1
|
Efficient sorption of Mo(VI) from a synthetic solution of uranium and several fission elements on 8-quinolinol grafted silica. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
2
|
Gao T, Meng L, Zeng G, Hao Z, Han Z, Feng Q, Lin J. Copper(II) complexes supported by 8-hydroxyquinoline-imine ligands: Synthesis, characterization and catalysis in aerobic alcohols oxidation. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115984] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
3
|
Kotian A, Kamat V, Naik K, Kokare DG, Kumara K, Neratur KL, Kumbar V, Bhat K, Revankar VK. 8-Hydroxyquinoline derived p-halo N4-phenyl substituted thiosemicarbazones: Crystal structures, spectral characterization and in vitro cytotoxic studies of their Co(III), Ni(II) and Cu(II) complexes. Bioorg Chem 2021; 112:104962. [PMID: 33992968 DOI: 10.1016/j.bioorg.2021.104962] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 04/22/2021] [Accepted: 04/30/2021] [Indexed: 10/21/2022]
Abstract
The current paper deals with 8-hydroxyquinoline derived p-halo N4-phenyl substituted thiosemicarbazones, their crystal structures, spectral characterization and in vitro cytotoxic studies of Co(III), Ni(II) and Cu(II) complexes. The molecular structures of the ligands, (E)-4-(4-halophenyl)-1-((8-hydroxyquinoline-2-yl)methylene)thiosemicarbazones (halo = fluoro/chloro/bromo) are determined by single crystal X-ray diffraction method. The crystal structures reveal that the ligands are non-planar and exist in their thioamide tautomeric forms. The various physicochemical investigations of the synthesized complexes reveal metal to ligand stoichiometry to be 1:2 in Co(III) complexes whereas 1:1 in Ni(II) and Cu(II) complexes. The ligands coordinate in a tridentate NNS fashion around Co(III) centers to form an octahedral geometry and square planar geometry around Ni(II) and Cu(II) metal centers. The oxidation of Co(II) to Co(III) is observed on complexation. The synthesized compounds are subjected to in vitro cytotoxicity studies. When compared to bare ligands, the complexes show enhancement of the antiproliferative activity against MCF-7, breast cancer cell lines. The Co(III) complexes of fluoro and bromo derivatives of ligands have displayed remarkable results with roughly two fold increase in their activity in correlation to the standard drug, Paclitaxel. Moreover, the fluorescence microscopy images of cells stained with acridine orange-ethidium bromide suggest an apoptotic mode of cell death.
Collapse
Affiliation(s)
- Avinash Kotian
- Department of Chemistry, Karnatak University, Dharwad 580 003, Karnataka, India
| | - Vinayak Kamat
- Department of Chemistry, Karnatak University, Dharwad 580 003, Karnataka, India
| | - Krishna Naik
- Department of Chemistry, Karnatak University, Dharwad 580 003, Karnataka, India
| | - Dhoolesh G Kokare
- Department of Chemistry, Karnatak University, Dharwad 580 003, Karnataka, India
| | - Karthik Kumara
- Department of Studies in Physics, University of Mysore, Manasagangotri, Mysuru 570 006, India; Department of Physics, School of Sciences-I JAIN (Deemed to be) University, Bengaluru 560011, India
| | | | - Vijay Kumbar
- Maratha Mandal's Central Research Laboratory, Maratha Mandal Dental College and Research Centre, Belgaum, Karnataka, India
| | - Kishore Bhat
- Maratha Mandal's Central Research Laboratory, Maratha Mandal Dental College and Research Centre, Belgaum, Karnataka, India
| | - Vidyanand K Revankar
- Department of Chemistry, Karnatak University, Dharwad 580 003, Karnataka, India.
