1
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Hsieh CC, Liao PK, Chen CW, Chiang MH, Horng YC. The effect of anions in the synthesis and structure of pyrazolylamidino copper(II) complexes. Dalton Trans 2023; 52:4429-4441. [PMID: 36916977 DOI: 10.1039/d3dt00103b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Six new pyrazolylamidino Cu(II) complexes are synthesized directly from the reactions of Cu(X)2 salts (X = ClO4-, BF4-, or Cl-) and pyrazole (pzH) in nitrile solution (RCN, R = Me or Et) at 298 K via the metal-mediated coupling of RCN with pzH: [Cu(HNC(R)pz)2(X)2] (X = ClO4- or BF4-, R = Me, 1 or 7 and Et, 2 or 8, respectively) and dichloro Cu(II) complexes [Cu2Cl2(μ-Cl)2(HNC(Me)pz)2] (3) and [CuCl2(HNC(Et)pz)] (4). Four more new complexes, [Cu2(μ-Cl)2(HNC(Me)pz)2(pzH)2][X]2 (X = ClO4-, 5 and BF4-, 9) and [Cu2(μ-Cl)2(HNC(Et)pz)2(pzH)2(X)2] (X = ClO4-, 6 and BF4-, 10), are obtained indirectly from the anion substitution reaction with Cl- ions in 1 and 7, and 2 and 8, respectively. All complexes are characterized by EA, FTIR, UV-vis and EPR spectroscopy and X-ray crystallographic analyses. HNC(Et)pz or pzH is unobserved in both the nitrile-exchange reaction of 2 to d6-1 and the anion-substitution reaction of 2 to d6-5 in the CD3CN solution. The 1H NMR results reveal that the pzH-RCN coupling is intramolecular and reversible on a Cu(II) center. The crystal structures of these complexes show diverse supramolecular assemblies through imino NH⋯anion hydrogen bonds and pyrazolylamidino pz-pz (π⋯π) and pz-Cu(II) (π⋯metal) interactions. EPR results suggest weak magnetic couplings between Cu(II) centers in the polynuclear Cu(II) complexes. The yield and rate of the formation of 1 are higher in the reaction of Cu(ClO4)2 with a 4-fold molar excess of pzH compared with a 2-fold excess, indicating that [Cu(pzH)4]2+ is the more active species for pzH-RCN coupling. The highest rate for the formation of 1 is achieved when [Cu(pzH)4(ClO4)2] is used in MeCN solution. Thus, a plausible synthetic path for synthesizing pyrazolylamidino Cu(II) complexes is established. An intermediate species, [Cu(HNC(Me)pz)2(pzH)2][ClO4]2 (1a), is proposed for the synthetic process based on spectroscopic studies and DFT calculations. The reaction of [Cu(pzH)4X2] (X = ClO4-, Cl-, NO3-, or BF4-) in MeCN solution suggests that the lability of coordinated anions upon nitrile substitution affects the rate of the formation of bis-pyrazolylamidino Cu(II) complexes.
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Affiliation(s)
| | - Po-Kuang Liao
- Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan.
| | - Chia-Wei Chen
- Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan.
| | - Ming-Hsi Chiang
- Institute of Chemistry, Academia Sinica, Taipei 11528, Taiwan.,Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Yih-Chern Horng
- Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan.
