(s)
- Upasana Phukon
- School
of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Moon Kedia
- School
of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Bhaskaran Shankar
- Department
of Chemistry, Thiagarajar College of Engineering, Madurai 625 015, India
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Kedia M, Khatun S, Phukon U, Shankar B, Rengan AK, Sathiyendiran M. Trinuclear rhenium(I)-based metallocages as anticancer agents towards human cervical cancer cells. Dalton Trans 2023; 52:14314-14318. [PMID: 37789813 DOI: 10.1039/d3dt02535g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
The first examples of spherical-shaped trinuclear rhenium(I) organometallic cages displaying cytotoxic, antimetastatic, antiproliferative and DNA-damaging behavior towards a human cervical (HeLa) cancer cell line are reported. The compact design of the metallocages facilitates their interactions with biosystems leading to comparable efficiency to that of the commonly used anticancer drug cisplatin.
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Affiliation(s)
- Moon Kedia
- School of Chemistry, University of Hyderabad, Hyderabad-500 046, India.
| | - Sajmina Khatun
- Department of Biomedical Engineering, Indian Institute of Technology, Kandi, Hyderabad-502 284, India.
| | - Upasana Phukon
- School of Chemistry, University of Hyderabad, Hyderabad-500 046, India.
| | - Bhaskaran Shankar
- Department of Chemistry, Thiagarajar College of Engineering, Madurai-625 015, India
| | - Aravind Kumar Rengan
- Department of Biomedical Engineering, Indian Institute of Technology, Kandi, Hyderabad-502 284, India.
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Bhol M, Borkar RL, Shankar B, Panda SK, Wolff M, Sathiyendiran M. Self-Assembly of Rhenium(I) Double-Stranded Helicate and Mesocate from Flexible Ditopic Benzimidazolyl/Naphthanoimidazolyl N-Donor and Rigid Bis-Chelating Hydroxyphenylbenzimidazolyl N∩OH-Donor Ligands: Synthesis, Characterization, and Photophysical and B-DNA Docking Studies. Inorg Chem 2023; 62:11554-11569. [PMID: 37436081 DOI: 10.1021/acs.inorgchem.3c01213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
The self-assembly of three rheniumtricarbonyl core-based supramolecular coordination complexes (SCCs), fac-[Re(CO)3(μ-L)(μ-L')Re(CO)3] (1-3) was carried out using Re2(CO)10, rigid bis-chelating ligand (HO∩N-Ph-N∩OH (L1) (where HO∩N = 2-hydroxyphenylbenzimidazolyl), and flexible ditopic N-donor ligands (L2 = bis(3-((1H-benzoimidazol-1-yl)methyl)-2,4,6-trimethylphenyl)methane, L3 = bis(3-((1H-naphtho[2,3-d]imidazol-1-yl)methyl)-2,4,6-trimethylphenyl)methane, L4 = bis(4-(naphtho[2,3-d]imidazol-1-yl-methyl)phenyl)methane) via a one-pot solvothermal approach. In the solid state, the dinuclear SCCs adopt heteroleptic double-stranded helicate and meso-helicate architectures. The supramolecular structures of the complexes are retained in the solution based on the 1H NMR and electrospray ionization (ESI)-mass analysis. The spectral and photophysical properties of the complexes were studied both experimentally and using time-dependent density functional theory (TDDFT) calculations. All of the supramolecules exhibited emission in both solution and solid states. Theoretical studies were conducted to determine the chemical reactivity parameters, molecular electrostatic potential surface plots, natural population, and Hirshfeld analysis for complexes 1-3. Additionally, molecular docking studies were carried out for complexes 1-3 with B-DNA.
