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Kotková Z, Koucký F, Kotek J, Císařová I, Parker D, Hermann P. Copper(II) complexes of cyclams with N-(2,2,2-trifluoroethyl)-aminoalkyl pendant arms as potential probes for 19F magnetic resonance imaging. Dalton Trans 2023; 52:1861-1875. [PMID: 36448539 DOI: 10.1039/d2dt03360g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of Cu(II) complexes with cyclam-based ligands containing two N-(2,2,2-trifluoroethyl)-aminoalkyl pendant arms in 1,8-positions (L1: 1,2-ethylene spacer, L2: 1,3-propylene spacer; L3: 1,4-butylene spacer) was studied in respect to potential use as contrast agents for 19F magnetic resonance imaging (MRI). A number of structures of the complexes as well as of several organic precursors were determined by single-crystal X-ray diffraction analysis. Geometric parameters (especially distances between fluorine atoms and the central metal ion) were determined for each complex and the identity of isomeric complex species present in solution was established. The NMR longitudinal relaxation times (T1) of 19F nuclei in the ligands at clinically relevant fields and temperatures (1-2 s) were significantly shortened upon Cu(II) binding to 7-10 ms for [Cu(L1)]2+, 20-30 ms for [Cu(L2)]2+ and 20-50 ms for [Cu(L3)]2+. The trend of the relaxation time shortening is in accordance with the distance and number of chemical bonds between fluorine atoms and the Cu(II) ion. The signals show promising T2*/T1 ratios in the range 0.25-0.55, assuring their good applicability to 19F NMR/MRI. The results show that even the Cu(II) ion, with a small magnetic moment, causes significant relaxation enhancement with a long-range effect and can be considered as a highly suitable metal ion for efficient 19F MRI contrast agents.
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Affiliation(s)
- Zuzana Kotková
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Filip Koucký
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - David Parker
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
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2
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AlHaddad N, Lelong E, Suh JM, Cordier M, Lim MH, Royal G, Platas-Iglesias C, Bernard H, Tripier R. Copper(II) and Zinc(II) Complexation with N Ethylene hydroxycyclams and Consequences on the Macrocyclic Backbone Configuration. Dalton Trans 2022; 51:8640-8656. [DOI: 10.1039/d2dt00941b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a series of four cyclams and cross-bridged cyclams, N-functionalized by one hydroxyethyl arm, which may incorporate additional methyl(s) group(s). The Cu(II) and Zn(II) complexes of these ligands were...
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Claudon G, Bernard H, Le Bris N, Handel H. Synthesis of three dissymmetrical pentaamines via bisaminals of linear tetraamines. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823406777946860] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Bisaminals of linear tetraamines were selectively N-monofunctionalised with acrylonitrile in a Michael-type addition giving rise, after reduction, to three open-chain dissymmetrical pentaamines, bearing a new aminopropyl group on one terminal nitrogen atom.
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Affiliation(s)
- Géraldine Claudon
- Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Hélène Bernard
- Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Nathalie Le Bris
- Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Henri Handel
- Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, CNRS UMR 6521, Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
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Paúrová M, David T, Císařová I, Lubal P, Hermann P, Kotek J. Optimization of the selectivity and rate of copper radioisotope complexation: formation and dissociation kinetic studies of 1,4,8-trimethylcyclam-based ligands with different coordinating pendant arms. NEW J CHEM 2018. [DOI: 10.1039/c8nj00419f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Influence of coordinating pendant arm character on selectivity and rate of copper(ii) complexation was investigated to optimize ligands for radiomedicinal use.
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Affiliation(s)
- Monika Paúrová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Tomáš David
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Přemysl Lubal
- Department of Chemistry
- Faculty of Science
- Masaryk University
- Brno
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
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Bartoli F, Bencini A, Conti L, Giorgi C, Valtancoli B, Paoli P, Rossi P, Le Bris N, Tripier R. Catching anions with coloured assemblies: binding of pH indicators by a giant-size polyammonium macrocycle for anion naked-eye recognition. Org Biomol Chem 2016; 14:8309-21. [DOI: 10.1039/c6ob01474g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Among inorganic anions, only triphosphate displaces bromocresol purple from its assembly with a tetra-cyclam macrocycle, allowing for its selective colorimetric detection.