| |
Collapse
|
4
|
Sa J, Guénée L, Pal P, Hamacek J. Lanthanide Podands with a Short Tripodal Ligand: The Missing Piece of Puzzle. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000861] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Jing‐Peng Sa
- Department of Inorganic and Analytical Chemistry University of Geneva 30 quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Laure Guénée
- Laboratory of Crystallography University of Geneva 24 quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Prodipta Pal
- Department of Physical Chemistry University of Geneva 30 quai Ernest-Ansermet 1211 Geneva 4 Switzerland
- Department of Chemistry, Amity Institute of Applied Sciences Amity University Kolkata Major Arterial Road (South-East), Action Area II, Newtown Kolkata West Bengal 700135 India
| | - Josef Hamacek
- Department of Inorganic and Analytical Chemistry University of Geneva 30 quai Ernest-Ansermet 1211 Geneva 4 Switzerland
- Centre for Molecular Biophysics (CBM) CNRS UPR4301 Rue Charles Sadron 45071 Orléans France
| |
Collapse
|
5
|
Afanasyev OI, Kuchuk EA, Muratov KM, Denisov GL, Chusov D. Symmetrical Tertiary Amines: Applications and Synthetic Approaches. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001171] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Oleg I. Afanasyev
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova St. 28 Moscow 119991 Russian Federation
| | - Ekaterina A. Kuchuk
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova St. 28 Moscow 119991 Russian Federation
| | - Karim M. Muratov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova St. 28 Moscow 119991 Russian Federation
| | - Gleb L. Denisov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova St. 28 Moscow 119991 Russian Federation
| | - Denis Chusov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova St. 28 Moscow 119991 Russian Federation
- National Research University Higher School of Economics Miasnitskaya Str. 20 Moscow 101000 Russian Federation
| |
Collapse
|
6
|
Enel M, Leygue N, Balayssac S, Laurent S, Galaup C, Vander Elst L, Picard C. New polyaminocarboxylate macrocycles containing phenolate binding units: synthesis, luminescent and relaxometric properties of their lanthanide complexes. Dalton Trans 2018; 46:4654-4668. [PMID: 28327741 DOI: 10.1039/c7dt00291b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of two new polyaminocarboxylate macrocycles incorporating one or two intracyclic phenol units (H4L1 and H8L2, respectively) is described. The 12-membered H4L1 macrocycle leads to soluble and stable mononuclear LnIII complexes of [(L1)Ln(H2O)2]- composition (Ln = Eu, Tb and Gd) in aqueous solutions. In Tris buffer (pH 7.4), the [(L1)Tb(H2O)2]- complex displays a suitable efficiency for sensitized emission (ηsens = 48%) and a high luminescence quantum yield (Φ = 22%), which is worthy of note for a bis-hydrated terbium complex. Besides, luminescence experiments show that bidentate endogenous anions (citrate, carbonate, and phosphate) do not displace the two inner-sphere water molecules of this complex. In contrast, the possible presence of LMCT states causes the europium complex to be weakly luminescent. The [(L1)Gd(H2O)2]- complex is characterized by high relaxivity (r = 7.2 s-1 mM-1 at 20 MHz) and a very short water residence time of the coordinated water molecules (τ = 9 ns), promising values for the realisation of macromolecular systems with high relaxivities. Thus, the Tb and Gd complexes of the H4L1 macrocycle exhibit several improvements in terms of luminescent (lower excitation energy, higher brightness) and relaxometric (shorter τM) properties compared to the corresponding LnPCTA complexes, where a phenol moiety substitutes a pyridine ring. On the other hand, the 24-membered H8L2 macrocycle including two phenol units in its structure leads to dinuclear complexes of [(L2)Ln2]2- composition. Its terbium complex shows a long luminescence lifetime (2 ms) and a high quantum yield (43%) in aqueous solutions, making this compound a new promising candidate for time-resolved applications.
Collapse
Affiliation(s)
- Morgane Enel
- CNRS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, UMR-5068, 118 Route de Narbonne, F-31062 Toulouse cedex 9, France. and Université de Toulouse, UPS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, 118 route de Narbonne, F-31062 Toulouse cedex 9, France
| | - Nadine Leygue
- CNRS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, UMR-5068, 118 Route de Narbonne, F-31062 Toulouse cedex 9, France. and Université de Toulouse, UPS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, 118 route de Narbonne, F-31062 Toulouse cedex 9, France
| | - Stéphane Balayssac
- CNRS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, UMR-5068, 118 Route de Narbonne, F-31062 Toulouse cedex 9, France. and Université de Toulouse, UPS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, 118 route de Narbonne, F-31062 Toulouse cedex 9, France
| | - Sophie Laurent
- NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons, 23 Place du Parc, B-7000 Mons, Belgium. and Center for Microscopy and Molecular Imaging (CMMI), Rue Adrienne Bolland, 8, B-6041 Gosselies, Belgium
| | - Chantal Galaup
- CNRS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, UMR-5068, 118 Route de Narbonne, F-31062 Toulouse cedex 9, France. and Université de Toulouse, UPS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, 118 route de Narbonne, F-31062 Toulouse cedex 9, France
| | - Luce Vander Elst
- NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons, 23 Place du Parc, B-7000 Mons, Belgium. and Center for Microscopy and Molecular Imaging (CMMI), Rue Adrienne Bolland, 8, B-6041 Gosselies, Belgium
| | - Claude Picard
- CNRS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, UMR-5068, 118 Route de Narbonne, F-31062 Toulouse cedex 9, France. and Université de Toulouse, UPS, Laboratoire de Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique, SPCMIB, 118 route de Narbonne, F-31062 Toulouse cedex 9, France
| |
Collapse
|
7
|
Hamacek J, Vuillamy A. Controlling the Structures of Lanthanide Complexes in Self-Assemblies with Tripodal Ligands. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201701075] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Josef Hamacek
- Center for Molecular Biophysics (CBM); CNRS Orléans; Rue Charles Sadron 45071 Orleans Cedex 2 France
| | - Alexandra Vuillamy
- Center for Molecular Biophysics (CBM); CNRS Orléans; Rue Charles Sadron 45071 Orleans Cedex 2 France
| |
Collapse
|
8
|
Carmo dos Santos NA, Natali M, Badetti E, Wurst K, Licini G, Zonta C. Cobalt, nickel, and iron complexes of 8-hydroxyquinoline-di(2-picolyl)amine for light-driven hydrogen evolution. Dalton Trans 2017; 46:16455-16464. [DOI: 10.1039/c7dt02666h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Novel first-row transition metal complexes based on the 8-hydroxyquinoline-di(2-picolyl)amine ligand were prepared and tested as potential HECs in light-driven experiments.
