1
|
Bruni PS, Schürch S. Mass Spectrometric Evaluation of β-Cyclodextrins as Potential Hosts for Titanocene Dichloride. Int J Mol Sci 2021; 22:ijms22189789. [PMID: 34575951 PMCID: PMC8467183 DOI: 10.3390/ijms22189789] [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: 08/03/2021] [Revised: 09/06/2021] [Accepted: 09/06/2021] [Indexed: 11/16/2022] Open
Abstract
Bent metallocene dichlorides (Cp2MCl2, M = Ti, Mo, Nb, …) have found interest as anti-cancer drugs in order to overcome the drawbacks associated with platinum-based therapeutics. However, they suffer from poor hydrolytic stability at physiological pH. A promising approach to improve their hydrolytic stability is the formation of host-guest complexes with macrocyclic structures, such as cyclodextrins. In this work, we utilized nanoelectrospray ionization tandem mass spectrometry to probe the interaction of titanocene dichloride with β-cyclodextrin. Unlike the non-covalent binding of phenylalanine and oxaliplatin to β-cyclodextrin, the mixture of titanocene and β-cyclodextrin led to signals assigned as [βCD + Cp2Ti–H]+, indicating a covalent character of the interaction. This finding is supported by titanated cyclodextrin fragment ions occurring from collisional activation. Employing di- and trimethylated β-cyclodextrins as hosts enabled the elucidation of the influence of the cyclodextrin hydroxy groups on the interaction with guest structures. Masking of the hydroxy groups was found to impair the covalent interaction and enabling the encapsulation of the guest structure within the hydrophobic cavity of the cyclodextrin. Findings are further supported by breakdown curves obtained by gas-phase dissociation of the various complexes.
Collapse
|
2
|
Senthilnathan D, Solomon RV, Kiruthika S, Venuvanalingam P, Sundararajan M. Are cucurbiturils better drug carriers for bent metallocenes? Insights from theory. J Biol Inorg Chem 2018; 23:413-423. [PMID: 29502216 DOI: 10.1007/s00775-018-1547-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 02/23/2018] [Indexed: 02/06/2023]
Abstract
Bent metallocenes (BM) have anti-tumor properties but they face a serious drug efficacy problem due to poor aqueous solubility and rapid hydrolysis under physiological conditions. These two problems can be fixed by encapsulating them in host molecules such as cyclodextrin (CD), cucurbituril (CB) etc. Experimentally, CD-BM, CB-BM host-guest complexes have been investigated to check the efficiency of the drug delivery and efficiency of the encapsulated drug. CB has been reported to be a better host than CD but the reasons for this has not been figured out. This can be done by finding out the mechanism of binding and the nature of the binding forces in both the inclusion complexes. This is exactly done here by performing a DFT study at BP86/TZP level on CB-BM host-guest systems. For comparison CD-BM with β-cyclodextrin as host have been studied. Four BMs (Cp2MCl2, M=Ti, V, Nb, Mo) and their corresponding cations (Cp2MCl+, Cp2M2+) are chosen as guests and they are encapsulated into cucurbit-[6]-uril (CB[6]) and cucurbit-[7]-uril(CB[7]) host systems. Computations reveal that CB[7] accommodates well the BMs over CB[6] due to their larger cavity size and also CB[7] is found to be a better host than β-cyclodextrin. BMs enter vertically rather than horizontally into the CB cavity. The reversible binding of BMs within CB[7] is controlled by various non-bonding interactions and mainly by hydrogen bonding between the portal oxygen atoms and Cp protons as revealed by QTAIM analysis. On the other hand, the interaction between the wall nitrogen atoms in CB[7] and chlorine atoms attached to the metal in BM strengthens the M-Cl bonds that prevents rapid hydrolysis of M-Cl and M-Cp bonds saving the drug. Comparatively, BMs experience less electrostatic attraction and more Pauli repulsion within β-cyclodextrin cavity and this affects the drug binding with CD. This makes β-cyclodextrin a less suitable drug carrier for BMs than CBs. Among the four BMs, niobocene binds strongly and titanocene binds weakly with CBs. EDA clearly shows that all the interactions between the guest and host are non-covalent in nature and electrostatic interactions outperform high-repulsion resulting in stable complexes. Cations form stronger complexes than neutral BMs. FMO analysis reveals that neutral BMs are less reactive compared to their cations and complexes are more reactive in CB[6] environment due to excess strain. QTAIM analysis helps to bring out the newer insights in these types of host-guest systems.