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Affiliation(s)
- Francesco Bartoli
- Dipartimento di Chimica ‘Ugo Schiff’
- Università degli Studi di Firenze
- Sesto Fiorentino
- Italy
| | - Andrea Bencini
- Dipartimento di Chimica ‘Ugo Schiff’
- Università degli Studi di Firenze
- Sesto Fiorentino
- Italy
| | - Luca Conti
- Dipartimento di Chimica ‘Ugo Schiff’
- Università degli Studi di Firenze
- Sesto Fiorentino
- Italy
| | - Claudia Giorgi
- Dipartimento di Chimica ‘Ugo Schiff’
- Università degli Studi di Firenze
- Sesto Fiorentino
- Italy
| | - Barbara Valtancoli
- Dipartimento di Chimica ‘Ugo Schiff’
- Università degli Studi di Firenze
- Sesto Fiorentino
- Italy
| | - Paola Paoli
- Dipartimento di Ingegneria Industriale
- Università degli Studi di Firenze
- Firenze
- Italy
| | - Patrizia Rossi
- Dipartimento di Ingegneria Industriale
- Università degli Studi di Firenze
- Firenze
- Italy
| | - Nathalie Le Bris
- UMR-CNRS 6521
- UFR des Sciences et Techniques
- 6 avenue Victor le Gorgeu
- C.S. 93837
- Université de Bretagne Occidentale
| | - Raphael Tripier
- UMR-CNRS 6521
- UFR des Sciences et Techniques
- 6 avenue Victor le Gorgeu
- C.S. 93837
- Université de Bretagne Occidentale
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Paúrová M, Havlíčková J, Pospíšilová A, Vetrík M, Císařová I, Stephan H, Pietzsch HJ, Hrubý M, Hermann P, Kotek J. Bifunctional Cyclam-Based Ligands with Phosphorus Acid Pendant Moieties for Radiocopper Separation: Thermodynamic and Kinetic Studies. Chemistry 2015; 21:4671-87. [DOI: 10.1002/chem.201405777] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Indexed: 11/08/2022]
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Camus N, Halime Z, Le Bris N, Bernard H, Platas-Iglesias C, Tripier R. Full Control of the Regiospecific N-Functionalization of C-Functionalized Cyclam Bisaminal Derivatives and Application to the Synthesis of their TETA, TE2A, and CB-TE2A Analogues. J Org Chem 2014; 79:1885-99. [DOI: 10.1021/jo4028566] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Nathalie Camus
- Université de Brest, UMR-CNRS 6521/SFR148 ScInBioS, UFR Sciences
et Techniques, 6 Avenue Victor le Gorgeu,
C.S. 93837, 29238 Brest, France
| | - Zakaria Halime
- Université de Brest, UMR-CNRS 6521/SFR148 ScInBioS, UFR Sciences
et Techniques, 6 Avenue Victor le Gorgeu,
C.S. 93837, 29238 Brest, France
| | - Nathalie Le Bris
- Université de Brest, UMR-CNRS 6521/SFR148 ScInBioS, UFR Sciences
et Techniques, 6 Avenue Victor le Gorgeu,
C.S. 93837, 29238 Brest, France
| | - Hélène Bernard
- Université de Brest, UMR-CNRS 6521/SFR148 ScInBioS, UFR Sciences
et Techniques, 6 Avenue Victor le Gorgeu,
C.S. 93837, 29238 Brest, France
| | - Carlos Platas-Iglesias
- Departamento
de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Raphaël Tripier
- Université de Brest, UMR-CNRS 6521/SFR148 ScInBioS, UFR Sciences
et Techniques, 6 Avenue Victor le Gorgeu,
C.S. 93837, 29238 Brest, France