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2
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Bera P, Brandão P, Mondal G, Santra A, Jana A, Mokhamatam RB, Manna SK, Mandal TK, Bera P. An unusual iminoacylation of 2-amino pyridyl thiazole: Synthesis, X-ray crystallography and DFT study of copper(II) amidine complexes and their cytotoxicity, DNA binding and cleavage study. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.11.069] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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3
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Ma HF, Ding LW, Chen L, Wang YL, Liu QY. Two cadmium compounds with adenine and carboxylate ligands: syntheses, structures and photoluminescence. J COORD CHEM 2016. [DOI: 10.1080/00958972.2016.1256477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Hui-Fang Ma
- Key Laboratory of Functional Small Organic Molecule of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Li-Wen Ding
- Key Laboratory of Functional Small Organic Molecule of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Lin Chen
- Key Laboratory of Functional Small Organic Molecule of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Yu-Ling Wang
- Key Laboratory of Functional Small Organic Molecule of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Qing-Yan Liu
- Key Laboratory of Functional Small Organic Molecule of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
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4
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Yu M, Wang Z, Tian M, Lu C, Li S, Du H. Purinyl N(3)-Directed Palladium-Catalyzed C-H Alkoxylation of N(9)-Arylpurines: A Late-Stage Strategy to Synthesize N(9)-(ortho-Alkoxyl)arylpurines. J Org Chem 2016; 81:3435-42. [PMID: 27015589 DOI: 10.1021/acs.joc.6b00148] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A palladium-catalyzed alkoxylation of N(9)-arylpurines with primary or secondary alcohols has been developed successfully, which is a rare C-H activation reaction of polynitrogenated purines and offers a late-stage strategy to synthesize N(9)-(ortho-alkoxyl)arylpurines. Although there are more than four nitrogen atoms present in the purine moiety, the reaction can be effectively conducted by sterically blocking the N(1) site for catalyst coordination and first employing the purinyl N(3) atom as a directing group.
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Affiliation(s)
- Mingwu Yu
- Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Zhiqian Wang
- Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Miao Tian
- Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Chenghu Lu
- Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Shunlai Li
- Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Hongguang Du
- Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, P. R. China
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5
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Gómez-Iglesias P, Martín-Alvarez JM, Miguel D, Villafañe F. Amidino ligands obtained from the coupling of 1-methylcytosine and nitrile: a new method to incorporate biomolecules into luminescent Re(CO)3 complexes. Dalton Trans 2015; 44:17478-81. [DOI: 10.1039/c5dt03221k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Amidino chelating ligands obtained from the coupling of 1-methylcytosine with nitriles allow the incorporation of biologically relevant substrates into Re(CO)3 complexes.
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Affiliation(s)
- Patricia Gómez-Iglesias
- GIR MIOMeT-IU Cinquima-Química Inorgánica
- Facultad de Ciencias
- Campus Miguel Delibes
- Universidad de Valladolid
- 47011 Valladolid
| | - Jose Miguel Martín-Alvarez
- GIR MIOMeT-IU Cinquima-Química Inorgánica
- Facultad de Ciencias
- Campus Miguel Delibes
- Universidad de Valladolid
- 47011 Valladolid
| | - Daniel Miguel
- GIR MIOMeT-IU Cinquima-Química Inorgánica
- Facultad de Ciencias
- Campus Miguel Delibes
- Universidad de Valladolid
- 47011 Valladolid
| | - Fernando Villafañe
- GIR MIOMeT-IU Cinquima-Química Inorgánica
- Facultad de Ciencias
- Campus Miguel Delibes
- Universidad de Valladolid
- 47011 Valladolid
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6
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Ali SM. Thermodynamical Criteria of the Higher Selectivity of Zirconium Oxycations over Hafnium Oxycations towards Organophosphorus Ligands: Density Functional Theoretical Investigation. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301630] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sk. Musharaf Ali
