1
|
Keot N, Sarma M. Computational insight into a mechanistic overview of water exchange kinetics and thermodynamic stabilities of bis and tris-aquated complexes of lanthanides. RSC Adv 2023; 13:1516-1529. [PMID: 36688060 PMCID: PMC9816859 DOI: 10.1039/d2ra05810c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 12/08/2022] [Indexed: 01/09/2023] Open
Abstract
A thorough investigation of Ln3+ complexes with more than one inner-sphere water molecule is crucial for designing high relaxivity contrast agents (CAs) used in magnetic resonance imaging (MRI). This study accomplished a comparative stability analysis of two hexadentate (H3cbda and H3dpaa) and two heptadentate (H4peada and H3tpaa) ligands with Ln3+ ions. The higher stability of the hexadentate H3cbda and heptadentate H4peada ligands has been confirmed by the binding affinity and Gibbs free energy analysis in aqueous solution. In addition, energy decomposition analysis (EDA) reveals the higher binding affinity of the peada4- ligand than the cbda3- ligand towards Ln3+ ions due to the higher charge density of the peada4- ligand. Moreover, a mechanistic overview of water exchange kinetics has been carried out based on the strength of the metal-water bond. The strength of the metal-water bond follows the trend Gd-O47 (w) > Gd-O39 (w) > Gd-O36 (w) in the case of the tris-aquated [Gd(cbda)(H2O)3] and Gd-O43 (w) > Gd-O40 (w) for the bis-aquated [Gd(peada)(H2O)2]- complex, which was confirmed by bond length, electron density (ρ), and electron localization function (ELF) at the corresponding bond critical points. Our analysis also predicts that the activation energy barrier decreases with the decrease in bond strength; hence k ex increases. The 17O and 1H hyperfine coupling constant values of all the coordinated water molecules were different, calculated by using the second-order Douglas-Kroll-Hess (DKH2) approach. Furthermore, the ionic nature of the bonding in the metal-ligand (M-L) bond was confirmed by the Quantum Theory of Atoms-In-Molecules (QTAIM) and ELF along with energy decomposition analysis (EDA). We hope that the results can be used as a basis for the design of highly efficient Gd(iii)-based high relaxivity MRI contrast agents for medical applications.
Collapse
Affiliation(s)
- Niharika Keot
- Department of Chemistry, Indian Institute of Technology GuwahatiAssam781039India+91 361 2582318
| | - Manabendra Sarma
- Department of Chemistry, Indian Institute of Technology GuwahatiAssam781039India+91 361 2582318
| |
Collapse
|
2
|
Nehra K, Dalal A, Hooda A, Kumar Saini R, Singh D, Kumar S. Synthesis and Photoluminescence Characterization of the Complexes of Samarium Dibenzoylmethanates with 1,10-Phenanthroline Derivatives. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115730] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
3
|
Machata M, Herchel R, Nemec I, Trávníček Z. Crystal structures and magnetic properties of two series of phenoxo-O bridged dinuclear Ln2 (Ln = Gd, Tb, Dy) complexes. Dalton Trans 2017; 46:16294-16305. [DOI: 10.1039/c7dt03441e] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Different solvent molecules as ligands in the molecular structures of the dinuclear Ln(iii) Schiff base complexes (Ln = Gd, Tb, and Dy) influenced the magnetic properties of the Dy(iii) derivatives.
Collapse
Affiliation(s)
- Marek Machata
- Department of Inorganic Chemistry
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University
- CZ-771 46 Olomouc
| | - Radovan Herchel
- Department of Inorganic Chemistry
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University
- CZ-771 46 Olomouc
| | - Ivan Nemec
- Department of Inorganic Chemistry
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University
- CZ-771 46 Olomouc
| | - Zdeněk Trávníček
- Department of Inorganic Chemistry
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University
- CZ-771 46 Olomouc
| |
Collapse
|
4
|
Wales DJ, Kitchen JA. Surface-based molecular self-assembly: Langmuir-Blodgett films of amphiphilic Ln(III) complexes. Chem Cent J 2016; 10:72. [PMID: 27994637 PMCID: PMC5125037 DOI: 10.1186/s13065-016-0224-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 11/23/2016] [Indexed: 12/23/2022] Open
Abstract
The unique photophysical properties of the Ln(III) series has led to significant research efforts being directed towards their application in sensors. However, for “real-life” applications, these sensors should ideally be immobilised onto surfaces without loss of function. The Langmuir-Blodgett (LB) technique offers a promising method in which to achieve such immobilisation. This mini-review focuses on synthetic strategies for film formation, the effect that film formation has on the physical properties of the Ln(III) amphiphile, and concludes with examples of Ln(III) LB films being used as sensors.