Collapse
Affiliation(s)
| | - Mirco Natali
- Department of Chemical and Pharmaceutical Sciences
- University of Ferrara
- and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SolarChem)
- sez. di Ferrara
- 44121 Ferrara
| | - Elena Badetti
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| | - Klaus Wurst
- Institute of General
- Inorganic and Theoretical Chemistry
- University of Innsbruck
- A-6020 Innsbruck
- Austria
| | - Giulia Licini
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| | - Cristiano Zonta
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| |
Collapse
|
9
|
Barry DE, Caffrey DF, Gunnlaugsson T. Lanthanide-directed synthesis of luminescent self-assembly supramolecular structures and mechanically bonded systems from acyclic coordinating organic ligands. Chem Soc Rev 2016; 45:3244-74. [PMID: 27137947 DOI: 10.1039/c6cs00116e] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Herein some examples of the use of lanthanide ions (f-metal ions) to direct the synthesis of luminescent self-assembly systems (architectures) will be discussed. This area of lanthanide supramolecular chemistry is fast growing, thanks to the unique physical (magnetic and luminescent) and coordination properties of the lanthanides, which are often transferred to the resulting supermolecule. The emphasis herein will be on systems that are luminescent, and hence, generated by using either visibly emitting ions (such as Eu(III), Tb(III) and Sm(III)) or near infrared emitting ions (like Nd(III), Yb(III) and Er(III)), formed through the use of templating chemistry, by employing structurally simple ligands, possessing oxygen and nitrogen coordinating moieties. As the lanthanides have high coordination requirements, their use often allows for the formation of coordination compounds and supramolecular systems such as bundles, grids, helicates and interlocked molecules that are not synthetically accessible through the use of other commonly used templating ions such as transition metal ions. Hence, the use of the rare-earth metal ions can lead to the formation of unique and stable species in both solution and in the solid state, as well as functional and responsive structures.
Collapse
Affiliation(s)
- Dawn E Barry
- School of Chemistry and Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, The University of Dublin, Dublin 2, Ireland.
| | | | | |
Collapse
|
10
|
Molecular Magnetic Resonance Imaging Probes Based on Ln3+ Complexes. ADVANCES IN INORGANIC CHEMISTRY 2016. [DOI: 10.1016/bs.adioch.2015.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
11
|
Areti S, Bandaru S, Teotia R, Rao CP. Water-Soluble 8-Hydroxyquinoline Conjugate of Amino-Glucose As Receptor for La3+ in HEPES Buffer, on Whatman Cellulose Paper and in Living Cells. Anal Chem 2015; 87:12348-54. [DOI: 10.1021/acs.analchem.5b03723] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Sivaiah Areti
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sateesh Bandaru
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Rohit Teotia
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Chebrolu P. Rao
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| |
Collapse
|
12
|
Moula Karimdjy M, Tallec G, Fries PH, Imbert D, Mazzanti M. Confinement of a tris-aqua Gd(iii) complex in silica nanoparticles leads to high stability and high relaxivity and supresses anion binding. Chem Commun (Camb) 2015; 51:6836-8. [DOI: 10.1039/c5cc01352f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Confinement of [Gd(dhqN-SO3)(H2O)3]3− in silica nanoparticles prevents transmetallation or anion binding, yielding high relaxivity over a range of magnetic fields.
Collapse
Affiliation(s)
| | | | | | - Daniel Imbert
- Univ. Grenoble Alpes
- INAC-LCIB
- RICC
- F-38000 Grenoble
- France
| | - Marinella Mazzanti
- Institut des Sciences et Ingénierie Chimiques
- Ecole Polytechnique Fédérale de Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland
| |
Collapse
|
13
|
Martins AF, Eliseeva SV, Carvalho HF, Teixeira JMC, Paula CTB, Hermann P, Platas-Iglesias C, Petoud S, Tóth E, Geraldes CFGC. A bis(pyridine N-oxide) analogue of DOTA: relaxometric properties of the Gd(III) complex and efficient sensitization of visible and NIR-emitting lanthanide(III) cations including Pr(III) and Ho(III). Chemistry 2014; 20:14834-45. [PMID: 25236257 DOI: 10.1002/chem.201403856] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Indexed: 11/07/2022]
Abstract
We report the synthesis of a cyclen-based ligand (4,10-bis[(1-oxidopyridin-2-yl)methyl]-1,4,7,10-tetraazacyclododecane-1,7-diacetic acid=L1) containing two acetate and two 2-methylpyridine N-oxide arms anchored on the nitrogen atoms of the cyclen platform, which has been designed for stable complexation of lanthanide(III) ions in aqueous solution. Relaxometric studies suggest that the thermodynamic stability and kinetic inertness of the Gd(III) complex may be sufficient for biological applications. A detailed structural study of the complexes by (1) H NMR spectroscopy and DFT calculations indicates that they adopt an anti-Δ(λλλλ) conformation in aqueous solution, that is, an anti-square antiprismatic (anti-SAP) isomeric form, as demonstrated by analysis of the (1) H NMR paramagnetic shifts induced by Yb(III) . The water-exchange rate of the Gd(III) complex is ${k{{298\hfill \atop {\rm ex}\hfill}}}$=6.7×10(6) s(-1) , about a quarter of that for the mono-oxidopyridine analogue, but still about 50 % higher than the ${k{{298\hfill \atop {\rm ex}\hfill}}}$ of GdDOTA (DOTA=1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid). The 2-methylpyridine N-oxide chromophores can be used to sensitize a wide range of Ln(III) ions emitting in both the visible (Eu(III) and Tb(III) ) and NIR (Pr(III) , Nd(III) , Ho(III) , Yb(III) ) spectral regions. The emission quantum yield determined for the Yb(III) complex (${Q{{{\rm L}\hfill \atop {\rm Yb}\hfill}}}$=7.3(1)×10(-3) ) is among the highest ever reported for complexes of this metal ion in aqueous solution. The sensitization ability of the ligand, together with the spectroscopic and relaxometric properties of its complexes, constitute a useful step forward on the way to efficient dual probes for optical imaging (OI) and MRI.