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Bernier N, Esteves CV, Delgado R. Heteroditopic receptor based on crown ether and cyclen units for the recognition of zwitterionic amino acids. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.110] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Silversides JD, Smith R, Archibald SJ. Challenges in chelating positron emitting copper isotopes: tailored synthesis of unsymmetric chelators to form ultra stable complexes. Dalton Trans 2011; 40:6289-97. [PMID: 21455520 DOI: 10.1039/c0dt01395a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of chelators that form high stability complexes with copper(II) isotopes and do not suffer from transchelation in vivo has been a goal for many chemists. Such chelators will facilitate the exploitation of the (64)Cu isotope (t(1/2) = 12.7 h, β(+) (19%); β(-) (39%); EC (41%)) for positron emission tomography imaging studies, which has a longer half life relative to the more commonly used (18)F (t(1/2) = 109.8 min) and (11)C (t(1/2) = 20.4 min) isotopes. One option is the CBTE2A chelator, which has been championed by Weisman, Wong and Anderson, and, more recently, alternate bifunctional chelator (BFC) versions have been synthesised. Improved synthetic methods are required for unsymmetric derivatisation of these chelators to allow more selective biomolecule attachment. This work investigates synthetic routes to form new unsymmetric chelating ligands via stepwise reaction of the bisaminal precursor, determines their X-ray structures and demonstrates cold copper(II) isotope complex formation.
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Affiliation(s)
- Jon D Silversides
- Department of Chemistry, The University of Hull, Cottingham Road, Hull, UK HU6 7RX
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Bernier N, Costa J, Delgado R, Félix V, Royal G, Tripier R. trans-Methylpyridine cyclen versus cross-bridged trans-methylpyridine cyclen. Synthesis, acid-base and metal complexation studies (metal = Co2+, Cu2+, and Zn2+). Dalton Trans 2011; 40:4514-26. [PMID: 21409259 DOI: 10.1039/c0dt01191f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of the cross-bridged cyclen CRpy(2) {4,10-bis((pyridin-2-yl)methyl)-1,4,7,10-tetraazabicyclo[5.5.2]tetradecane}, a constrained analogue of the previously described trans-methylpyridine cyclen Cpy(2) is reported. The additional ethylene bridge confers to CRpy(2) proton-sponge type behaviour which was explored by NMR and potentiometric studies. Transition metal complexes have been synthesized (by complexation of both ligands with Co(2+), Cu(2+) and Zn(2+)) and characterized in solution and in the solid state. The single crystal X-ray structures of [CoCpy(2)](2+), [CuCpy(2)](2+) and [ZnCpy(2)](2+) complexes were determined. Stability constants of the complexes, including those of the cross-bridged derivative, were determined using potentiometric titration data and the kinetic inertness of the [CuCRpy(2)](2+) complex in an acidic medium (half-life values) was evaluated by spectrophotometry. The pre-organized structure of the cross-bridged ligand imposes an additional strain for the complexation leading to complexes with smaller thermodynamic stability in comparison with the related non-bridged ligand. The electrochemical study involving cyclic voltammetry underlines the importance of the ethylene cross-bridge on the redox properties of the transition metal complexes.