Collapse
Affiliation(s)
- Dominic J Wales
- Chemistry, University of Southampton, Southampton, Hampshire SO17 1BJ UK
| | - Jonathan A Kitchen
- Chemistry, University of Southampton, Southampton, Hampshire SO17 1BJ UK
| |
Collapse
|
5
|
Hassanzadeh R, lotfi A, Bagheri N, Hassanzadeh J. Ultrasensitive and Rapid Determination of Folic Acid Using Ag Nanoparticles Enhanced 1, 10-Phenantroline-Terbium (III) Sensitized Fluorescence. J Fluoresc 2016; 26:1875-83. [DOI: 10.1007/s10895-016-1882-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 07/12/2016] [Indexed: 12/28/2022]
|
6
|
Janzen DE, Juchum M, Presow SR, Ronson TK, Mohr W, Clérac R, Feltham HL, Brooker S. Trigonal (-3) symmetry octahedral lanthanide(III) complexes of zwitterionic tripodal ligands: luminescence and magnetism. Supramol Chem 2016. [DOI: 10.1080/10610278.2015.1102264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Daron E. Janzen
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
- Department of Chemistry and Biochemistry, St. Catherine University, St. Paul, MN, USA
| | - Michael Juchum
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - Shaun R. Presow
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - Tanya K. Ronson
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - Wolfgang Mohr
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - Rodolphe Clérac
- CNRS, CRPP, UPR 8641, Pessac, France
- Univ. Bordeaux, CRPP, UPR 8641, Pessac, France
| | - Humphrey L.C. Feltham
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - Sally Brooker
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| |
Collapse
|
7
|
Sukhikh TS, Bashirov DA, Kuratieva NV, Smolentsev AI, Bogomyakov AS, Burilov VA, Mustafina AR, Zibarev AV, Konchenko SN. New NIR-emissive tetranuclear Er(iii) complexes with 4-hydroxo-2,1,3-benzothiadiazolate and dibenzoylmethanide ligands: synthesis and characterization. Dalton Trans 2015; 44:5727-34. [DOI: 10.1039/c4dt03878a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new Er complexes were prepared and studied.
Collapse
Affiliation(s)
- Taisiya S. Sukhikh
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch
- Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | - Denis A. Bashirov
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch
- Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | - Natalia V. Kuratieva
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch
- Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | - Anton I. Smolentsev
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch
- Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | - Artem S. Bogomyakov
- International Tomography Center
- Siberian Branch
- Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | | | - Asia R. Mustafina
- Arbuzov Institute of Organic and Physical Chemistry
- Russian Academy of Sciences
- 420088 Kazan
- Russia
| | - Andrey V. Zibarev
- Vorozhtsov Institute of Organic Chemistry
- Siberian Branch
- Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | - Sergey N. Konchenko
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch
- Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| |
Collapse
|
8
|
Chen FF, Wei HB, Bian ZQ, Liu ZW, Ma E, Chen ZN, Huang CH. Sensitized Near-Infrared Emission from IrIII-LnIII (Ln = Nd, Yb, Er) Bimetallic Complexes with a (N∧O)(N∧O) Bridging Ligand. Organometallics 2014. [DOI: 10.1021/om401110k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fang-Fang Chen
- Beijing National Laboratory for
Molecular Sciences,
State Key Laboratory of Rare Earth Materials Chemistry and Applications,
College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, People’s Republic of China
- National Engineering Laboratory
for Hydrometallurgical
Cleaner Production Technology, Key Laboratory of Green Process and
Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Hui-Bo Wei
- Beijing National Laboratory for
Molecular Sciences,
State Key Laboratory of Rare Earth Materials Chemistry and Applications,
College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, People’s Republic of China
| | - Zu-Qiang Bian
- Beijing National Laboratory for
Molecular Sciences,
State Key Laboratory of Rare Earth Materials Chemistry and Applications,
College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, People’s Republic of China
| | - Zhi-Wei Liu
- Beijing National Laboratory for
Molecular Sciences,
State Key Laboratory of Rare Earth Materials Chemistry and Applications,
College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, People’s Republic of China
| | - En Ma
- State Key Laboratory of Structural
Chemistry,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People’s Republic of China
| | - Zhong-Ning Chen
- State Key Laboratory of Structural
Chemistry,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People’s Republic of China
| | - Chun-Hui Huang
- Beijing National Laboratory for
Molecular Sciences,
State Key Laboratory of Rare Earth Materials Chemistry and Applications,
College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, People’s Republic of China
| |
Collapse
|
9
|
Palmer AJ, Ford SH, Butler SJ, Hawkins TJ, Hussey PJ, Pal R, Walton JW, Parker D. Emissive europium complexes that stain the cell walls of healthy plant cells, pollen tubes and roots. RSC Adv 2014. [DOI: 10.1039/c3ra45426f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
10
|
Pointillart F, Le Guennic B, Cauchy T, Golhen S, Cador O, Maury O, Ouahab L. A Series of Tetrathiafulvalene-Based Lanthanide Complexes Displaying Either Single Molecule Magnet or Luminescence—Direct Magnetic and Photo-Physical Correlations in the Ytterbium Analogue. Inorg Chem 2013; 52:5978-90. [DOI: 10.1021/ic400253m] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabrice Pointillart