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Affiliation(s)
- Mamina Bhol
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Reema L Borkar
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Bhaskaran Shankar
- Department of Chemistry, Thiagarajar College of Engineering, Madurai 625015, India
| | - Saroj Kumar Panda
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Berhampur 760010, India
| | - Mariusz Wolff
- Institut für Chemische Katalyse, Universität Wien, Währinger Straße 38-42, Wien 1090, Österreich
- Institute of Chemistry, University of Silesia in Katowice, Szkolna 9th Street, Katowice 40-006, Poland
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5
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Divya D, Govindarajan R, Nagarajaprakash R, Fayzullin RR, Vidhyapriya P, Sakthivel N, Manimaran B. Multicomponent Self-Assembly of Diaminobenzoquinonato-Bridged Manganese(I) Metallosupramolecular Rectangles: Host–Guest Interactions, Anticancer Activity, and Visible-Light-Induced CO Releasing Studies. Inorg Chem 2022; 61:15377-15391. [DOI: 10.1021/acs.inorgchem.2c01829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dhanaraj Divya
- Department of Chemistry, Pondicherry University, Puducherry 605014, India
| | | | - Ramamurthy Nagarajaprakash
- Chemical Sciences Research Group, Division of Research & Development, Lovely Professional University, Phagwara 144411, Punjab, India
| | - Robert R. Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russian Federation
| | | | - Natarajan Sakthivel
- Department of Biotechnology, Pondicherry University, Puducherry 605014, India
| | - Bala. Manimaran
- Department of Chemistry, Pondicherry University, Puducherry 605014, India
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6
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Kedia M, Shankar B, Sathiyendiran M. Rhenium(I)-Based Neutral Coordination Cages with a Spherical Cavity for Selective Recognition of Fluoride. Inorg Chem 2022; 61:14506-14510. [PMID: 36067005 DOI: 10.1021/acs.inorgchem.2c02408] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Neutral heteroleptic trinuclear coordination cages containing a preorganized well-defined small spherical endocavity, which is made up of electron-deficient bowl frameworks, three coordination-induced neutral polar C-H donors, and a phenyl motif, were self-assembled via a one-pot approach; the endocavity accommodates fluoride selectively in the presence of other halides.
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Affiliation(s)
- Moon Kedia
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Bhaskaran Shankar
- Department of Chemistry, Thiagarajar College of Engineering, Madurai 625 015, India
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7
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Bhol M, Shankar B, Sathiyendiran M. Rhenium(I)-Based Heteroleptic Pentagonal Toroid-Shaped Metallocavitands: Self-Assembly and Molecular Recognition Studies. Inorg Chem 2022; 61:11497-11508. [PMID: 35820114 DOI: 10.1021/acs.inorgchem.2c02061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A family of neutral, heteroleptic, dinuclear M2LL'-type pentagonal toroid-shaped metallomacrocycles (1-8) were synthesized using flexible ditopic N donors (Ln = L1-L2), rigid bis-chelating ligands (H2-L' = H2-E), and Re2(CO)10 in a one-pot solvothermal self-assembly approach. The ligands and the metallomacrocycles were characterized using ATR-IR, electrospray ionization mass spectrometry, nuclear magnetic resonance, ultraviolet-visible, and emission spectroscopy methods. The molecular structures of 1, 2, 4, 6, and 7 were confirmed by an X-ray diffraction study and are similar to those of calix[5]arene. The cyclic inner cavities of the metallomacrocycles accommodate toluene/mesitylene/acetone/chlorobenzene as guest molecules that are stabilized by cumulative C-H···π and π···π interactions with the cyclic framework of metallomacrocycle. The photophysical properties of the ligands and the metallomacrocycles were studied. The host-guest recognition properties of metallocavitands 1, 2, 7, and 8 as a model host with phenol and nitrobenzene derivatives as guest molecules were studied by emission spectroscopy methods.
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Affiliation(s)
- Mamina Bhol
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Bhaskaran Shankar
- Department of Chemistry, Thiagarajar College of Engineering, Madurai 625015, India
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8
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Pete S, Roy N, Kar B, Paira P. Construction of homo and heteronuclear Ru(II), Ir(III) and Re(I) complexes for target specific cancer therapy. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214462] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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9
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Bhol M, Claude G, Jungfer MR, Abram U, Sathiyendiran M. Calix[4]arene-Analogous Technetium Supramolecules. Inorg Chem 2022; 61:5173-5177. [PMID: 35319206 DOI: 10.1021/acs.inorgchem.1c03691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Calix[4]arene-analogous technetium supramolecules (1 and 2) were assembled using (NBu4)[Tc2(μ-Cl)3(CO)6] and neutral flexible bidentate nitrogen-donor ligands (L1 and L2) consisting of four arene units covalently joined via methylene units. The neutral homoleptic technetium macrocycles adopt a partial cone/cone-shaped conformation in the solid state. These supramolecules are the first example of fac-[Tc(CO)3]+ core-based metallocalix[4]arenes and second example of fac-[Tc(CO)3]+ core-based metallomacrocycles. Structurally similar fac-[Re(CO)3]+ core-based macrocycles (3 and 4) were also prepared using [Re(CO)5X] (where X = Cl or Br) and L1 or L2. The products were characterized spectroscopically and by X-ray analysis.