Collapse
Affiliation(s)
- Dhurairajan Senthilnathan
- Center for Computational Chemistry, CRD, PRIST University, Vallam, Thanjavur, Tamilnadu, 613403, India.
| | - Rajadurai Vijay Solomon
- Department of Chemistry, Madras Christian College (Autonomous), Tambaram East, Chennai, 600 059, India
| | - Shanmugam Kiruthika
- Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli, 620 024, India
| | - Ponnambalam Venuvanalingam
- Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli, 620 024, India
| | - Mahesh Sundararajan
- Theoretical Chemistry Section, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| |
Collapse
|
3
|
Supramolecular adducts of native and permethylated β-cyclodextrins with (2,2′-dipyridylamine)chlorido(1,4,7-trithiacyclononane)ruthenium(II) chloride: solid-state and biological activity studies. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-016-0117-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
4
|
Wang H, Lin H, Long Y, Ni B, He T, Zhang S, Zhu H, Wang X. Titanocene dichloride (Cp 2TiCl 2) as a precursor for template-free fabrication of hollow TiO 2 nanostructures with enhanced photocatalytic hydrogen production. NANOSCALE 2017; 9:2074-2081. [PMID: 28116371 DOI: 10.1039/c6nr09730h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A one-pot and template-free strategy for synthesizing hollow TiO2 nanostructures (HTSs) is developed by using titanocene dichloride as a titanium source, acetone as a solvent, and ammonia as a basic source. Transmission electron microscopy (TEM) observations demonstrate that the morphology transformation undergoes solid, yolk-shell and then hollow structures, typical of an Ostwald ripening process. Comparative experiments suggest that the mismatched hydrolysis rate of chloride anion and organic cyclopentadiene in unique titanocene dichloride (Cp2TiCl2) molecules should be responsible for the formation of HTSs. The TiO2 nanostructures exhibit controllable morphologies and tunable sizes by mainly adjusting the amounts of the titanium precursor or ammonia. The HTSs show much improved photocatalytic performance as compared with samples of other morphologies in water splitting application, due to the remarkably increased surface area and active sites, and enhanced mass transfer. Our findings reported herein may offer new perspectives in materials chemistry, and energy- and environment-related applications.
Collapse
Affiliation(s)
- Haiqing Wang
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Haifeng Lin
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Yong Long
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Bing Ni
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Ting He
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Simin Zhang
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Huihui Zhu
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Xun Wang
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| |
Collapse
|
5
|
Gomes AC, Magalhães CIR, Oliveira TSM, Lopes AD, Gonçalves IS, Pillinger M. Solid-state study of the structure and host–guest chemistry of cucurbituril-ferrocene inclusion complexes. Dalton Trans 2016; 45:17042-17052. [DOI: 10.1039/c6dt02811j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Solid-state host–guest interactions have been investigated for cucurbit[n]uril-ferrocene inclusion compounds (n = 7, 8) prepared via a microwave-assisted hydrothermal approach.