- Organométalliques: Matériaux
et Catalyse, UMR 6226 CNRS-UR1 Institut des Sciences Chimiques de
Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| | - Boris Le Guennic
- Organométalliques: Matériaux
et Catalyse, UMR 6226 CNRS-UR1 Institut des Sciences Chimiques de
Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| | - Thomas Cauchy
- Laboratoire MOLTECH-Anjou, Université
d’Angers CNRS-UMR 6200, 2 Bd Lavoisier 49045 Angers, France
| | - Stéphane Golhen
- Organométalliques: Matériaux
et Catalyse, UMR 6226 CNRS-UR1 Institut des Sciences Chimiques de
Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| | - Olivier Cador
- Organométalliques: Matériaux
et Catalyse, UMR 6226 CNRS-UR1 Institut des Sciences Chimiques de
Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| | - Olivier Maury
- Laboratoire de Chimie de l’ENS-Lyon-UMR
5182 CNRS−ENS Lyon−Université de Lyon 1, 46 Allée
d’Italie, 69364 Lyon Cedex 07, France
| | - Lahcène Ouahab
- Organométalliques: Matériaux
et Catalyse, UMR 6226 CNRS-UR1 Institut des Sciences Chimiques de
Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| |
Collapse
|
11
|
Pointillart F, Guennic BL, Maury O, Golhen S, Cador O, Ouahab L. Lanthanide Dinuclear Complexes Involving Tetrathiafulvalene-3-pyridine-N-oxide Ligand: Semiconductor Radical Salt, Magnetic, and Photophysical Studies. Inorg Chem 2013; 52:1398-408. [DOI: 10.1021/ic302095h] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fabrice Pointillart
- Institut des Sciences Chimiques de
Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du
Général Leclerc, 35042 Rennes Cedex, France
| | - Boris Le Guennic
- Institut des Sciences Chimiques de
Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du
Général Leclerc, 35042 Rennes Cedex, France
| | - Olivier Maury
- Laboratoire de Chimie, UMR 5182 CNRS-ENS,
Lyon-Université Lyon 1, 46 Allée d’Italie, 69364
Lyon Cedex 07, France
| | - Stéphane Golhen
- Institut des Sciences Chimiques de
Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du
Général Leclerc, 35042 Rennes Cedex, France
| | - Olivier Cador
- Institut des Sciences Chimiques de
Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du
Général Leclerc, 35042 Rennes Cedex, France
| | - Lahcène Ouahab
- Institut des Sciences Chimiques de
Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du
Général Leclerc, 35042 Rennes Cedex, France
| |
Collapse
|
12
|
Mostofa KMG, Liu CQ, Feng X, Yoshioka T, Vione D, Pan X, Wu F. Complexation of Dissolved Organic Matter with Trace Metal Ions in Natural Waters. PHOTOBIOGEOCHEMISTRY OF ORGANIC MATTER 2013. [DOI: 10.1007/978-3-642-32223-5_9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
13
|
Gao T, Yang Y, Sun WB, Li GM, Hou GF, Yan PF, Li JT, Ding DD. Syntheses, structure and near-infrared (NIR) luminescence of Er2, Yb2, ErYb of homodinuclear and heterodinuclear lanthanide(iii) complexes based on salen ligand. CrystEngComm 2013. [DOI: 10.1039/c3ce40714d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
14
|
Cowan MG, Brooker S. Syntheses, structures and properties of structurally characterised complexes of imide-based ligands. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.06.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
15
|
Feng W, Zhang Y, Zhang Z, Lü X, Liu H, Shi G, Zou D, Song J, Fan D, Wong WK, Jones RA. Anion-Induced Self-Assembly of Luminescent and Magnetic Homoleptic Cyclic Tetranuclear Ln4(Salen)4 and Ln4(Salen)2 Complexes (Ln = Nd, Yb, Er, or Gd). Inorg Chem 2012; 51:11377-86. [DOI: 10.1021/ic300918c] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Weixu Feng
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Yao Zhang
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Zhao Zhang
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Xingqiang Lü
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
- Fujian Institute
of Research
on the Structure of Matter, Chinese Academy of Science, Fuzhou 350002, Fujian, China
| | - Han Liu
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Guoxiang Shi
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Dan Zou
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Jirong Song
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Daidi Fan
- Shaanxi Key Laboratory
of Degradable
Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi’an 710069, Shaanxi,
China
| | - Wai-Kwok Wong
- Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon
Tong, Hong Kong, China
| | - Richard A. Jones
- Department of Chemistry and
Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, United States
| |
Collapse
|
16
|
|
17
|
Molloy JK, Kotova O, Peacock RD, Gunnlaugsson T. Synthesis of luminescent homo-dinuclear cationic lanthanide cyclen complexes bearing amide pendant arms through the use of copper catalysed (1,3-Huisgen, CuAAC) click chemistry. Org Biomol Chem 2012; 10:314-22. [DOI: 10.1039/c1ob06203d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
18
|
Wang Q, Tang K, Jin X, Huang X, Liu W, Yao X, Tang Y. Lanthanide complexes assembled from two flexible amide-type tripodal ligands: terminal groups effect on photoluminescence behavior. Dalton Trans 2012; 41:3431-8. [DOI: 10.1039/c2dt11761d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
19
|
Kotova O, Comby S, Gunnlaugsson T. Sensing of biologically relevant d-metal ions using a Eu(iii)-cyclen based luminescent displacement assay in aqueous pH 7.4 buffered solution. Chem Commun (Camb) 2011; 47:6810-2. [DOI: 10.1039/c1cc11810b] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