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Affiliation(s)
- Mamina Bhol
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Guilhem Claude
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34-36, Berlin D-14195, Germany
| | - Maximilian Roca Jungfer
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34-36, Berlin D-14195, Germany
| | - Ulrich Abram
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34-36, Berlin D-14195, Germany
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10
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Kedia M, Priyatharsini M, Sathiyashivan SD, Shankar B, Krishnakumar RV, Sathiyendiran M. Prototype rhenium metallocavitand with four exocyclic cavities for small molecules. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122123] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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11
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Sharma S. A, N. V, Kar B, Das U, Paira P. Target-specific mononuclear and binuclear rhenium( i) tricarbonyl complexes as upcoming anticancer drugs. RSC Adv 2022; 12:20264-20295. [PMID: 35919594 PMCID: PMC9281374 DOI: 10.1039/d2ra03434d] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 06/24/2022] [Indexed: 11/21/2022] Open
Abstract
Metal complexes have gradually been attracting interest from researchers worldwide as potential cancer therapeutics. Driven by the many side effects of the popular platinum-based anticancer drug cisplatin, the tireless endeavours of researchers have afforded strategies for the design of appropriate metal complexes with minimal side effects compared to cisplatin and its congeners to limit the unrestricted propagation of cancer. In this regard, transition metal complexes, especially rhenium-based complexes are being identified and highlighted as promising cancer theranostics, which are endowed with the ability to detect and annihilate cancer cells in the body. This is attributed the amazing photophysical properties of rhenium complexes together with their ability to selectively attack different organelles in cancer cells. Therefore, this review presents the properties of different rhenium-based complexes to highlight their recent advances as anticancer agents based on their cytotoxicity results. In this review, rhenium-based complexes are highlighted as promising cancer theranostics, which are endowed with the ability to detect and annihilate cancer cells in the body.![]()
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Affiliation(s)
- Ajay Sharma S.
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore-632014, Tamil Nadu, India
| | - Vaibhavi N.
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore-632014, Tamil Nadu, India
| | - Binoy Kar
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore-632014, Tamil Nadu, India
| | - Utpal Das
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore-632014, Tamil Nadu, India
| | - Priyankar Paira
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore-632014, Tamil Nadu, India
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12
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Karges J, Seo H, Cohen SM. Synthesis of tetranuclear rhenium(I) tricarbonyl metallacycles. Dalton Trans 2021; 50:16147-16155. [PMID: 34679156 DOI: 10.1039/d1dt02435c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Re(I) tricarbonyl complexes have received much attention due to their attractive photochemical, electrochemical, and biological properties. Beyond simple mononuclear complexes, multinuclear assemblies offer greater structural diversity and properties. Despite previous reports on the preparation of di-, tri-, or tetranuclear Re(I) tricarbonyl assemblies, the synthesis of these supramolecular structures remains challenging due to overall low yields or tedious purification protocols. Herein, the facile preparation and characterization of tetranuclear Re(I) tricarbonyl metallacycles with a square geometry is reported using a tetrazole-based ligand. The synthesis of the metallacycle was optimized using different metal precursors, solvents, temperatures, and reagent concentrations. Finally, the scope of suitable tetrazole-based ligands was explored to produce several tetranuclear Re(I) tricarbonyl-based metallacycles.