Collapse
Affiliation(s)
- André F Martins
- Department of Life Sciences, Faculty of Science and Technology, University of Coimbra, P. O. Box 3046, 3001-401 Coimbra (Portugal); Coimbra Chemistry Center, Rua Larga, University of Coimbra, 3004-535 Coimbra (Portugal); Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans (France)
| | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Hossain S, Das S, Chakraborty A, Lloret F, Cano J, Pardo E, Chandrasekhar V. S-shaped decanuclear heterometallic [Ni8Ln2] complexes [Ln(iii) = Gd, Tb, Dy and Ho]: theoretical modeling of the magnetic properties of the gadolinium analogue. Dalton Trans 2014; 43:10164-74. [DOI: 10.1039/c4dt00465e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
S-shaped [Ni8Ln2] complexes were synthesized and characterized. Strong NiII–NiII antiferromagnetic interactions and weak NiII–LnIII interactions were observed.
Collapse
Affiliation(s)
- Sakiat Hossain
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016, India
| | - Sourav Das
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016, India
| | - Amit Chakraborty
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016, India
| | - Francesc Lloret
- Departament de Química Inorgànica
- Instituto de Ciencia Molecular (ICMOL)
- Universitat de València
- 46980 Paterna, Spain
| | - Joan Cano
- Departament de Química Inorgànica
- Instituto de Ciencia Molecular (ICMOL)
- Universitat de València
- 46980 Paterna, Spain
| | - Emilio Pardo
- Departament de Química Inorgànica
- Instituto de Ciencia Molecular (ICMOL)
- Universitat de València
- 46980 Paterna, Spain
| | - Vadapalli Chandrasekhar
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016, India
- National Institute of Science Education and Research
- Institute of Physics Campus
| |
Collapse
|
15
|
Regueiro-Figueroa M, Nonat A, Rolla GA, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Charbonnière LJ, Botta M, Platas-Iglesias C. Self-Aggregated Dinuclear Lanthanide(III) Complexes as Potential Bimodal Probes for Magnetic Resonance and Optical Imaging. Chemistry 2013; 19:11696-706. [DOI: 10.1002/chem.201301231] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Indexed: 11/10/2022]
|
16
|
Chandrasekhar V, Hossain S, Das S, Biswas S, Sutter JP. Rhombus-shaped tetranuclear [Ln4] complexes [Ln = Dy(III) and Ho(III)]: synthesis, structure, and SMM behavior. Inorg Chem 2013; 52:6346-53. [PMID: 23679856 DOI: 10.1021/ic302848k] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The reaction of a new hexadentate Schiff base hydrazide ligand (LH3) with rare earth(III) chloride salts in the presence of triethylamine as the base afforded two planar tetranuclear neutral complexes: [{(LH)2Dy4}(μ2-O)4](H2O)8·2CH3OH·8H2O (1) and [{(LH)2Ho4}(μ2-O)4](H2O)8·6CH3OH·4H2O (2). These neutral complexes possess a structure in which all of the lanthanide ions and the donor atoms of the ligand remain in a perfect plane. Each doubly deprotonated ligand holds two Ln(III) ions in its two distinct chelating coordination pockets to form [LH(Ln)2](4+) units. Two such units are connected by four [μ2-O](2-) ligands to form a planar tetranuclear assembly with an Ln(III)4 core that possesses a rhombus-shaped structure. Detailed static and dynamic magnetic analysis of 1 and 2 revealed single-molecule magnet (SMM) behavior for complex 1. A peculiar feature of the χM" versus temperature curve is that two peaks that are frequency-dependent are revealed, indicating the occurrence of two relaxation processes that lead to two energy barriers (16.8 and 54.2 K) and time constants (τ0 = 1.4 × 10(-6) s, τ0 = 7.2 × 10(-7) s). This was related to the presence of two distinct geometrical sites for Dy(III) in complex 1.