20
|
Lincheneau C, Peacock RD, Gunnlaugsson T. Europium directed synthesis of enantiomerically pure dimetallic luminescent "squeezed" triple-stranded helicates; solution studies. Chem Asian J 2010; 5:500-4. [PMID: 20143373 DOI: 10.1002/asia.200900515] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Christophe Lincheneau
- School of Chemistry, Center for Synthesis and Chemical Biology, University of Dublin, Trinity College Dublin, Dublin 2, Ireland
| | | | | |
Collapse
|
21
|
Nonat AM, Allain C, Faulkner S, Gunnlaugsson T. Mixed d−f3 Coordination Complexes Possessing Improved Near-Infrared (NIR) Lanthanide Luminescent Properties in Aqueous Solution. Inorg Chem 2010; 49:8449-56. [DOI: 10.1021/ic1010852] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Aline M. Nonat
- School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland
| | - Clémence Allain
- University of Oxford, Chemistry Research Laboratories, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Stephen Faulkner
- University of Oxford, Chemistry Research Laboratories, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Thorfinnur Gunnlaugsson
- School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland
| |
Collapse
|
22
|
Jańczewski D, Zhang Y, Das GK, Yi DK, Padmanabhan P, Bhakoo KK, Tan TTY, Selvan ST. Bimodal magnetic-fluorescent probes for bioimaging. Microsc Res Tech 2010; 74:563-76. [PMID: 20734412 DOI: 10.1002/jemt.20912] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Accepted: 06/24/2010] [Indexed: 12/17/2022]
Abstract
Fluorescent optical probes have been intensively used in the area of bio-imaging. In this review article, we describe the recent advancements in the synthesis and application of bimodal magnetic-fluorescent probes for bioimaging. The bimodal probes consist of fluorescent [semiconducting quantum dots (e.g., CdSe/ZnS) or rare-earth doped (e.g., NaYF(4) :Yb,Er)] nanoparticles (NPs) and magnetic (iron oxide or gadolinium based) NPs for optical and magnetic resonance (MR) imaging.
Collapse
Affiliation(s)
- Dominik Jańczewski
- Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
| | | | | | | | | | | | | | | |
Collapse
|
23
|
|
24
|
Chen XY, Yang X, Holliday BJ. Metal-Controlled Assembly of Near-Infrared-Emitting Pentanuclear Lanthanide β-Diketone Clusters. Inorg Chem 2010; 49:2583-5. [DOI: 10.1021/ic902513z] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiao-Yan Chen
- Department of Chemistry and Biochemistry and Center for Nano and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165
| | - Xiaoping Yang
- Department of Chemistry and Biochemistry and Center for Nano and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165
| | - Bradley J. Holliday
- Department of Chemistry and Biochemistry and Center for Nano and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165
| |
Collapse
|
25
|
Plush SE, Clear NA, Leonard JP, Fanning AM, Gunnlaugsson T. The effect on the lanthanide luminescence of structurally simple Eu(iii) cyclen complexes upon deprotonation of metal bound water molecules and amide based pendant arms. Dalton Trans 2010; 39:3644-52. [DOI: 10.1039/b923383k] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Lippert AR, Gschneidtner T, Chang CJ. Lanthanide-based luminescent probes for selective time-gated detection of hydrogen peroxide in water and in living cells. Chem Commun (Camb) 2010; 46:7510-2. [DOI: 10.1039/c0cc01560a] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
27
|
McMahon B, Mauer P, McCoy CP, Lee TC, Gunnlaugsson T. Selective Imaging of Damaged Bone Structure (Microcracks) Using a Targeting Supramolecular Eu(III) Complex As a Lanthanide Luminescent Contrast Agent. J Am Chem Soc 2009; 131:17542-3. [PMID: 19916488 DOI: 10.1021/ja908006r] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brian McMahon
- School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland, Department of Anatomy, Royal College of Surgeons in Ireland, St. Stephen’s Green, Dublin 2, Ireland, and School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast, BT9 7BL U.K
| | - Peter Mauer
- School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland, Department of Anatomy, Royal College of Surgeons in Ireland, St. Stephen’s Green, Dublin 2, Ireland, and School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast, BT9 7BL U.K
| | - Colin P. McCoy
- School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland, Department of Anatomy, Royal College of Surgeons in Ireland, St. Stephen’s Green, Dublin 2, Ireland, and School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast, BT9 7BL U.K
| | - T. Clive Lee
- School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland, Department of Anatomy, Royal College of Surgeons in Ireland, St. Stephen’s Green, Dublin 2, Ireland, and School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast, BT9 7BL U.K
| | - Thorfinnur Gunnlaugsson
- School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland, Department of Anatomy, Royal College of Surgeons in Ireland, St. Stephen’s Green, Dublin 2, Ireland, and School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast, BT9 7BL U.K
| |
Collapse
|
28
|
Li D, Chen FF, Bian ZQ, Liu ZW, Zhao YL, Huang CH. Sensitized near-infrared emission of YbIII from an IrIII–YbIII bimetallic complex. Polyhedron 2009. [DOI: 10.1016/j.poly.2008.12.043] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
29
|
|
30
|