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Affiliation(s)
- Johannes Karges
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
| | - Hyeonglim Seo
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
| | - Seth M Cohen
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
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13
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Singh B, Pani B, Gupta D. Multiple phenyl ring appended Re-based complexes for strong visible light absorption and DNA binding. Dalton Trans 2021; 50:15558-15566. [PMID: 34668005 DOI: 10.1039/d1dt02216d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of facial-Re(CO)3-based acyclic complexes (1-3) possessing N∩O bis-chelating ligands and a triphenylphosphine oxide donor was synthesized and characterized. The most interesting structural feature of these complexes is that both the coordinated ligands are functionalized with external phenyl rings. Single crystal X-ray diffraction analysis confirms that each molecule demonstrates a variety of intermolecular supramolecular interactions via the external phenyl rings. All the complexes displayed strong absorption (ε = 14 000-40 000 M-1 cm-1) over wide visible region (400-600 nm). Due to the interesting structural and photophysical properties of the complexes, a satisfactory DNA binding ability was observed. The binding of the complexes with DNA grooves was confirmed by a significant increase in the absorption intensities of the complexes in the visible region, absorption enhancement of DNA and circular dichroism.
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Affiliation(s)
- Bholey Singh
- Department of Chemistry, Bhaskaracharya College of Applied Sciences (University of Delhi), Sector-2, Dwarka, New Delhi, 110075, India.
| | - Balaram Pani
- Department of Chemistry, Bhaskaracharya College of Applied Sciences (University of Delhi), Sector-2, Dwarka, New Delhi, 110075, India.
| | - Deepak Gupta
- Department of Chemistry, Bhaskaracharya College of Applied Sciences (University of Delhi), Sector-2, Dwarka, New Delhi, 110075, India.
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Priyatharsini M, Mishra I, Shankar B, Srinivasan N, Krishnakumar RV, Sathiyendiran M. fac-Re(CO)3 core-based complex featuring benzimidazole as pendant motif from hydroxyquinoline and pyridylbenzimidazole. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.122052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Acosta A, Antipán J, Fernández M, Prado G, Sandoval-Altamirano C, Günther G, Gutiérrez-Urrutia I, Poblete-Castro I, Vega A, Pizarro N. Photochemistry of P,N-bidentate rhenium(i) tricarbonyl complexes: reactive species generation and potential application for antibacterial photodynamic therapy. RSC Adv 2021; 11:31959-31966. [PMID: 35495525 PMCID: PMC9041655 DOI: 10.1039/d1ra06416a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 09/14/2021] [Indexed: 12/22/2022] Open
Abstract
In this work, we describe the photoisomerization of facial rhenium(i) tricarbonyl complexes bearing P,N-bidentate pyridyl/phosphine ligands with different chelating rings and anions: RePNBr, RePNTfO, and RePNNBr, which are triggered under irradiation at 365 nm in solutions. The apparent photodegradation rate constants (k app) depend on the coordinating ability of the solvent, being lowest in acetonitrile. The k app value increases as the temperature rises, suggesting a reactive IL excited state thermally populated from the MLCT excited state involved. Using the Eyring equation, positive activation enthalpies (ΔH ≠) accompanied by high negative values for the activation entropy (ΔS ≠) were obtained. These results suggest whatever the P,N-ligand or anion, the reaction proceeds through a strongly solvated or a compact transition state, which is compatible with an associative mechanism for the photoisomerization. A 100-fold decrease in the log10 CFU value is observed for E. coli and S. aureus in irradiated solutions of the compounds, which follows the same tendency as their singlet oxygen generation quantum yield: RePNBr > RePNTfO > RePNNBr, while no antibacterial activity is observed in the darkness. This result indicates that the generation of singlet oxygen plays a key role in the antibacterial capacity of these complexes.