- Chemical Engineering Division, Chemical Engineering Group, Bhabha Atomic Research Centre, Mumbai 400085, India, http://www.barc.gov.in
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7
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Domínguez-Martín A, García-Raso A, Cabot C, Choquesillo-Lazarte D, Pérez-Toro I, Matilla-Hernández A, Castiñeiras A, Niclós-Gutiérrez J. Structural insights on the molecular recognition patterns between N(6)-substituted adenines and N-(aryl-methyl)iminodiacetate copper(II) chelates. J Inorg Biochem 2013; 127:141-9. [PMID: 23490423 DOI: 10.1016/j.jinorgbio.2013.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Revised: 02/07/2013] [Accepted: 02/08/2013] [Indexed: 10/27/2022]
Abstract
For a better understanding of the metal binding pattern of N(6)-substituted adenines, six novel ternary Cu(II) complexes have been structurally characterized by single crystal X-ray diffraction: [Cu(NBzIDA)(HCy5ade)(H2O)]·H2O (1), [Cu(NBzIDA)(HCy6ade)(H2O)]·H2O (2), [Cu(FurIDA)(HCy6ade)(H2O)]·H2O (3), [Cu(MEBIDA)(HBAP)(H2O)]·H2O (4), [Cu(FurIDA)(HBAP)]n (5) and {[Cu(NBzIDA)(HdimAP)]·H2O}n (6). In these compounds NBzIDA, FurIDA and MEBIDA are N-substituted iminodiacetates with a non-coordinating aryl-methyl pendant arm (benzyl in NBzIDA, p-tolyl in MEBIDA and furfuryl in FurIDA) whereas HBAP, HCy5ade, HCy6ade and HdimAP are N(6)-substituted adenine derivatives with a N-benzyl, N-cyclopentyl, N-cyclohexyl or two N-methyl groups, respectively. Regardless of the molecular (1-4) or polymeric (5-6) nature of the studied compounds, the Cu(II) centre exhibits a type 4+1 coordination where the tridentate IDA-like chelators adopt a mer-conformation. In 1-5 the N(6)-R-adenines use their most stable tautomer H(N9)adenine-like, and molecular recognition consists of the cooperation of the CuN3(purine) bond and the intra-molecular interligand N9H···O(coordinated carboxy) interaction. In contrast, N(6),N(6)-dimethyl-adenine shows the rare tautomer H(N3)dimAP in 6, so that the molecular recognition with the Cu(NBzIDA) chelate consist of the CuN9 bond and the N3H···O intra-molecular interligand interaction. Contrastingly to the cytokinin activity found in the free ligands HBAP (natural cytokinin), HCy5ade and HCy6ade, the corresponding Cu(II) ternary complexes did not show any activity.
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Affiliation(s)
- Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, Campus Cartuja, University of Granada, E-18071 Granada, Spain.
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8
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Amo-Ochoa P, Castillo O, Harrington RW, Zamora F, Houlton A. Substituent and Noncovalent Interaction Effects in the Reactivity of Purine Derivatives with Tetracarboxylato-dirhodium(II) Units. Rationalization of a Rare Binding Mode via N3. Inorg Chem 2013; 52:2174-81. [DOI: 10.1021/ic302602c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pilar Amo-Ochoa
- Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid,
Spain
| | - Oscar Castillo
- Departamento de Química
Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado
644, E−48080 Bilbao, Spain
| | - Ross W. Harrington
- Chemical Nanoscience Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne, NE1 7RU,
U.K
| | - Félix Zamora
- Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid,
Spain
| | - Andrew Houlton
- Chemical Nanoscience Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne, NE1 7RU,
U.K
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9
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Martín-Ortíz M, Gómez-Gallego M, Ramírez de Arellano C, Sierra MA. The selective synthesis of metallanucleosides and metallanucleotides: a new tool for the functionalization of nucleic acids. Chemistry 2012; 18:12603-8. [PMID: 22933336 DOI: 10.1002/chem.201202327] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Indexed: 11/11/2022]
Abstract
Nucleobases team up: the efficient and selective preparation of purine-derived metallanucleosides, metallanucleotides, and metalladinucleotides having M-C bonds (M=Ir(III), Rh(III)) is reported for the first time. The results presented may be applied to the synthesis of functionalized nucleic acids, or DNA/RNA-modified segments.