Collapse
|
17
|
De Bonis M, Bianco G, Amati M, Belviso S, Cataldi TRI, Lelj F. An interplay between infrared multiphoton dissociation Fourier-transform ion cyclotron resonance mass spectrometry and density functional theory computations in the characterization of a tripodal quinolin-8-olate Gd(III) complex. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:589-601. [PMID: 23436232 DOI: 10.1007/s13361-012-0570-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 12/07/2012] [Accepted: 12/18/2012] [Indexed: 06/01/2023]
Abstract
A new hexadentate, tripodal 8-hydroxyquinoline based ligand (QH3) and its gadolinium(III) tris-chelated (GdQ) complex with hemicage structure was investigated by using high resolution Fourier-transform ion cyclotron resonance mass spectrometry (FTICRMS). The protonated adduct of the free ligand and its hemicage tripodal Gd(III) complex, [GdQ + H](+), were first observed in experiments of electrospray ionization (ESI) with a linear ion trap (LTQ) mass spectrometer and further investigated by using high resolution FTICRMS. Gas-phase dissociation of the protonated Gd(III) complex, by infrared multiphoton dissociation (IRMPD) FTICR MS, demonstrated a fragmentation pattern with six main product cluster ions labeled as [Fn](+) (n = 1 up to 6). These product ions suggest the elimination of 7-amino-alkyl or 7-alkyl chains of the hemicage moiety. High resolution MS conditions allowed the elucidation of the fragmentation pattern and product ion structures along with the determination, among the isotopic pattern of Gd, of the chemical compositions of closely related species, which differ in terms of hydrogen content. Among the Gd six naturally stable isotopes, (158)Gd is the most abundant, and its peak within each cluster was used as a reference for distinguishing each product ions. Computational DFT investigations were applied to give support to some hypothesis of fragmentation pathways, which could not have been easily justified on the basis of the experimental work. Furthermore, computational studies suggested the coordination geometry of the protonated parent complex and the five- and four-coordinated complexes, which derive from its fragmentation. Furthermore, experimental and computational evidences were collected about the octet spin state of the parent compound.
Collapse
Affiliation(s)
- Margherita De Bonis
- LaMI, Dipartimento di Scienze, Università degli Studi della Basilicata, Potenza, Italy
| | | | | | | | | | | |
Collapse
|
18
|
Lewis DJ, Moretta F, Holloway AT, Pikramenou Z. Evaluation of quinoline as a remote sensitiser for red and near-infrared emissive lanthanide(III) ions in solution and the solid state. Dalton Trans 2013; 41:13138-46. [PMID: 23007687 DOI: 10.1039/c2dt31106b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In order to evaluate quinoline as a remote sensitiser, we have prepared a DTPA based ligand, H3L, bearing quinoline bisamide arms for the complexation of a range of lanthanide(III) ions to give the neutral complexes LnLwhere Ln(3+) = Y(3+), Eu(3+), Sm(3+), Tb(3+), Er(3+), Yb(3+), Nd(3+), Gd(3+). Detection of the phosphorescence signal exhibited by the GdLcomplex at 77 K confirmed that the triplet energy level of the sensitiser at 21,190 cm(-1) was suitable for the indirect population of a range of lanthanide luminescent states. A full photophysical analysis of the complexes reveals that SmL and EuL display red emission when excited through the ligand-based absorption band centred at 330 nm, extending the excitation to violet light around 370 nm. We demonstrate that quinoline sensitizes near-infrared emission in the YbL, ErL and NdL complexes, in powder form as well as in solution. Most importantly, the luminescence for YbL and NdL was sufficiently efficient to be detected in non-deuterated solvent.
Collapse
Affiliation(s)
- David J Lewis
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, UK
| | | | | | | |
Collapse
|
19
|
Boros E, Polasek M, Zhang Z, Caravan P. Gd(DOTAla): a single amino acid Gd-complex as a modular tool for high relaxivity MR contrast agent development. J Am Chem Soc 2012; 134:19858-68. [PMID: 23157602 DOI: 10.1021/ja309187m] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
MR imaging at high magnetic fields benefits from an increased signal-to-noise ratio; however T(1)-based MR contrast agents show decreasing relaxivity (r(1)) at higher fields. High field, high relaxivity contrast agents can be designed by carefully controlling the rotational dynamics of the molecule. To this end, we investigated applications of the alanine analogue of Gd(DOTA), Gd(DOTAla). Fmoc-protected DOTAla suitable for solid phase peptide synthesis was synthesized and integrated into polypeptide structures. Gd(III) coordination results in very rigid attachment of the metal chelate to the peptide backbone through both the amino acid side chain and coordination of the amide carbonyl. Linear and cyclic monomers (GdL1, GdC1), dimers (Gd(2)L2, Gd(2)C2), and trimers (Gd(3)L3, Gd(3)C3) were prepared and relaxivities were determined at different field strengths ranging from 0.47 to 11.7 T. Amide carbonyl coordination was indirectly confirmed by determination of the hydration number q for the EuL1 integrated into a peptide backbone, q = 0.96 ± 0.09. The water residency time of GdL1 at 37 °C was optimal for relaxivity, τ(M) = 17 ± 2 ns. Increased molecular size leads to increased per Gd relaxivity (from r(1) = 7.5 for GdL1 to 12.9 mM(-1) s(-1) for Gd(3)L3 at 1.4 T, 37 °C). The cyclic, multimeric derivatives exhibited slightly higher relaxivities than the corresponding linearized multimers (Gd(2)C2: r(1) = 10.5 mM(-1) s(-1) versus Gd(2)C2-red r(1) = 9 mM(-1) s(-1) at 1.4 T, 37 °C). Overall, all six synthesized Gd complexes had higher relaxivities at low, intermediate, and high fields than the clinically used small molecule contrast agent [Gd(HP-DO3A)(H(2)O)].