Collapse
Affiliation(s)
- Ana C. Gomes
- Department of Chemistry
- CICECO - Aveiro Institute of Materials
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | - Clara I. R. Magalhães
- Department of Chemistry
- CICECO - Aveiro Institute of Materials
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | - Tânia S. M. Oliveira
- Faculty of Science and Technology
- CIQA
- University of the Algarve
- 8005-136 Faro
- Portugal
| | - André D. Lopes
- Faculty of Science and Technology
- CIQA
- University of the Algarve
- 8005-136 Faro
- Portugal
| | - Isabel S. Gonçalves
- Department of Chemistry
- CICECO - Aveiro Institute of Materials
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | - Martyn Pillinger
- Department of Chemistry
- CICECO - Aveiro Institute of Materials
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| |
Collapse
|
6
|
Braga SS, Mokal V, Paz FAA, Pillinger M, Branco AF, Sardão VA, Diogo CV, Oliveira PJ, Marques MPM, Romão CC, Gonçalves IS. Synthesis, Characterisation and Antiproliferative Studies of Allyl(dicarbonyl)(cyclopentadienyl)molybdenum Complexes and Cyclodextrin Inclusion Compounds. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402540] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
7
|
de Paiva REF, Abbehausen C, Bergamini FRG, Thompson AL, Alves DA, Lancellotti M, Corbi PP. Investigating the inclusion of the Ag(I)-nimesulide complex into β-cyclodextrin: studies in solution and in the solid state. J INCL PHENOM MACRO 2013. [DOI: 10.1007/s10847-013-0348-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
8
|
Analysis of the microcrystalline inclusion compounds of triclosan with β-cyclodextrin and its tris-O-methylated derivative. J Pharm Biomed Anal 2013; 80:34-43. [PMID: 23523864 DOI: 10.1016/j.jpba.2013.02.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2013] [Revised: 02/18/2013] [Accepted: 02/21/2013] [Indexed: 11/24/2022]
Abstract
Solid 1:1 inclusion compounds of triclosan with native and permethylated β-cyclodextrin (β-CD and TRIMEB) were prepared by co-crystallisation and co-evaporation, respectively, and studied by FT-IR and (13)C{(1)H} CP/MAS NMR spectroscopies, thermogravimetric analysis, X-ray diffraction and theoretical calculations. Results showed that triclosan inclusion into TRIMEB afforded an amorphous solid, whilst β-CD·triclosan is composed of microcrystals belonging to two different phases. In the phase featuring larger crystals, X-ray diffraction was carried out and the β-CD host units, packing head-to-head in infinite channels, were refined; the geometry for the included but highly disordered triclosan molecules was assessed by theoretical calculations. The bacterial growth inhibitory action of the inclusion compounds was studied in comparison to that of pure triclosan on Gram-negative (Salmonella, Escherichia) and Gram-positive strains (Bacillus, Listeria, Enterococcus and Staphylococcus) typically associated with human pathologies, and also on environmental bacteria isolated from different soil and water sources. The antimicrobial activities obtained in the present work showed that, of the two CD hosts, TRIMEB brings the most favourable carrier effect: it reduced the toxicity of triclosan against some of the environmental strains and afforded slightly higher action against virulent strains.
Collapse
|
9
|
Ramos AI, Braga TM, Silva P, Fernandes JA, Ribeiro-Claro P, Lopes MDFS, Paz FAA, Braga SS. Chloramphenicol·cyclodextrin inclusion compounds: co-dissolution and mechanochemical preparations and antibacterial action. CrystEngComm 2013. [DOI: 10.1039/c3ce26414a] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
10
|
Abstract
The potential application of metallocene complexes into the cancer research was established by the pioneer work of Köpf-Maeir and Köpf in the late 1970s. The combination of organometallic chemistry and biochemistry created a new research area: bioorganometallic chemistry. Bioorganometallic chemistry has developed rapidly in the last thirty years leading to application of organometallic species into diagnostic, sensors, immunoassays and anticancer research among others. This review focuses on the bioorganometallic chemistry of molybdenocene dichloride and its derivatives as metal-based anticancer drugs. The anticancer properties of molybdenocene dichloride and its derivatives are described as well as the mechanism of action, aqueous and coordination chemistry, and molybdenocene-biomolecule interactions.