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Affiliation(s)
- Mamen Martín-Ortíz
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
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10
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Montagner D, Venzo A, Zangrando E, Longato B. Irreversible Insertion of Benzonitrile into Platinum(II)−Nitrogen Bonds of Nucleobase Complexes. Synthesis and Structural Characterization of Stable Azametallacycle Compounds. Inorg Chem 2010; 49:2103-10. [DOI: 10.1021/ic901508w] [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]
Affiliation(s)
- Diego Montagner
- Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Alfonso Venzo
- CNR, Istituto di Scienze e Tecnologie Molecolari, Via Marzolo 1, 35131 Padova, Italy
| | - Ennio Zangrando
- Dipartimento di Scienze Chimiche, Università di Trieste, Via Giorgieri 1, 34127 Trieste, Italy
| | - Bruno Longato
- Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padova, Italy
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11
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Galindo MA, Amantia D, Martinez-Martinez A, Clegg W, Harrington RW, Moreno Martinez V, Houlton A. Reactions of Pd(II) with Chelate-Tethered 2,6-Diaminopurine Derivatives: N3-Coordination and Reaction of the Purine System. Inorg Chem 2009; 48:11085-91. [DOI: 10.1021/ic901475y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Miguel A. Galindo
- Chemical Nanoscience Laboratory and Crystallography Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - David Amantia
- Chemical Nanoscience Laboratory and Crystallography Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - Alberto Martinez-Martinez
- Chemical Nanoscience Laboratory and Crystallography Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - William Clegg
- Chemical Nanoscience Laboratory and Crystallography Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - Ross W. Harrington
- Chemical Nanoscience Laboratory and Crystallography Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - Virtudes Moreno Martinez
- Universidad de Barcelona, Facultad de Quimica, Departamento de Quimica Inorganica, Marti Franqués 1-11, E-08028 Barcelona, Spain
| | - Andrew Houlton
- Chemical Nanoscience Laboratory and Crystallography Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
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12
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Singh SK, Sharma S, Dwivedi SD, Zou RQ, Xu Q, Pandey DS. Reactivity of the Oxime/Oximato Group in Ruthenium(II) Complexes. Inorg Chem 2008; 47:11942-9. [DOI: 10.1021/ic8009699] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sanjay Kumar Singh
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi − 221 005 U.P., India, and National Institute of Advanced Industrial Science and Technology (AIST), 1−8−31 Midorigaoka, Ikeda, Osaka 563−8577, Japan
| | - Sanjeev Sharma
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi − 221 005 U.P., India, and National Institute of Advanced Industrial Science and Technology (AIST), 1−8−31 Midorigaoka, Ikeda, Osaka 563−8577, Japan
| | - Sudhakar Dhar Dwivedi
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi − 221 005 U.P., India, and National Institute of Advanced Industrial Science and Technology (AIST), 1−8−31 Midorigaoka, Ikeda, Osaka 563−8577, Japan
| | - Ru-Qiang Zou
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi − 221 005 U.P., India, and National Institute of Advanced Industrial Science and Technology (AIST), 1−8−31 Midorigaoka, Ikeda, Osaka 563−8577, Japan
| | - Qiang Xu
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi − 221 005 U.P., India, and National Institute of Advanced Industrial Science and Technology (AIST), 1−8−31 Midorigaoka, Ikeda, Osaka 563−8577, Japan
| | - Daya Shankar Pandey
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi − 221 005 U.P., India, and National Institute of Advanced Industrial Science and Technology (AIST), 1−8−31 Midorigaoka, Ikeda, Osaka 563−8577, Japan
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13
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Machura B, Kruszynski R, Mroziński J, Kusz J. Synthesis, spectroscopic characterization, X-ray structure and DFT calculations of rhenium(III) complex with 1-isoquinolinyl phenyl ketone. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.02.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Arizaga L, González R, Chiozzone R, Kremer C, Cerdá MF, Armentano D, Munno GD, Lloret F, Faus J. Synthesis, crystal structure, electrochemical and magnetic properties of (NBu4)[ReCl5(L)] with L=pyrimidine and pyridazine. Polyhedron 2008. [DOI: 10.1016/j.poly.2007.10.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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15
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Chiozzone R, González R, Kremer C, Cerdá MF, Armentano D, De Munno G, Martínez-Lillo J, Faus J. A novel series of rhenium-bipyrimidine complexes: synthesis, crystal structure and electrochemical properties. Dalton Trans 2007:653-60. [PMID: 17268598 DOI: 10.1039/b615136a] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four novel rhenium complexes of formula [ReCl(4)(bpym)] (1), [ReBr(4)(bpym)] (2) PPh(4)[ReCl(4)(bpym)] (3) and NBu(4)[ReBr(4)(bpym)] (4) (bpym = 2,2'-bipyrimidine, PPh(4) = tetraphenylphosphonium cation and NBu(4) = tetrabutylammonium cation), have been synthesized and their crystal structures determined by single-crystal X-ray diffraction. The structures of 1 and 2 consist of [ReX(4)(bpym)] molecules held together by van der Waals forces. In both complexes the Re(iv) central atom is surrounded by four halide anions and two nitrogen atoms of a bpym bidentate ligand in a distorted octahedral environment. The structures of 3 and 4 consist of [ReX(4)(bpym)](-) anions and PPh(4)(+) () or NBu(4)(+) (4) cations. The coordination sphere of the Re(iii) metal ion is the same as in 1 and 2, respectively. However, whereas the Re-X bonds are longer the Re-N bonds are shorter than in 1 and 2. This fact reveals that the bpym ligand forms a stronger bond with Re(iii) than with Re(iv) resulting in a stabilisation of the lower oxidation state. [ReX(4)(bpym)] complexes are easily reduced, chemically and electrochemically, to the corresponding [ReX(4)(bpym)](-) anions. A voltammetric study shows that the electron transference is a reversible process characterized by formal redox potentials of +0.19 V (1) and +0.32 V (2) vs. NHE, in acetonitrile as solvent.