Collapse
Affiliation(s)
- Eszter Boros
- The Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 149 Thirteenth Street, Suite 2301, Charlestown, Massachusetts 02129, United States
| | | | | | | |
Collapse
|
20
|
Andolina CM, Klemm PJ, Floyd WC, Fréchet JMJ, Raymond KN. Analysis of Lanthanide Complex Dendrimer Conjugates for Bimodal NIR and MRI Imaging. Macromolecules 2012; 45:8982-8990. [PMID: 23226878 DOI: 10.1021/ma302206g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Advances in clinical diagnostic instrumentation have enabled some imaging modalities to be run concurrently. For diagnostic purposes, multimodal imaging can allow for rapid location and accurate identification of a patient's illness. The paramagnetic and near Infra-red (NIR) properties of Dy(III) and Yb(III) are interesting candidates for the development of bimodal NIR and magnetic resonance imaging (MRI) contrast agents. To enhance their intrinsic bimodal properties, these lanthanides were chelated using the hexadentate-all-oxygen-donor-ligand TREN-bis-(1-Me)-3,2-HOPO-TAM-NX (NX, where X = 1, 2 or 3) and subsequently conjugated to the esteramide dendrimer (EA), to improve bioavailability, solubility, and relaxivity. Of these new complexes synthesized and evaluated, DyN1-EA had the largest ionic T(1) relaxivity, 7.60 mM(-1) s(-1), while YbN3-EA had the largest ionic T(2) relaxivity with a NIR quantum yield of 0.17 % when evaluated in mouse serum. This is the first Yb(III) bimodal NIR/T(2) MRI contrast agent of its kind evaluated.
Collapse
Affiliation(s)
- Christopher M Andolina
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | | | | | | | | |
Collapse
|
21
|
Roca-Sabio A, Bonnet CS, Mato-Iglesias M, Esteban-Gómez D, Tóth É, Blas AD, Rodríguez-Blas T, Platas-Iglesias C. Lanthanide Complexes Based on a Diazapyridinophane Platform Containing Picolinate Pendants. Inorg Chem 2012; 51:10893-903. [DOI: 10.1021/ic301369z] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Adrián Roca-Sabio
- Departamento de
Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira,
Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Célia S. Bonnet
- Centre de Biophysique
Moléculaire, CNRS,
rue Charles-Sadron, 45071 Orléans, Cedex 2, France
| | - Marta Mato-Iglesias
- Departamento de
Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira,
Rúa da Fraga 10, 15008 A Coruña, Spain
| | - David Esteban-Gómez
- Departamento de
Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira,
Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Éva Tóth
- Centre de Biophysique
Moléculaire, CNRS,
rue Charles-Sadron, 45071 Orléans, Cedex 2, France
| | - Andrés de Blas
- Departamento de
Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira,
Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Teresa Rodríguez-Blas
- Departamento de
Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira,
Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Carlos Platas-Iglesias
- Departamento de
Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira,
Rúa da Fraga 10, 15008 A Coruña, Spain
| |
Collapse
|
22
|
Deslandes S, Galaup C, Poole R, Mestre-Voegtlé B, Soldevila S, Leygue N, Bazin H, Lamarque L, Picard C. Synthesis and optical properties of macrocyclic lanthanide(III) chelates as new reagents for luminescent biolabeling. Org Biomol Chem 2012; 10:8509-23. [PMID: 23011114 DOI: 10.1039/c2ob26311d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The convenient and efficient synthesis of two macrocyclic ligands (15- and 18-membered) based on a dipyrido-6,7,8,9-tetrahydrophenazine (dpqc) or 2,2':6',2''-terpyridine (tpy) heterocycle and a DTTA (diethylenetriaminetriacetic acid) skeleton is described. In these ligands the DTTA skeleton contains an additional extracyclic functionality (NH(2) group) suitable for covalent attachment to bioactive molecules. These octa- and nonadentate ligands form very stable and luminescent neutral lanthanide complexes in aqueous solutions at physiological pH. The corresponding Eu(III) and Tb(III) complexes are characterized by a maximum absorption wavelength compatible with nitrogen laser excitation (337 nm) and attractive lifetimes and quantum yields. Further introduction of a maleimide bioconjugatable handle in the Eu(III) complexes was investigated and a valuable luminescence brightness above 1500 dm(3) mol(-1) cm(-1) at 337 nm was obtained with the corresponding Eu(III) tpy-derivative. Finally, these two luminescent chelates were grafted onto thiol residues of a model antibody (Mab GSS11) without loss of their luminescent properties.