YAMAGUCHI Y, HASHINO K, ITO M, IKAWA K, NISHIOKA T, MATSUMOTO K. Sodium Dodecyl Sulfate Polyacrylamide Slab Gel Electrophoresis and Hydroxyethyl Cellurose Gel Capillary Electrophoresis of Luminescent Lanthanide Chelate-labeled Proteins with Time-Resolved Detection. ANAL SCI 2009; 25:327-32. [DOI: 10.2116/analsci.25.327] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yoshinori YAMAGUCHI
- Consolidated Research Institute for Advanced Science and Medical Care (ASMeW), Waseda University
| | - Kimikazu HASHINO
- Advanced Research Institute for Science and Engineering, Waseda University
- CREST, Japan Science and Technology Agency
| | - Masahiro ITO
- Department of Chemistry, School of Science and Engineering, Waseda University
| | - Keisuke IKAWA
- Department of Chemistry, School of Science and Engineering, Waseda University
| | - Takuya NISHIOKA
- Advanced Research Institute for Science and Engineering, Waseda University
- Department of Chemistry, School of Science and Engineering, Waseda University
| | - Kazuko MATSUMOTO
- CREST, Japan Science and Technology Agency
- Department of Chemistry, School of Science and Engineering, Waseda University
- Tokyo Chemical Industry Co., Ltd
| |
Collapse
|
31
|
Chen FF, Bian ZQ, Lou B, Ma E, Liu ZW, Nie DB, Chen ZQ, Bian J, Chen ZN, Huang CH. Sensitised near-infrared emission from lanthanides using an iridium complex as a ligand in heteronuclear Ir2Ln arrays. Dalton Trans 2008. [DOI: 10.1039/b810016k] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
32
|
Zheng XL, Liu Y, Pan M, Lü XQ, Zhang JY, Zhao CY, Tong YX, Su CY. Bright Blue-Emitting Ce3+ Complexes with Encapsulating Polybenzimidazole Tripodal Ligands as Potential Electroluminescent Devices. Angew Chem Int Ed Engl 2007; 46:7399-403. [PMID: 17696179 DOI: 10.1002/anie.200702401] [Citation(s) in RCA: 156] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiang-Li Zheng
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Zheng XL, Liu Y, Pan M, Lü XQ, Zhang JY, Zhao CY, Tong YX, Su CY. Bright Blue-Emitting Ce3+ Complexes with Encapsulating Polybenzimidazole Tripodal Ligands as Potential Electroluminescent Devices. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200702401] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
34
|
Lazarides T, Davies GM, Adams H, Sabatini C, Barigelletti F, Barbieri A, Pope SJA, Faulkner S, Ward MD. Ligand-field excited states of hexacyanochromate and hexacyanocobaltate as sensitisers for near-infrared luminescence from Nd(iii) and Yb(iii) in cyanide-bridged d-f assemblies. Photochem Photobiol Sci 2007; 6:1152-7. [PMID: 17973046 DOI: 10.1039/b708683k] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crystallisation of [Co(CN)(6)](3-) or [Cr(CN)(6)](3-) with Ln(iii) salts (Ln = Nd, Gd, Yb) from aqueous dmf afforded the cyanide-bridged d/f systems [Ln(dmf)(4)(H(2)O)(3)(micro-CN)Co(CN)(5)] (-, discrete dinuclear species) and {[Cr(CN)(4)(micro-CN)(2)Ln(H(2)O)(2)(dmf)(4)]}(infinity) (-, infinite cyanide-bridged chains with alternating Cr and Ln centres). With Ln = Gd the characteristic long-lived phosphorescence from d-d excited states of the [M(CN)(6)](3-) units was apparent in the red region of the spectrum, with lifetimes of the order of 1 micros, since the heavy atom effect of the Gd(iii) promotes inter-system crossing at the [M(CN)(6)](3-) units to generate the phosphorescent spin-forbidden excited states. With Ln = Yb or Nd however, the d-block luminescence was completely quenched due to fast (>10(8) s(-1)) energy-transfer to the Ln(iii) centre, resulting in the characteristic sensitised emission from Yb(iii) and Nd(iii) in the near-IR region. For both - and -, calculations based on spectroscopic overlap between emission of the donor (Co) and absorption of the acceptor (Ln) suggest that the Dexter energy-transfer mechanism is responsible for the complete quenching that we observe.
Collapse
|
35
|
Táborský P, Svobodová I, Lubal P, Hnatejko Z, Lis S, Hermann P. Formation and dissociation kinetics of Eu(III) complexes with H5do3ap and similar dota-like ligands. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.05.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
36
|
Ziessel R, Diring S, Kadjane P, Charbonnière L, Retailleau P, Philouze C. Highly Efficient Blue Photoexcitation of Europium in a Bimetallic Pt–Eu Complex. Chem Asian J 2007; 2:975-82. [PMID: 17600789 DOI: 10.1002/asia.200700143] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We report the preparation and characterization of dinuclear Pt-Ln complexes constructed from a square-planar Pt(II) core bearing an ethynyl-terpyridine residue connected to platinum by the ethynyl bond. Complexation of the neutral Eu(hfac)3 (hfac = hexafluoroacetylacetonate) fragment to free terpyridine (terpy) gives a stable bimetallic complex (log beta = 6.7). In the crystal structure, the flat Pt[triple bond]terpy core coordinates to Eu(III), which is nonacoordinated with the three nitrogen atoms of the terpy subunit and six oxygen atoms of the three hfac ligands. These atoms form a distorted monocapped square antiprism with a pseudo-C2 symmetry axis passing through the nitrogen atom of the central pyridine ring and the Eu atom. Spectroscopic measurements showed that irradiation with visible light of wavelength up to 460 nm in the 1MLCT state of the Pt subunit resulted in a quantitative energy transfer to the Eu center, which strongly luminesces in the red with an overall luminescence quantum yield of 38%. The energy-transfer process is quantitative and not sensitive to oxygen, and the complexation of Eu to the Pt metallosynthon allows the recovery of the energy lost due to triplet-oxygen quenching of the 3MLCT state observed in the uncomplexed Pt precursor.