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Affiliation(s)
- Alison Acosta
- Universidad Técnica Federico Santa María, Centro de Biotecnología Avenida España 1680 Valparaíso Chile
| | - Javier Antipán
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas Viña del Mar Chile
| | - Mariano Fernández
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas Viña del Mar Chile
| | - Gaspar Prado
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas Viña del Mar Chile
| | - Catalina Sandoval-Altamirano
- Universidad de Santiago de Chile (USACH), Facultad de Química y Biología, Departamento de Ciencias del Ambiente Chile
| | - Germán Günther
- Universidad de Chile, Facultad de Ciencias Químicas y Farmacéuticas, Departamento de Química Orgánica y Fisicoquímica Santiago Chile
| | - Izabook Gutiérrez-Urrutia
- Universidad Andrés Bello, Facultad de Ciencias de la Vida, Center for Bioinformatics and Integrative Biology (CBIB), Biosystems Engineering Laboratory Santiago Chile
| | - Ignacio Poblete-Castro
- Universidad Andrés Bello, Facultad de Ciencias de la Vida, Center for Bioinformatics and Integrative Biology (CBIB), Biosystems Engineering Laboratory Santiago Chile
| | - Andrés Vega
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas Viña del Mar Chile
| | - Nancy Pizarro
- Universidad Andres Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas Viña del Mar Chile
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Olumba ME, Na H, Friedman AE, Teets TS. Coordination-Driven Self-Assembly of Cyclometalated Iridium Squares Using Linear Aromatic Diisocyanides. Inorg Chem 2021; 60:5898-5907. [PMID: 33784459 DOI: 10.1021/acs.inorgchem.1c00312] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Here, we demonstrate facile [4 + 4] coordination-driven self-assembly of cyclometalated iridium(III) using linear aryldiisocyanide bridging ligands (BLs). A family of nine new [Ir(C^N)2(μ-BL)]44+ coordination cages is described, where C^N is the cyclometalating ligand-2-phenylpyridine (ppy), 2-phenylbenzothiazole (bt), or 1-phenylisoquinoline (piq)-and BL is the diisocyanide BL, with varying spacer lengths between the isocyanide binding sites. These supramolecular coordination compounds are prepared via a one-pot synthesis, with isolated yields of 40-83%. 1H NMR spectroscopy confirms the selective isolation of a single product, which is affirmed to be the M4L4 square by high-resolution mass spectrometry. Detailed photophysical studies were carried out to reveal the nature of the luminescent triplet states in these complexes. In most cases, phosphorescence arises from the [Ir(C^N)2]+ nodes, with the emission color determined by the cyclometalating ligand. However, in two cases, the lowest-energy triplet state resides on the aromatic core of the BL, and weak phosphorescence from that state is observed. This work shows that aromatic diisocyanide ligands enable coordination-driven assembly of inert iridium(III) nodes under mild conditions, producing supramolecular coordination complexes with desirable photophysical properties.
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Affiliation(s)
- Morris E Olumba
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| | - Hanah Na
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| | - Alan E Friedman
- Department of Materials, Design, and Innovation, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Thomas S Teets
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
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Mishra I, Bhol M, Kalimuthu P, Sathiyendiran M. Emerging Spacers-Based Ligands for Supramolecular Coordination Complexes. CHEM REC 2021; 21:594-614. [PMID: 33615668 DOI: 10.1002/tcr.202000150] [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: 11/11/2020] [Indexed: 02/01/2023]
Abstract
The design and self-assembly of supramolecular coordination complexes (SCCs) i. e., discrete cyclic metalloarchitectures such as cycles, cages, mesocates, and helicates with desired size, shape, and properties have been increasing exponentially owing to their potential applications in molecular sensors, molecular cargos, molecular recognition, and catalysis. The introduction of the organic motifs and metal complexes as a spacer provides functionality to the metalloarchitecture. This review mainly focusses on newly evolving spacer based ligands employed to yield simple to high-order metallosupramolecular assemblies using straight-forward approaches. The new spacers including corannulene, organic cyclic framework, bicyclic organic motifs, aliphatic chain, metalloligands, triarylboron, BODIPY, azaphosphatrane, phosphine, and thio/selenophosphates offer a great set of properties and in-built functionalities to the metalloarchitectures which are discussed in this review.