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Affiliation(s)
- Raúl Chiozzone
- Cátedra de Química Inorgánica, Facultad de Química de la Universidad de la República, Avda. General Flores 2124, CC 1157, Montevideo, Uruguay.
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Banerjee P, Mostafa G, Castiñeiras A, Goswami S. Two Novel Reactions of a Ruthenium-Coordinated Phenazine – Oxidative Aromatic Ring Hydroxylation and Dimerization via a New C–N Bond Formation. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200600864] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Structural and spectroscopic studies on rhenium(III) diphenyl(2-pyridyl)phosphine oxide complexes. Polyhedron 2006. [DOI: 10.1016/j.poly.2006.03.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Khripun AV, Kukushkin VY, Selivanov SI, Haukka M, Pombeiro AJL. Unusual Reaction between (Nitrile)Pt Complexes and Pyrazoles: Substitution Proceeds via Metal-Mediated Nitrile−Pyrazole Coupling Followed by Elimination of the Nitrile. Inorg Chem 2006; 45:5073-83. [PMID: 16780329 DOI: 10.1021/ic0602300] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The reaction of platinum(IV) complex trans-[PtCl4(EtCN)2] with pyrazoles 3,5-RR'pzH (R/R' = H/H, Me/H, Me/Me) leads to the formation of the trans-[PtCl4{NH=C(Et)(3,5-RR'pz)}2] (1-3) species due to the metal-mediated nitrile-pyrazole coupling. Pyrazolylimino complexes 1-3 (i) completely convert to pyrazole complexes cis-[PtCl4(3,5-RR'pzH)2] by elimination of EtCN upon reflux in a CH2Cl2 solution or upon heating in the solid state; (ii) undergo exchange at the imino C atom with another pyrazole different from that contained in the pyrazolylimino ligand. The reaction of trans-[PtIICl2(EtCN)2] and 3,5-RR'pzH, conducted under conditions similar to those for trans-[PtIVCl4(EtCN)2], is much less selective, and the composition of the products strongly depends on the pyrazole employed: (a) with pzH, the reaction gives a mixture of three products, i.e., [PtCl2NH=C(Et)pz-kappa2N,N}] (4), [PtCl(pzH){NH=C(Et)pz-kappa2N,N}]Cl (5), and [Pt(pzH)2{NH=C(Et)pz-kappa2N,N}]Cl2 (6) (complexes 5 and 6 are rather unstable and gradually transform to trans-[PtCl2(pzH2] and [Pt(pzH)(4)]Cl(2) and free EtCN); (b) with 3,5-Me(2)pzH, the reaction leads to the formation of [PtCl2NH=C(Et)(3,5-Me2pz)-kappa2N,N}] (7) and [PtCl(3,5-Me2pzH)3]Cl (8); (c) in the case of asymmetric pyrazole 3(5)-MepzH, which can be added to EtCN and/or bind metal centers by any of the two nonequivalent nitrogen sites, a broad mixture of currently unidentified products is formed. The reduction of 1-3 with Ph3P=CHCO2Me in CHCl3 allows for the formation of corresponding platinum(II) compounds trans-[PtCl2{NH=C(Et)(3,5-RR'pz)}2] (9-11). Ligands NH=C(Et)(3,5-RR'pz) (12-14) were almost quantitatively liberated from 9-11 with 2 equiv of 1,2-bis-(diphenylphosphino)ethane in CDCl3, giving free imines 12-14 in solution and the precipitate of trans-[Pt(dppe)2](Cl)2. Pyrazolylimines 12-14 undergo splitting in CDCl3 solution at 20-25 degrees C for ca. 20 h to furnish the parent propiononitrile and the pyrazole 3,5-RR'pzH, but they can be synthetically utilized immediately after the liberation.