Collapse
Affiliation(s)
- Enrique Meléndez
- University of Puerto Rico Department of Chemistry, PO Box 9019 Mayagüez Puerto Rico 00681
| |
Collapse
|
11
|
Thermal release behavior of Fe+, CpFe+ and (Cp)2Fe+ ions from the molecular aggregate of β-cyclodextrin with ferrocene. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2009.10.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
12
|
Cyclodextrins improve the antimicrobial activity of the chloride salt of Ruthenium(II) chloro-phenanthroline-trithiacyclononane. Biometals 2009; 22:541-56. [DOI: 10.1007/s10534-009-9211-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Accepted: 01/19/2009] [Indexed: 10/21/2022]
|
13
|
Marques J, Santos TM, Marques MP, Braga SS. A glycine ruthenium trithiacyclononane complex and its molecular encapsulation using cyclodextrins. Dalton Trans 2009:9812-9. [PMID: 19885528 DOI: 10.1039/b915839a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Joana Marques
- Department of Chemistry, CICECO, University of Aveiro, 3810-193, Aveiro, Portugal
| | | | | | | |
Collapse
|
14
|
Pereira CCL, Diogo CV, Burgeiro A, Oliveira PJ, Marques MPM, Braga SS, Paz FAA, Pillinger M, Gonçalves IS. Complex Formation between Heptakis(2,6-di-O-methyl)-β-cyclodextrin and Cyclopentadienyl Molybdenum(II) Dicarbonyl Complexes: Structural Studies and Cytotoxicity Evaluations. Organometallics 2008. [DOI: 10.1021/om800413w] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cláudia C. L. Pereira
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Cátia V. Diogo
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Ana Burgeiro
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Paulo J. Oliveira
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Maria Paula M. Marques
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Susana S. Braga
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Filipe A. Almeida Paz
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Martyn Pillinger
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Isabel S. Gonçalves
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| |
Collapse
|
15
|
Marques J, Anjo L, Marques MP, Santos TM, Almeida Paz FA, Braga SS. Structural studies on supramolecular adducts of cyclodextrins with the complex [Ru([9]aneS3)(bpy)Cl]Cl. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2008.06.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
16
|
Morales A, Weber RT, Melendez E. Spectroscopic and Thermal Characterization of the Host-Guest Interactions between α-, β-, and γ-cyclodextrins and vanadocene dichloride. Appl Organomet Chem 2008; 22:440-450. [PMID: 19881887 PMCID: PMC2770188 DOI: 10.1002/aoc.1420] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Host-guest interactions between α-, β-, and γ-cyclodextrins and vanadocene dichloride (Cp(2)VCl(2)) have been investigated by a combination of thermogravimetric analysis, differential scanning calorimeters, PXRD and solid state and solution EPR spectroscopy. The solid state results demonstrated that only β- and γ-cyclodextrins form 1:1 inclusion complexes, while α-cyclodextrin does not form an inclusion complex with Cp(2)VCl(2). The β- and γ-CD-Cp(2)VCl(2) inclusion complexes exhibited anisotropic electron-(51)V (I = 7/2) hyperfine coupling constants whereas the α-CD- Cp(2)VCl(2) system showed only an asymmetric peak with no anisotropic hyperfine constant. On the other hand, solution EPR spectroscopy showed that α-CD may be involved in weak host-guest interactions in equilibrium with free vanadocene species.
Collapse
Affiliation(s)
- Alexis Morales
- University of Puerto Rico, Department of Chemistry PO Box 9019 Mayaguez, PR 00681
| | - Ralph T. Weber
- EPR Division Bruker BioSpin Corporation 44 Manning Road, Billerica, MA 01821
| | - Enrique Melendez
- University of Puerto Rico, Department of Chemistry PO Box 9019 Mayaguez, PR 00681
| |
Collapse
|
17
|
Petrovski Ž, Norton de Matos MR, Braga SS, Pereira CC, Matos ML, Gonçalves IS, Pillinger M, Alves PM, Romão CC. Synthesis, characterization and antitumor activity of 1,2-disubstituted ferrocenes and cyclodextrin inclusion complexes. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2007.11.053] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
18
|
Buck DP, Abeysinghe PM, Cullinane C, Day AI, Collins JG, Harding MM. Inclusion complexes of the antitumour metallocenes Cp2MCl2 (M = Mo, Ti) with cucurbit[n]urils. Dalton Trans 2008:2328-34. [PMID: 18414758 DOI: 10.1039/b718322d] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Damian P Buck
- School of Physical, Environmental and Mathematical Sciences, University College, Australian Defence Force Academy, Canberra, ACT 2600, Australia
| | | | | | | | | | | |
Collapse
|
19
|
Pereira CCL, Nolasco M, Braga SS, Paz FAA, Ribeiro-Claro P, Pillinger M, Gonçalves IS. A Combined Theoretical−Experimental Study of the Inclusion of Niobocene Dichloride in Native and Permethylated β-Cyclodextrins. Organometallics 2007. [DOI: 10.1021/om7003749] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Mariela Nolasco
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Susana S. Braga
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | | | - Paulo Ribeiro-Claro
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Martyn Pillinger
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Isabel S. Gonçalves
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
20
|
Grandeury A, Condamine E, Hilfert L, Gouhier G, Petit S, Coquerel G. Chiral Discrimination in Host−Guest Supramolecular Complexes. Understanding Enantioselectivity and Solid Solution Behaviors by Using Spectroscopic Methods and Chemical Sensors. J Phys Chem B 2007; 111:7017-26. [PMID: 17547451 DOI: 10.1021/jp071428o] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diastereomeric host-guest associations formed between permethylated-beta-cyclodextrin (TMbeta-Cd) and the two enantiomers of p-bromophenylethanol (pBrPE) were characterized in aqueous solution by NMR spectroscopy, revealing similar inclusion geometries and weak binding constants, whatever the guest configuration. These features were confirmed by hydrogenation experiments, and do not allow to account for the ability of TMbeta-Cd to resolve racemic pBrPE by successive crystallizations [Grandeury, A.; Petit, S.; Gouhier, G.; Agasse, V.; Coquerel, G. Tetrahedron: Asymmetry 2003, 14, 2143-2152]. The analysis, by means of solid-state NMR, oxidation experiments, and solubility measurements, of the two crystalline phases containing known proportions of guest enantiomers revealed identical inclusion geometries in a given phase, irrespective of the enantiomeric composition. The corresponding solid solutions were further characterized by the determination of an isothermal section (40 degrees C) in the relevant ternary phase diagram. It appears from all these data that chiral resolution mechanisms in this system can only be envisaged in terms of nucleation conditions of each crystal form (with its specific inclusion geometry) and enantiomeric recognition at crystal solution interfaces during the growth of each crystal packing.