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Affiliation(s)
- Isha Mishra
- School of Chemistry, University of Hyderabad, Hyderabad, 500 046, India
| | - Mamina Bhol
- School of Chemistry, University of Hyderabad, Hyderabad, 500 046, India
| | - Palanisamy Kalimuthu
- Department of Chemistry, The Gandhigram Rural Institute (Deemed to be University), Gandhigram, 624 302, Tamil Nadu, India
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The first use of tri(1-naphthyl)phosphine oxide as ligand for rhenium(I)- complexes from phosphine via a one-pot approach. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2020.121657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Arevalo R, López R, Falvello LR, Riera L, Perez J. Building C(sp 3 ) Molecular Complexity on 2,2'-Bipyridine and 1,10-Phenanthroline in Rhenium Tricarbonyl Complexes. Chemistry 2021; 27:379-389. [PMID: 33001533 DOI: 10.1002/chem.202003814] [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: 08/17/2020] [Revised: 09/12/2020] [Indexed: 12/21/2022]
Abstract
The reactions of [Re(N-N)(CO)3 (PMe3 )]OTf (N-N=2,2'-bipyridine, bipy; 1,10-phenanthroline, phen) compounds with tBuLi and with LiHBEt3 have been explored. Addition to the N-N chelate took place with different site-selectivity depending on both chelate and nucleophile. Thus, with tBuLi, an unprecedented addition to C5 of bipy, a regiochemistry not accessible for free bipy, was obtained, whereas coordinated phen underwent tBuLi addition to C2 and C4. Remarkably, when LiHBEt3 reacted with [Re(bipy)(CO)3 (PMe3 )]OTf, hydride addition to the 4 and 6 positions of bipy triggered an intermolecular cyclodimerization of two dearomatized pyridyl rings. In contrast, hydride addition to the phen analog resulted in partial reduction of one pyridine ring. The resulting neutral ReI products showed a varied reactivity with HOTf and with MeOTf to yield cationic complexes. These strategies rendered access to ReI complexes containing bipy- and phen-derived chelates with several C(sp3 ) centers.
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Affiliation(s)
- Rebeca Arevalo
- Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, Julián Clavería, 8, 33006, Oviedo, Spain.,Current address: Department of Chemistry and Chemical Biology, University of California, Merced, 5200 N. Lake Road, 95343, Merced, CA, USA
| | - Ramón López
- Departamento de Química Física y Analítica, Universidad de Oviedo, Julián Clavería, 8, 33006, Oviedo, Spain
| | - Larry R Falvello
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain
| | - Lucía Riera
- Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, Julián Clavería, 8, 33006, Oviedo, Spain.,Centro de Investigación en Nanomateriales y Nanotecnología-CINN, CSIC- Universidad de Oviedo-Principado de Asturias, Avda. de la Vega 4-6, 33940, El Entrego, Spain
| | - Julio Perez
- Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, Julián Clavería, 8, 33006, Oviedo, Spain.,Centro de Investigación en Nanomateriales y Nanotecnología-CINN, CSIC- Universidad de Oviedo-Principado de Asturias, Avda. de la Vega 4-6, 33940, El Entrego, Spain
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Romain C, Bellemin-Laponnaz S, Dagorne S. Recent progress on NHC-stabilized early transition metal (group 3–7) complexes: Synthesis and applications. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213411] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Jin GX, Wang T, Sun Y, Li YL, Ma JP. Photochromic Rhenium-Based Molecular Rectangles: Syntheses, Structures, Photophysical Properties, and Electrochemistry. Inorg Chem 2020; 59:15019-15027. [DOI: 10.1021/acs.inorgchem.0c01845] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Guo-Xia Jin
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
| | - Teng Wang
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
| | - Yanyan Sun
- QiLu Pharmaceutical (HaiNan) Company Ltd., Haikou, Hainan 570314, People’s Republic of China
| | - Yu-Long Li
- College of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong 643000, People’s Republic of China
| | - Jian-Ping Ma
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
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Álvarez D, López-Castro E, Guerrero A, Riera L, Pérez J, Díaz J, Menéndez MI, López R. Influence of the Nucleophilic Ligand on the Reactivity of Carbonyl Rhenium(I) Complexes towards Methyl Propiolate: A Computational Chemistry Perspective. Molecules 2020; 25:molecules25184134. [PMID: 32927650 PMCID: PMC7571231 DOI: 10.3390/molecules25184134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/04/2020] [Accepted: 09/07/2020] [Indexed: 11/28/2022] Open
Abstract
A comparative theoretical study on the reactivity of the complexes [ReY(CO)3(bipy)] (Y = NH2, NHMe, NHpTol, OH, OMe, OPh, PH2, PHMe, PMe2, PHPh, PPh2, PMePh, SH, SMe, SPh; bipy = 2,2′-bipyridine) towards methyl propiolate was carried out to analyze the influence of both the heteroatom (N, O, P, S) and the alkyl and/or aryl substituents of the Y ligand on the nature of the product obtained. The methyl substituent tends to accelerate the reactions. However, an aromatic ring bonded to N and O makes the reaction more difficult, whereas its linkage to P and S favour it. On the whole, ligands with O and S heteroatoms seem to disfavour these processes more than ligands with N and P heteroatoms, respectively. Phosphido and thiolato ligands tend to yield a coupling product with the bipy ligand, which is not the general case for hydroxo, alcoxo or amido ligands. When the Y ligand has an O/N and an H atom the most likely product is the one containing a coupling with the carbonyl ligand, which is not always obtained when Y contains P/S. Only for OMe and OPh, the product resulting from formal insertion into the Re-Y bond is the preferred.