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Affiliation(s)
- Anatoly V Khripun
- Department of Chemistry, St. Petersburg State University, 198504 Stary Petergof, Russian Federation
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Longato B, Montagner D, Bandoli G, Zangrando E. Platinum(II)-Mediated Coupling Reactions of Acetonitrile with the Exocyclic Nitrogen of 9-Methyladenine and 1-Methylcytosine. Synthesis, NMR Characterization, and X-ray Structures of New Azametallacycle Complexes. Inorg Chem 2006; 45:1805-14. [PMID: 16471997 DOI: 10.1021/ic051755f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The hydroxo complex cis-[L2Pt(mu-OH)]2(NO3)2, (L = PMePh2, 1a), in CH3CN solution, deprotonates the NH2 group of 9-methyladenine (9-MeAd) to give the cyclic trinuclear species cis-[L2Pt[9-MeAd(-H)]]3(NO3)3, (L = PMePh2, 2a), in which the nucleobase binds the metal centers through the N(1), N(6) atoms. In solution at room temperature, 2a slowly reacts with the solvent to form quantitatively the mononuclear azametallacycle cis-[L2PtNH=C(Me)[9-MeAd(-2H)]]NO3 (L = PMePh2, 3a), containing as anionic ligand the deprotonated form of molecule N-(9-methyl-1,9-dihydro-purin-6-ylidene)-acetamidine. In the same experimental conditions, the hydroxo complex with PPh3 (1b) forms immediately the insertion product 3b. Single-crystal X-ray analyses of 3a and 3b show the coordination of the platinum cation at the N(1) site of the purine moiety and to the N atom of the inserted acetonitrile, whereas the exocyclic amino nitrogen binds the carbon atom of the same CN group. The resulting six-membered ring is slightly distorted from planarity, with carbon-nitrogen bond distances for the inserted nitrile typical of a double bond [C(3)-N(2) = 1.292(7) Angstroms in 3a and 1.279(11) Angstroms in 3b], while the remaining CN bonds of the metallocycle are in the range of 1.335(8)-1.397(10) Angstroms. A detailed multinuclear 1H, 31P, 13C, and 15N NMR study shows that the nitrogen atom of the inserted acetonitrile molecule binds a proton suggesting for 3a,b an imino structure in solution. In DMSO and chlorinated solvents, 3a slowly releases the nitrile reforming the trinuclear species 2a, whereas 3b forms the mononuclear derivative cis-[L2Pt[9-MeAd(-H)]]NO3 (L = PPh3, 4b), in which the adeninate ion chelates the metal center through the N(6) and N(7) atoms. Complex 4b is quantitatively obtained when 1b reacts with 9-MeAd in DMSO and can be easily isolated if the reaction is carried out in CH(2)Cl(2). In CH(3)CN solution, at room temperature, 4b slowly converts into 3b indicating that the insertion of acetonitrile is a reversible process. A similar metal-mediated coupling reaction occurs when 1a,b react with 1-methylcytosine (1-MeCy) in CH(3)CN. The resulting complexes, cis-[L(2)PtNH=C(Me)[1-MeCy(-2H)]]NO3, (L = PMePh2, 5a and PPh3, 5b), contain the deprotonated form of the ligand N-(1-methyl-2-oxo-2,3-dihydro-1H-pyrimidin-4-ylidene)-acetamidine. The X-ray analysis of 5a shows the coordination of the metal at the N(3) site of the pyrimidine cycle and to the nitrogen atom of the acetonitrile, with features of the six-membered metallocycle only slightly different from those found in 3a and 3b. In CD3CN/CH3(13)CN solution complexes 5a,b undergo exchange of the inserted nitrile, while in DMSO or chlorinated solvents they irreversibly release CH3CN to form species not yet fully characterized. No insertion of CH3CN occurs when the hydroxo complexes are stabilized by PMe3 and PMe2Ph.