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Affiliation(s)
- Nicolas Bernier
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157, Oeiras, Portugal
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13
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Miéville P, Jaccard H, Reviriego F, Tripier R, Helm L. Synthesis, complexation and NMR relaxation properties of Gd3+ complexes of Mes(DO3A)3. Dalton Trans 2011; 40:4260-7. [DOI: 10.1039/c0dt01597k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Delépine AS, Tripier R, Le Baccon M, Handel H. From Flexible to Constrained Tris(tetraamine) Ligands: Synthesis, Acid-Base Properties, and Structural Effect on the Coordination Process with Nucleotides. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000495] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Bencini A, Biagini S, Giorgi C, Handel H, Le Baccon M, Mariani P, Paoletti P, Paoli P, Rossi P, Tripier R, Valtancoli B. A Tris-Macrocycle with Proton Sponge Characteristics as Efficient Receptor for Inorganic Phosphate and Nucleotide Anions. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900770] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Delépine AS, Tripier R, Bernard H, Bris NL, Handel H. Selective mono-N-alkylation of triethylenetetraamine. A new versatile route to polylinear aza-ligands. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.03.088] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Doménech A, García-España E, Bernier N, Tripier R, Handel H. Electrochemically-driven conformational shift in mono- and di-copper constrained macrotricyclic cyclen receptors. Dalton Trans 2008:3169-77. [DOI: 10.1039/b718163a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Plutnar J, Havlíčková J, Kotek J, Hermann P, Lukeš I. Unsymmetrically substituted side-bridged cyclam derivatives and their Cu(ii) and Zn(ii) complexes. NEW J CHEM 2008. [DOI: 10.1039/b709747f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Balogh E, Tripier R, Fousková P, Reviriego F, Handel H, Tóth E. Monopropionate analogues of DOTA4– and DTPA5–: kinetics of formation and dissociation of their lanthanide(iii) complexes. Dalton Trans 2007:3572-81. [PMID: 17680048 DOI: 10.1039/b706353a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The replacement of an acetate function of the macrocyclic DOTA4-(DO3A-Nprop4-) or the acyclic DTPA5- in terminal position (DTTA-Nprop5-) has been recently shown to result in a significant increase of the water exchange rate on the Gd3+ complexes, which makes these chelates potential contrast agents for MRI applications. Here, two novel and straightforward synthetic routes to H4DO3A-Nprop are described. Protonation constants of DO3A-Nprop4- and stability constants with several alkaline earth and transition metal ions have been determined by potentiometry. For each metal, the thermodynamic stability constant is decreased in comparison to the DOTA chelates. The formation reaction of LnDO3A-Nprop- complexes (Ln=Ce, Gd and Yb) proceeds via the rapid formation of a diprotonated intermediate and its subsequent deprotonation and rearrangement in a slow, OH- catalyzed process. The stability of the LnH2DO3A-Nprop* intermediates is similar to those reported for the corresponding DOTA analogues. The rate constants of the OH- catalyzed deprotonation step increase with decreasing lanthanide ion size, and are slightly higher than for DOTA complexes. The kinetic inertness of GdDTTA-Nprop2- was characterized by the rates of its exchange reactions with Zn2+ and Eu3+. The rate of the reaction between GdDTTA-Nprop2- and Zn2+ increases with Zn2+ concentration, while it is independent of pH, implying that the exchange takes place predominantly via direct attack of the metal ion on the complex. In the Eu3+ exchange, the rate decreases with increasing concentration of the exchanging ion which is accounted for by the transitional formation of a dinuclear GdDTTA-NpropEu+ species. The kinetic inertness of the monopropionate GdDTTA-Nprop2- is decreased in comparison to GdDTPA2-: all rate constants, characterizing the dissociation reaction via either proton- or metal-catalyzed pathways being higher by 1-2 orders of magnitude. Similarly, a study of the acid-catalyzed dissociation of the macrocyclic CeDO3A-Nprop- showed a partial loss of the kinetic inertness with regard to the tetraacetate derivative CeDOTA-.