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Affiliation(s)
- Daniel Álvarez
- Departamento de Química Física y Analítica, Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Asturias, Spain; (D.Á.); (E.L.-C.); (A.G.); (M.I.M.)
| | - Elena López-Castro
- Departamento de Química Física y Analítica, Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Asturias, Spain; (D.Á.); (E.L.-C.); (A.G.); (M.I.M.)
| | - Arturo Guerrero
- Departamento de Química Física y Analítica, Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Asturias, Spain; (D.Á.); (E.L.-C.); (A.G.); (M.I.M.)
| | - Lucía Riera
- Centro de Investigación en Nanomateriales y Nanotecnología (CINN), CSIC-Universidad de Oviedo-Principado de Asturias, Avenida de la Vega 4-6, 33940 El Entrego, Spain; (L.R.); (J.P.)
| | - Julio Pérez
- Centro de Investigación en Nanomateriales y Nanotecnología (CINN), CSIC-Universidad de Oviedo-Principado de Asturias, Avenida de la Vega 4-6, 33940 El Entrego, Spain; (L.R.); (J.P.)
- Departamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Spain
| | - Jesús Díaz
- Departamento de Química Orgánica e Inorgánica, Universidad de Extremadura, Avenida de la Universidad s/n, 10071 Cáceres, Extremadura, Spain;
| | - M. Isabel Menéndez
- Departamento de Química Física y Analítica, Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Asturias, Spain; (D.Á.); (E.L.-C.); (A.G.); (M.I.M.)
| | - Ramón López
- Departamento de Química Física y Analítica, Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Asturias, Spain; (D.Á.); (E.L.-C.); (A.G.); (M.I.M.)
- Correspondence: ; Tel.: +34-985-102-967
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Phukon U, Priyatharsini M, Sathiyendiran M. Self-assembly of rhenium core-based conjoined bicyclic supramolecule from pyrazole and flexible hexatopic pyrazolyl ligands. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Petyuk MY, Berezin AS, Bagryanskaya IY, Artyushin OI, Brel VK, Artem'ev AV. A dinuclear Re(I) tricarbonyl complex showing thermochromic luminescence. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.108058] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Danjo H, Masuda Y, Kidena Y, Kawahata M, Ohara K, Yamaguchi K. Preparation of cage-shaped hexakis(spiroborate)s. Org Biomol Chem 2020; 18:3717-3723. [PMID: 32363369 DOI: 10.1039/d0ob00518e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In previous research studies, various types of prismatic cage-shaped molecular containers have been prepared and evaluated in terms of their guest inclusion properties. Basically, most of these molecular cages have a cationic or electron-deficient nature, and exhibit strong affinity mainly toward electron-rich aromatic guests. On the other hand, there is no report concerning anionic prismatic cages that are expected to recognize cationic polyaromatic guests with various structures and functions. In this manuscript, we present the preparation of hexakis(spiroborate)-type molecular cages, which was achieved by the reaction of phenylene- or biphenylenebis(dihydroxynaphthalene), hexahydroxytriphenylene, and boric acid in N,N-dimethylformamide. Their triangular prismatic hollow structures were confirmed by X-ray crystallographic analysis, and it was found that both phenylene- and biphenylene-bridged spiroborate cages have internal cavities of the corresponding size. It was also revealed that tetra(n-butylammonium) cations located inside the cavity and between the two adjacent spiroborate cages resulted in the formation of a one-dimensional columnar array. The molecular recognition behavior of the spiroborate cages was evaluated using tris(pyridinium)triazines as tricationic aromatic guests. 1H NMR measurement implied that a discrete 1 : 1 host-guest complex was formed when 1 equiv. of guest was added to the cage, whereas infinite one-dimensional aromatic stacks were constructed by the addition of 2 equiv. of guest.