Collapse
Affiliation(s)
- Raymond Ziessel
- Laboratoire de Chimie Moléculaire, ECPM, UMR 7509, CNRS-Université Louis Pasteur, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France.
| | | | | | | | | | | |
Collapse
|
37
|
Ward MD. Transition-metal sensitised near-infrared luminescence from lanthanides in d–f heteronuclear arrays. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2006.10.005] [Citation(s) in RCA: 343] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
38
|
A convenient synthesis of 6,6′-dimethyl-2,2′-bipyridine-4-ester and its application to the preparation of bifunctional lanthanide chelators. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.12.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
39
|
Ronson TK, Lazarides T, Adams H, Pope SJA, Sykes D, Faulkner S, Coles SJ, Hursthouse MB, Clegg W, Harrington RW, Ward MD. Luminescent Pt(II)(bipyridyl)(diacetylide) chromophores with pendant binding sites as energy donors for sensitised near-infrared emission from lanthanides: structures and photophysics of Pt(II)/Ln(III) assemblies. Chemistry 2007; 12:9299-313. [PMID: 16991190 DOI: 10.1002/chem.200600698] [Citation(s) in RCA: 132] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The complexes [Pt(bipy){CC-(4-pyridyl)}(2)] (1) and [Pt(tBu(2)bipy){CC-(4-pyridyl)}(2)] (2) and [Pt(tBu(2)-bipy)(CC-phen)(2)] (3) all contain a Pt(bipy)(diacetylide) core with pendant 4-pyridyl (1 and 2) or phenanthroline (3) units which can be coordinated to {Ln(diketonate)(3)} fragments (Ln = a lanthanide) to make covalently-linked Pt(II)/Ln(III) polynuclear assemblies in which the Pt(II) chromophore, absorbing in the visible region, can be used to sensitise near-infrared luminescence from the Ln(III) centres. For 1 and 2 one-dimensional coordination polymers [1Ln(tta)(3)](infinity) and [2Ln(hfac)(3)](infinity) are formed, whereas 3 forms trinuclear adducts [3{Ln(hfac)(3)}(2)] (tta=anion of thenoyl-trifluoroacetone; hfac=anion of hexafluoroacetylacetone). Complexes 1-3 show typical Pt(II)-based (3)MLCT luminescence in solution at approximately 510 nm, but in the coordination polymers [1Ln(tta)(3)](infinity) and [2Ln(hfac)(3)](infinity) the presence of stacked pairs of Pt(II) units with short PtPt distances means that the chromophores have (3)MMLCT character and emit at lower energy ( approximately 630 nm). Photophysical studies in solution and in the solid state show that the (3)MMLCT luminescence in [1Ln(tta)(3)](infinity) and [2Ln(hfac)(3)](infinity) in the solid state, and the (3)MLCT emission of [3{Ln(hfac)(3)}(2)] in solution and the solid state, is quenched by Pt-->Ln energy transfer when the lanthanide has low-energy f-f excited states which can act as energy acceptors (Ln=Yb, Nd, Er, Pr). This results in sensitised near-infrared luminescence from the Ln(III) units. The extent of quenching of the Pt(II)-based emission, and the Pt-->Ln energy-transfer rates, can vary over a wide range according to how effective each Ln(III) ion is at acting as an energy acceptor, with Yb(III) usually providing the least quenching (slowest Pt-->Ln energy transfer) and either Nd(III) or Er(III) providing the most (fastest Pt-->Ln energy transfer) according to which one has the best overlap of its f-f absorption manifold with the Pt(II)-based luminescence.
Collapse
Affiliation(s)
- Tanya K Ronson
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Ronson TK, Adams H, Harding LP, Pope SJA, Sykes D, Faulkner S, Ward MD. Polynuclear lanthanide complexes of a series of bridging ligands containing two tridentate N,N′,O-donor units: structures and luminescence properties. Dalton Trans 2007:1006-22. [PMID: 17325775 DOI: 10.1039/b618258e] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A set of three potentially bridging ligands containing two tridentate chelating N,N',O-donor (pyrazole-pyridine-amide) donors separated by an o, m, or p-phenylene spacer has been prepared and their coordination chemistry with lanthanide(III) ions investigated. Ligand L(1) (p-phenylene spacer) forms complexes with a 2:3 M:L ratio according to the proportions used in the reaction mixture; the Ln(2)(L(1))(3) complexes contain two 9-coordinate Ln(III) centres with all three bridging ligands spanning both metal ions, and have a cylindrical (non-helical) 'mesocate' architecture. The 1:1 complexes display a range of structural types depending on the conditions used, including a cyclic Ln(4)(L(1))(4) tetranuclear helicate, a Ln(2)(L(1))(2) dinuclear mesocate, and an infinite one-dimensional coordination polymer in which metal ions and bridging ligands alternate along the sequence. ESMS studies indicate that the 1:1 complexes form a mixture of oligonuclear species {Ln(L(1))}(n) in solution (n up to 5) which are likely to be cyclic helicates. In contrast, ligands L(2) and L(3) (with o- and m-phenylene spacers, respectively) generally form dinuclear Ln(2)L(2) Ln(III) complexes in which the two ligands may be arranged in a helical or non-helical architecture about the two metal ions. These complexes also contain an additional exogenous bidentate bridging ligand, either acetate or formate, which has arisen from hydrolysis of solvent molecules promoted by the Lewis-acidity of the Ln(III) ions. Luminescence studies on some of the Nd(III) complexes showed that excitation into ligand-centred pi-pi* transitions result in the characteristic near-infrared luminescence from Nd(III) at 1060 nm.