Collapse
|
23
|
Pinho SLC, Faneca H, Geraldes CFGC, Rocha J, Carlos LD, Delville MH. Silica Nanoparticles for Bimodal MRI-Optical Imaging by Grafting Gd3+ and Eu3+/Tb3+ Complexes. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101110] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
24
|
Nonat AM, Gateau C, Fries PH, Helm L, Mazzanti M. New Bisaqua Picolinate-Based Gadolinium Complexes as MRI Contrast Agents with Substantial High-Field Relaxivities. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101162] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
25
|
Caillé F, Bonnet CS, Buron F, Villette S, Helm L, Petoud S, Suzenet F, Tóth E. Isoquinoline-based lanthanide complexes: bright NIR optical probes and efficient MRI agents. Inorg Chem 2012; 51:2522-32. [PMID: 22233349 DOI: 10.1021/ic202446e] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the objective of developing ligands that simultaneously satisfy the requirements for MRI contrast agents and near-infrared emitting optical probes that are suitable for imaging, three isoquinoline-based polyaminocarboxylate ligands, L1, L2 and L3, have been synthesized and the corresponding Gd(3+), Nd(3+) and Yb(3+) complexes investigated. The specific challenge of the present work was to create NIR emitting agents which (i) have excitation wavelengths compatible with biological applications and (ii) are able to emit a sufficient number of photons to ensure sensitive NIR detection for microscopic imaging. Here we report the first observation of a NIR signal arising from a Ln(3+) complex in aqueous solution in a microscopy setup. The lanthanide complexes have high thermodynamic stability (log K(LnL) =17.7-18.7) and good selectivity for lanthanide ions versus the endogenous cations Zn(2+), Cu(2+), and Ca(2+) thus preventing transmetalation. A variable temperature and pressure (17)O NMR study combined with nuclear magnetic relaxation dispersion measurements yielded the microscopic parameters characterizing water exchange and rotation. Bishydration of the lanthanide cation in the complexes, an important advantage to obtain high relaxivity for the Gd(3+) chelates, has been demonstrated by (17)O chemical shifts for the Gd(3+) complexes and by luminescence lifetime measurements for the Yb(3+) analogues. The water exchange on the three Gd(3+) complexes is considerably faster (k(ex)(298) = (13.9-15.4) × 10(6) s(-1)) than on commercial Gd(3+)-based contrast agents and proceeds via a dissociative mechanism, as evidenced by the large positive activation volumes for GdL1 and GdL2 (+10.3 ± 0.9 and +10.6 ± 0.9 cm(3) mol(-1), respectively). The relaxivity of GdL1 is doubled at 40 MHz and 298 K in fetal bovine serum (r(1) = 16.1 vs 8.5 mM(-1) s(-1) in HEPES buffer), due to hydrophobic interactions between the chelate and serum proteins. The isoquinoline core allows for the optimization of the optical properties of the luminescent lanthanide complexes in comparison to the pyridinic analogues and provides significant shifts of the excitation energies toward lower values which therefore become more adapted for biological applications. L2 and L3 bear two methoxy substituents on the aromatic core in ortho and para positions, respectively, that further modulate their electronic structure. The Nd(3+) and Yb(3+) complexes of the ligand L3, which incorporates the p-dimethoxyisoquinoline moiety, can be excited up to 420 nm. This wavelength is shifted over 100 nm toward lower energy in comparison to the pyridine-based analogue. The luminescence quantum yields of the Nd(3+) (0.013-0.016%) and Yb(3+) chelates (0.028-0.040%) are in the range of the best nonhydrated complexes, despite the presence of two inner sphere water molecules. More importantly, the 980 nm NIR emission band of YbL3 was detected with a good sensitivity in a proof of concept microscopy experiment at a concentration of 10 μM in fetal bovine serum. Our results demonstrate that even bishydrated NIR lanthanide complexes can emit a sufficient number of photons to ensure sensitive detection in practical applications. In particular, these ligands containing an aromatic core with coordinating pyridine nitrogen can be easily modified to tune the optical properties of the NIR luminescent lanthanide complexes while retaining good complex stability and MRI characteristics for the Gd(3+) analogues. They constitute a highly versatile platform for the development of bimodal MR and optical imaging probes based on a simple mixture of Gd(3+) and Yb(3+)/Nd(3+) complexes using an identical chelator. Given the presence of two inner sphere water molecules, important for MRI applications of the corresponding Gd(3+) analogues, this result is particularly exciting and opens wide perspectives not only for NIR imaging based on Ln(3+) ions but also for the design of combined NIR optical and MRI probes.