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Affiliation(s)
- Hiroshi Danjo
- Department of Chemistry, Konan University, 8-9-1 Okamoto, Higashinada, Kobe 658-8501, Japan.
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Bauer EB, Haase AA, Reich RM, Crans DC, Kühn FE. Organometallic and coordination rhenium compounds and their potential in cancer therapy. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.04.014] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Arumugam R, Shankar B, Soumya KR, Sathiyendiran M. fac-Re(CO) 3-based neutral heteroleptic tetrahedrons. Dalton Trans 2019; 48:7425-7431. [PMID: 31041944 DOI: 10.1039/c8dt05065a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four new flexible ditopic nitrogen donors possessing a xylene spacer and 2-phenylbenzimidazolyl or its derivatives as a coordinating unit and one rigid bis-chelating ligand consisting of two 2-hydroxyphenylbenzimidazolyl motifs and a central phenylene spacer were synthesized and further used with Re2(CO)10 for making a new family of neutral, heteroleptic tetrahedral-shaped supramolecular coordination complexes via a one-pot approach. The new ligands and the complexes were characterized using various analytical and spectroscopic methods. The molecular structures of the complexes were determined using single crystal X-ray diffraction analysis, which reveal that four rhenium cores are arranged in the vertices, and four ligands are at the edges of the tetrahedron.
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Affiliation(s)
- Ramar Arumugam
- School of Chemistry, University of Hyderabad, Hyderabad -500 046, India.
| | - Bhaskaran Shankar
- School of Chemistry, University of Hyderabad, Hyderabad -500 046, India.
| | - K R Soumya
- School of Chemistry, University of Hyderabad, Hyderabad -500 046, India.
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Cauteruccio S, Licandro E, Panigati M, D'Alfonso G, Maiorana S. Modifying the properties of organic molecules by conjugation with metal complexes: The case of peptide nucleic acids and of the intrinsically chiral thiahelicenes. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.02.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Soumya KR, Arumugam R, Shankar B, Sathiyendiran M. Sulfate Donor Based Dinuclear Heteroleptic Triple-Stranded Helicates from Sulfite and Ditopic Nitrogen Donor Ligands and Their Transformation to Dinuclear Homoleptic Double-Stranded Mesocates. Inorg Chem 2018; 57:10718-10725. [PMID: 30106570 DOI: 10.1021/acs.inorgchem.8b01343] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sulfate donor based supramolecular coordination complexes [{ fac-Re(CO)3}(μ-SO4)(L n)2{ fac-Re(CO)3}] (1-3) were obtained using ditopic N donors (L n; n = 1-3), NaHSO3, and Re2(CO)10 in a one-pot, multicomponent, coordination-driven self-assembly approach, in which SO32- becomes oxidized to SO42- during the reaction and acts as a building framework. Complexes 1-3 were characterized using IR, ESI-TOF-MS, and 1H NMR spectroscopy. The structures of complexes 1-3 were confirmed using single-crystal X-ray diffraction analysis. The transformation of the dinuclear heteroleptic triple-stranded helicate to the dinuclear homoleptic double-stranded mesocate [{Re(CO)3Cl}2(L n)2] (L n = L1, L2, L3; 4a-6a) was achieved by the addition of BaCl2. The direct treatment of Re(CO)5X (X = Cl, Br) with L1/L2/L3 yielded the dinuclear homoleptic double-stranded helicates [{Re(CO)3X}2 (L n)2] (4b-6b and 7-9).
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Affiliation(s)
- K R Soumya
- School of Chemistry , University of Hyderabad , Hyderabad 500046 , India
| | - Ramar Arumugam
- School of Chemistry , University of Hyderabad , Hyderabad 500046 , India
| | - Bhaskaran Shankar
- School of Chemistry , University of Hyderabad , Hyderabad 500046 , India
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