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Affiliation(s)
- Edina Balogh
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, ISIC, BCH, CH-1015, Lausanne, Switzerland
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Bernier N, Allali M, Tripier R, Conan F, Patinec V, Develay S, Le Baccon M, Handel H. New side-bridged bismacrocycles and cross-bridged macrotricycles. Syntheses and Cu(ii) complexation study. NEW J CHEM 2006. [DOI: 10.1039/b515150c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Vitha T, Kotek J, Rudovský J, Kubíček V, Císařová I, Hermann P, Lukeš I. Selective Protection of 1,4,8,11-Tetraazacyclotetradecane (Cyclam) in Position 1,4 with the Phosphonothioyl Group and Synthesis of a Cyclam-1,4-bis(methylphosphonic Acid). Crystal Structures of Several Cyclic Phosphonothioamides. ACTA ACUST UNITED AC 2006. [DOI: 10.1135/cccc20060337] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A new cyclam-based ligand, 1,4,8,11-tetraazacyclotetradecane-1,4-bis(methylphosphonic acid) (1,4-H4te2p), was synthesized. Cyclam was protected by the reaction with PhP(S)Cl2 to form exclusively five-membered cyclic phenylphosphonothioic diamide 2 in a moderate yield. The solid-state structures of 2 and several by-products were determined. Compound 2 was isolated as two stable conformers differing in a mutual position of benzene ring and sulfur atom with respect to the cyclam ring. Compound 2 was used for the synthesis of 1,4-dibenzylcyclam. However, the deprotection of the thiophosphoryl-protected bis(methylphosphonate diester) with aqueous HCl under non-optimized conditions led to a mixture of cyclam derivatives differently substituted with methylphosphonic acid groups. The crystal structures of the target product, 1,4-H4te2p, and also 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrakis(methylphosphonic acid) (H8tetp) were determined. A similar reaction with cyclen (1,4,7,10-tetraazacyclododecane) led only to hardly purifiable mixtures.
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22
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Claudon G, Le Bris N, Bernard H, Handel H. PowerfulN-Monoalkylation of Linear Tetraamines via Bisaminal Intermediates. European J Org Chem 2004. [DOI: 10.1002/ejoc.200400459] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Wong EH, Weisman GR, Hill DC, Reed DP, Rogers ME, Condon JS, Fagan MA, Calabrese JC, Lam KC, Guzei IA, Rheingold AL. Synthesis and Characterization of Cross-Bridged Cyclams and Pendant-Armed Derivatives and Structural Studies of Their Copper(II) Complexes. J Am Chem Soc 2000. [DOI: 10.1021/ja001295j] [Citation(s) in RCA: 161] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Edward H. Wong
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Gary R. Weisman
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Daniel C. Hill
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - David P. Reed
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Mark E. Rogers
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Jeffrey S. Condon
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Maureen A. Fagan
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Joseph C. Calabrese
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Kin-Chung Lam
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Ilia A. Guzei
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Arnold L. Rheingold
- Contribution from the Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824-3598, the Central Research and Development Department, E. I. DuPont Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0228, and the Crystallography Laboratory, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
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Kotek J, Vojtíšek P, Císařová I, Hermann P, Jurečka P, Rohovec J, Lukeš I. Bis(methylphosphonic Acid) Derivatives of 1,4,8,11-Tetraazacyclotetradecane (Cyclam). Synthesis, Crystal and Molecular Structures, and Solution Properties. ACTA ACUST UNITED AC 2000. [DOI: 10.1135/cccc20001289] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cyclam derivatives with methylphosphonic acid arms in position 1,8 and substituent R = H, Me, CH2Ph in positions 4 and 11 are synthesised by Mannich reaction of an appropriate cyclam derivative, formaldehyde and phosphonic acid/diethyl phosphite followed by removal of protecting benzyl groups from nitrogen atoms. Mono(methylphosphonic acid) derivative of cyclam can be obtained by a similar route. Crystal structures of four phosphonic acid derivatives show the same ring conformation and orientation pendants due to strong intramolecular hydrogen bonds between phosphonate oxygen atoms and protonated nitrogen atoms adjacent over ethylene chains. The hydrogen bonds are stable even in aqueous solution. Activation parameters for destabilisation of the conformation are estimated from temperature-dependent NMR measurement. The protonation constants determined confirm the expected high basicity of the compounds and its dependence on the nitrogen atom substituents. The enhanced basicity of the nitrogen atoms non-bonded to methylenephosphonic acid moiety, is explained by the presence of the strong hydrogen bonds.
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