Collapse
Affiliation(s)
- Tanya K Ronson
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
| | | | | | | | | | | | | |
Collapse
|
41
|
Lazarides T, Alamiry MAH, Adams H, Pope SJA, Faulkner S, Weinstein JA, Ward MD. Anthracene as a sensitiser for near-infrared luminescence in complexes of Nd(iii), Er(iii) and Yb(iii): an unexpected sensitisation mechanism based on electron transfer. Dalton Trans 2007:1484-91. [PMID: 17404649 DOI: 10.1039/b700714k] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ligand L(1), which contains a chelating 2-(2-pyridyl)benzimidazole (PB) unit with a pendant anthacenyl group An connected via a methylene spacer, (L(1) = PB-An), was used to prepare the 8-coordinate lanthanide(III) complexes [Ln(hfac)(3)(L(1))] (Ln = Nd, Gd, Er, Yb) which have been structurally characterised and all have a square antiprismatic N(2)O(6) coordination geometry. Whereas free L(1) displays typical anthracene-based fluorescence, this fluorescence is completely quenched in its complexes. The An group in L(1) acts as an antenna unit: in the complexes [Ln(hfac)(3)(L(1))] (Ln = Nd, Er, Yb) selective excitation of the anthracene results in sensitised near-infrared luminescence from the lanthanide centres with concomitant quenching of An fluorescence. Surprisingly, the anthracene fluorescence is also quenched even in the Gd(III) complex and in its Zn(II) adduct in which quenching via energy transfer to the metal centre is not possible. It is proposed that the quenching of anthracene fluorescence in coordinated L(1) arises due to intra-ligand photoinduced electron-transfer from the excited anthracene chromophore (1)An* to the coordinated PB unit generating a short-lived charge-separated state [An(.+)-PB(.-)] which collapses by back electron-transfer to give (3)An*. This electron-transfer step is only possible upon coordination of L(1) to the metal centre, which strongly increases the electron acceptor capability of the PB unit, such that (1)An* --> PB PET is endoergonic in free L(1) but exergonic in its complexes. Thus, rather than a conventional set of steps ((1)An* -->(3)An* --> Ln), the sensitization mechanism now includes (1)An* --> PB photoinduced electron transfer to generate charge-separated [An(.+)-PB(.-)], then back electron-transfer to generate (3)An* which finally sensitises the Ln(III) centre via energy transfer. The presence of (3)An* in L(1) and its complexes is confirmed by nanosecond transient absorption studies, which have also shown that the (3)An* lifetime in the Nd(III) complex matches the rise time of Nd-centred near-infrared emission, confirming that the final step of the sequence is (3)An* --> Ln(III) energy-transfer.
Collapse
|
42
|
de Geest DJ, Noble A, Moubaraki B, Murray KS, Larsen DS, Brooker S. Dicopper(II) complexes of a new pyrazolate-containing Schiff-base macrocycle and related acyclic ligand. Dalton Trans 2006:467-75. [PMID: 17213932 DOI: 10.1039/b614637f] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dicopper(II) complexes of two new 3,5-disubstituted-pyrazole-based ligands, bis(quadridentate) macrocyclic ligand (L1)(2-) and bis(terdentate) acyclic ligand (L2)(-), were synthesised by Schiff base condensation of 3,5-diformylpyrazole and either one equivalent of 1,3-diaminopropane or two equivalents of 2-(2-aminoethyl)pyridine in the presence of one or two equivalents of copper(II) ions, respectively. Copper(II) acetate monohydrate was employed in the synthesis of [Cu(2)(L1)(OAc)(2)], [Cu(2)(L2)(H(2)O)(2)(OAc)(3)] and [Cu(II)(2)(L1)(NCS)(2)]; in the last of these one equivalent of NaNCS per copper(II) ion was also added. The fourth complex, [Cu(2)(L2)(NCS)(2)(DMF)]BF(4), was prepared using copper(II) tetrafluoroborate hexahydrate, along with two equivalents of NaOH and six of NaSCN. All four of these dimetallic complexes have been characterised by single crystal X-ray diffraction: the two macrocyclic complexes are the first such Schiff base complexes to be so characterised. A feature common to all four of the structures is bridging of the two copper(II) centres by the pyrazolate moiety/moieties. The structure determinations show that the coordination mode of the acetate groups in both [Cu(2)(L1)(OAc)(2)].2MeOH.H(2)O and [Cu(2)(L2)(H(2)O)(2)(OAc)(3)] is unidentate as had been tentatively predicted by analysis of the infrared spectra (DeltaOCO of 199 and 208 cm(-1), respectively). The magnetochemical studies of the macrocyclic complexes, over the temperature range 4-300 K, revealed strong antiferromagnetic coupling with J = -169 and -213 cm(-1) for [Cu(2)(L1)(OAc)(2)].2H(2)O and [Cu(II)(2)(L1)(NCS)(2)].DMF respectively. The J values have been discussed in relation to a published correlation involving the CuN(pyrazolate)N(pyrazolate) angles.