Collapse
Affiliation(s)
- Arnaud Grandeury
- Unité de Croissance Cristalline et de Modélisation Moléculaire, Sciences et Méthodes Séparatives, UPRES EA 3233, IRCOF, Université de Rouen, F-76821 Mont Saint-Aignan Cedex, France
| | | | | | | | | | | |
Collapse
|
21
|
Abeysinghe PM, Harding MM. Antitumour bis(cyclopentadienyl) metal complexes: titanocene and molybdocene dichloride and derivatives. Dalton Trans 2007:3474-82. [PMID: 17680034 DOI: 10.1039/b707440a] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Perspective will focus on recent developments in the field of antitumour metallocenes structurally related to titanocene dichloride. Despite extensive testing of titanocene dichloride which culminated in phase I and II clinical trials, further trials have been abandoned. While DNA has been implicated as the major target related to anticancer activity, identification of the active species and mechanism of action has been poorly understood and hence the design of second generation titanocene derivatives has not been possible. Recent mechanistic studies have provided a plausible mechanism for delivery of Ti to cancer cells via transferrin mediated endocytosis. This mechanism requires the presence of labile Cp-Ti bonds that hydrolyse on a time scale to deliver Ti to transferrin. A large range of titanocene derivatives in which the cyclopentadienyl rings have been substituted by both electron withdrawing and donating groups, including aromatic, alkyl and cyclic amines, have been prepared and tested for activity in the last 5 years. These results have shown that subtle structural effects can have a significant effect on biological activity and that biological activity is highly cell line dependent. However, the biological chemistry and cellular studies required to determine the mechanism of action of these new titanocenes have not been reported. In contrast, the bioorganometallic chemistry and cellular studies of molybdocene dichloride have implicated interaction with cellular thiols as the key reaction related to biological activity. Tailoring of the pseudohalide ligands by tuning the strength of the Mo-S bonds provides the opportunity to enhance cell uptake. Further research is required to establish the origin of antitumour activity.
Collapse
|
22
|
Pereira CCL, Braga SS, Paz FAA, Pillinger M, Klinowski J, Gonçalves IS. Structural Studies of [CpMoL2(CO)2]+ (L = NCMe, L2 = 2,2′-biimidazole) Complexes and Their Inclusion Compounds with Cyclodextrins. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600551] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
23
|
Braga SS, Almeida Paz FA, Pillinger M, Seixas JD, Romão CC, Gonçalves IS. Structural Studies of β-Cyclodextrin and Permethylated β-Cyclodextrin Inclusion Compounds of Cyclopentadienyl Metal Carbonyl Complexes. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200501006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
24
|
Hapiot F, Tilloy S, Monflier E. Cyclodextrins as Supramolecular Hosts for Organometallic Complexes. Chem Rev 2006; 106:767-81. [PMID: 16522008 DOI: 10.1021/cr050576c] [Citation(s) in RCA: 334] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F Hapiot
- Université d'Artois, Laboratoire de Physico-Chimie des Interfaces et Applications, FRE CNRS 2485, Rue Jean Souvraz, SP 18-62307 Lens Cédex, France
| | | | | |
Collapse
|