Collapse
Affiliation(s)
- Fabien Caillé
- Centre de Biophysique Moléculaire, UPR 4301 CNRS, rue Charles Sadron, 45071 Orléans, France
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Bonnet CS, Buron F, Caillé F, Shade CM, Drahoš B, Pellegatti L, Zhang J, Villette S, Helm L, Pichon C, Suzenet F, Petoud S, Tóth É. Pyridine-Based Lanthanide Complexes Combining MRI and NIR Luminescence Activities. Chemistry 2011; 18:1419-31. [DOI: 10.1002/chem.201102310] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Indexed: 11/07/2022]
|
27
|
Pinho SLC, Faneca H, Geraldes CFGC, Delville MH, Carlos LD, Rocha J. Lanthanide-DTPA grafted silica nanoparticles as bimodal-imaging contrast agents. Biomaterials 2011; 33:925-35. [PMID: 22035824 DOI: 10.1016/j.biomaterials.2011.09.086] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Accepted: 09/23/2011] [Indexed: 01/09/2023]
Abstract
The design and synthesis of a combined MRI-optical probe for bio-imaging are reported. The materials studied join the properties of lanthanide (Ln(3+)) complexes and nanoparticles (NPs), offering an excellent solution for bimodal imaging. The hybrid SiO(2)@APS/DTPA:Gd:Ln (Ln = Eu(3+) or Tb(3+)) (APS: 3-aminopropyltriethoxysilane, DTPA: diethylenetriamine pentaacetic acid) system increases the payload of the active magnetic centre (Gd(3+)) and introduces a Ln(3+) long-life excited state (Eu(3+): 0.35 ± 0.02 ms, Tb(3+): 1.87 ± 0.02 ms), with resistance to photobleaching and sharp emission bands. The Eu(3+) ions reside in a single low-symmetry site. Although the photoluminescence emission is not influenced by the simultaneous presence of Gd(3+) and Eu(3+), a moderate r(1) increase and a larger enhancement of r(2) are observed, particularly at high fields, due to susceptibility effects on r(2). The presence of Tb(3+) instead of Eu(3+) further raises r(1) but decreases r(2). These values are constant over a wide (5-13) pH range, indicating the paramagnetic NPs stability and absence of leaching. The uptake of NPs by living cells is fast and results in an intensity increase in the T(1)-weighted MRI images. The optical properties of the NPs in cellular pellets are also studied, confirming their potential as bimodal imaging agents.
Collapse
Affiliation(s)
- Sonia L C Pinho
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
| | | | | | | | | | | |
Collapse
|
28
|
Lemonnier JF, Guénée L, Beuchat C, Wesolowski TA, Mukherjee P, Waldeck DH, Gogick KA, Petoud S, Piguet C. Optimizing sensitization processes in dinuclear luminescent lanthanide oligomers: selection of rigid aromatic spacers. J Am Chem Soc 2011; 133:16219-34. [PMID: 21882836 DOI: 10.1021/ja206806t] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This work illustrates a simple approach for optimizing the lanthanide luminescence in molecular dinuclear lanthanide complexes and identifies a particular multidentate europium complex as the best candidate for further incorporation into polymeric materials. The central phenyl ring in the bis-tridentate model ligands L3–L5, which are substituted with neutral (X = H, L3), electron-withdrawing (X = F, L4), or electron-donating (X = OCH3, L5) groups, separates the 2,6-bis(benzimidazol-2-yl)pyridine binding units of linear oligomeric multi-tridentate ligand strands that are designed for the complexation of luminescent trivalent lanthanides, Ln(III). Reactions of L3–L5 with [Ln(hfac)3(diglyme)] (hfac– is the hexafluoroacetylacetonate anion) produce saturated single-stranded dumbbell-shaped complexes [Ln2(Lk)(hfac)6] (k = 3–5), in which the lanthanide ions of the two nine-coordinate neutral [N3Ln(hfac)3] units are separated by 12–14 Å. The thermodynamic affinities of [Ln(hfac)3] for the tridentate binding sites in L3–L5 are average (6.6 ≤ log(β(2,1)(Y,Lk)) ≤ 8.4) but still result in 15–30% dissociation at millimolar concentrations in acetonitrile. In addition to the empirical solubility trend found in organic solvents (L4 > L3 >> L5), which suggests that the 1,4-difluorophenyl spacer in L4 is preferable, we have developed a novel tool for deciphering the photophysical sensitization processes operating in [Eu2(Lk)(hfac)6]. A simple interpretation of the complete set of rate constants characterizing the energy migration mechanisms provides straightforward objective criteria for the selection of [Eu2(L4)(hfac)6] as the most promising building block.
Collapse
Affiliation(s)
- Jean-François Lemonnier
- Department of Inorganic, Analytical and Applied Chemistry, University of Geneva, 30 quai E. Ansermet, CH-1211 Geneva 4, Switzerland
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Tallec G, Fries PH, Imbert D, Mazzanti M. High Relaxivity and Stability of a Hydroxyquinolinate-Based Tripodal Monoaquagadolinium Complex for Use as a Bimodal MRI/Optical Imaging Agent. Inorg Chem 2011; 50:7943-5. [DOI: 10.1021/ic2012793] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Gaylord Tallec
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, SCIB, UMR-E 3 CEA / UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - Pascal H. Fries
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, SCIB, UMR-E 3 CEA / UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - Daniel Imbert
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, SCIB, UMR-E 3 CEA / UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - Marinella Mazzanti
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, SCIB, UMR-E 3 CEA / UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| |
Collapse
|
30
|
Affiliation(s)
- Yuanjing Cui
- State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
- Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States
| | - Yanfeng Yue
- Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States
| | - Guodong Qian
- State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Banglin Chen
- Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States
| |
Collapse
|
31
|
Hamacek J, Besnard C, Penhouet T, Morgantini PY. Thermodynamics, Structure and Properties of Polynuclear Lanthanide Complexes with a Tripodal Ligand: Insight into their Self-Assembly. Chemistry 2011; 17:6753-64. [DOI: 10.1002/chem.201100173] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Indexed: 11/06/2022]
|
32
|
|
33
|
|