Collapse
Affiliation(s)
- Duncan J de Geest
- Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
| | | | | | | | | | | |
Collapse
|
43
|
Picard C, Geum N, Nasso I, Mestre B, Tisnès P, Laurent S, Muller RN, Elst LV. A dual lanthanide probe suitable for optical (Tb3+ luminescence) and magnetic resonance imaging (Gd3+ relaxometry). Bioorg Med Chem Lett 2006; 16:5309-12. [PMID: 16919942 DOI: 10.1016/j.bmcl.2006.07.091] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Revised: 07/28/2006] [Accepted: 07/31/2006] [Indexed: 12/01/2022]
Abstract
A new polyaminocarboxylate ligand derived from N,C-pyrazolylpyridine was synthesized. The luminescence and relaxometry properties of its Tb(3+) and Gd(3+) chelates were investigated in aqueous solutions. The Tb(3+) chelate is strongly luminescent having remarkable lifetime and quantum yield (tau=1.82ms and Phi=0.42). The 1/T(1) proton relaxivity at 20MHz and 25 degrees C (5.3s(-1)mM(-1)) of the Gd(3+) chelate was found to be comparable to that of the clinically used Gd-DTPA.
Collapse
Affiliation(s)
- Claude Picard
- Laboratoire de Synthèse et Physicochimie de Molécules d'Intérêt Biologique, CNRS UMR 5068, Université Paul Sabatier, 31062 Toulouse cedex 04, France.
| | | | | | | | | | | | | | | |
Collapse
|
44
|
Herrera JM, Pope SJA, Adams H, Faulkner S, Ward MD. Structural and Photophysical Properties of Coordination Networks Combining [Ru(Bpym)(CN)4]2- or [{Ru(CN)4}2(μ-bpym)]4- Anions (bpym = 2,2‘-Bipyrimidine) with Lanthanide(III) Cations: Sensitized Near-Infrared Luminescence from Yb(III), Nd(III), and Er(III) Following Ru-to-Lanthanide Energy Transfer. Inorg Chem 2006; 45:3895-904. [PMID: 16676948 DOI: 10.1021/ic0521574] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reaction of the cyanoruthenate anions [Ru(bpym)(CN)4]2- and [[Ru(CN)4]2(mu-bpym)]4- (bpym = 2,2'-bipyrimidine) with lanthanide(III) salts resulted in the crystallization of coordination networks based on Ru-CN-Ln bridges. Four types of structure were obtained: [Ru(bpym)(CN)4][Ln(NO3)(H2O)5] (Ru-Ln; Ln = Sm, Nd, and Gd) are one-dimensional helical chains; [Ru(bpym)(CN)4]2[Ln(NO3)(H2O)2][Ln(NO3)(0.5)(H2O)(5.5)](NO3)(0.5).5.5H2O (Ru-Ln; Ln = Er and Yb) are two-dimensional sheets containing cross-linked chains based on Ru2Ln2(mu-CN)4 diamond units, which are linked into one-dimensional chains via shared Ru atoms; [[Ru(CN)4]2(mu-bpym)][Ln(NO3)(H2O)5]2.3H2O (Ru2-Ln; Ln = Nd and Sm) are one-dimensional ladders with parallel Ln-NC-Ru-CN-Ln-NC strands connected by the bipyrimidine "cross pieces" acting as rungs on the ladder; and [[Ru(CN)4]2(mu-bpym)][Ln(H2O)6](0.5)[Ln(H2O)4](NO3)(0.5).nH2O (Ru2-Ln; Ln = Eu, Gd, and Yb; n = 8.5, 8.5, and 8, respectively) are three-dimensional networks in which two-dimensional sheets of Ru2Ln2(mu-CN)4 diamonds are connected via cyanide bridges to Ln(III) ions between the layers. Whereas Ru-Gd shows weak triplet metal-to-ligand charge-transfer (3MLCT) luminescence in the solid state from the Ru-bipyrimidine chromophore, in Ru-Nd, Ru-Er, and Ru-Yb, the Ru-based emission is quenched, and all of these show, instead, sensitized lanthanide-based near-IR luminescence following a Ru --> Ln energy transfer. Similarly, Ru2-Nd and Ru2-Yb show lanthanide-based near-IR emission following excitation of the Ru-bipyrimidine chromophore. Time-resolved luminescence measurements suggest that the Ru --> Ln energy-transfer rate is faster (when Ln = Yb and Er) than in related complexes based on the [Ru(bipy)(CN)4]2- chromophore, because the lower energy of the Ru-bpym 3MLCT provides better spectroscopic overlap with the low-energy f-f states of Yb(III) and Er(III). In every case, the lanthanide-based luminescence is relatively short-lived as a result of the CN oscillations in the lattice.
Collapse
Affiliation(s)
- Juan-Manuel Herrera
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
| | | | | | | | | |
Collapse
|