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Affiliation(s)
- Bruno Longato
- Istituto di Scienze e Tecnologie Molecolari-CNR, c/o Dipartimento di Scienze Chimiche, Universita' di Padova, Italy.
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Makarycheva-Mikhailova AV, Selivanov SI, Bokach NA, Kukushkin VY, Kelly PF, Pombeiro AJL. Nucleophilic addition of bifunctional sulfimidosulfides to platinum(IV)-coordinated nitriles. Russ Chem Bull 2004. [DOI: 10.1007/s11172-005-0017-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Amantia D, Price C, Shipman MA, Elsegood MRJ, Clegg W, Houlton A. Minor groove site coordination of adenine by platinum group metal ions: effects on basicity, base pairing, and electronic structure. Inorg Chem 2003; 42:3047-56. [PMID: 12716200 DOI: 10.1021/ic020657g] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dithioether- or diamine-tethered adenine derivatives react with Pt(II), Pd(II), and Rh(III) ions to give N3-coordinated complexes of the types [MCl(SSN)](+) (M = Pt or Pd), [RhCl(3)(SSN)], or [RhCl(3)(NNN)] (where SSN = 1-(N9-adenine)-3,6-dithia-heptane or 1-(N9-adenine)-4,7-dithia-octane; NNN = ethylenediamine-N,9-ethyladenine). Single-crystal X-ray analysis confirms the nature of the metal-nucleobase interaction and highlights a conserved intermolecular hydrogen-bonding motif for all the complexes, irrespective of the metal-ion geometry. Coordination significantly reduces the basicity of the adeninyl group, as indicated by a pK(a) value of -0.16 for [PtCl(N3-1-(N9-adenine)-3,6-dithia-heptane)]BF(4), compared to a pK(a) value of 4.2 for 9-ethyladenine. The site of proton binding, N1 or N7, could not be unambiguously assigned from the (1)H NMR data, because of the similar effect on the chemical shifts of the H2 and H8 protons. Density functional calculations at the BP-LACVP level suggest N1 as the site of protonation for this type of complex. This is in contrast to the N7-protonation reported for [Pt(dien)(N3-6,6',9-trimethyladenine)](2+), as reported elsewhere (Meiser et al., Chem.-Eur. J. 1997, 3, 388). However, further electronic structure calculations in the gas phase reveal that the preferred site for protonation for N3-bound complexes is conformationally dependent. N3 coordination was also found to reduce the extent of base pairing between adenine and thymine in dimethylsulfoxide for the self-complementary complex [PtCl(L3)](+) (L3 = 1-(N9-adenine)-3,6-dithia-9-(N1-thymine)nonane), compared to that for the uncomplexed ligand.
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Affiliation(s)
- David Amantia
- School of Natural Sciences: Chemistry, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, U.K
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Banerjee SR, Wei L, Levadala MK, Lazarova N, Golub VO, O'Connor CJ, Stephenson KA, Valliant JF, Babich JW, Zubieta J. [Re(III)Cl(3)] core complexes with bifunctional single amino acid chelates. Inorg Chem 2002; 41:5795-802. [PMID: 12401085 DOI: 10.1021/ic020391d] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reactions of the Re(V) starting material [ReO(PPh(3))(2)Cl(3)] with ligands of the type XN(Y)Z [X = Y = 2-pyridylmethyl, Z = -CH(2)CO(2)Et (L(1)Et), -CH(2)CH(2)CO(2)Et (L(2)Et), -CH(2)CH(2)CH(2)CH(2)CH(NHCO(2)Bu(t))CO(2)H (L(3)H); X = 2-pyridylmethyl, Y = 2-(1-methylimidazolyl)methyl, Z = -CH(2)CO(2)Et (L(4)Et)] yielded the Re(III) trichloride complexes of the type [ReCl(3)(L(n)R)]. The complexes are mononuclear, paramagnetic species with a facial geometry of the chloride ligands. The nitrogen donors of the tridentate L(n)()R ligands complete the distorted octahedral coordination spheres of the complexes. Crystal data: [ReCl(3)(L(1)Et)] (1), monoclinic, C2/m, a = 16.088(3) A, b = 9.980(2) A, c = 12.829(2) A, beta = 91.384(3) degrees, Z = 4, D(calc) = 1.967 g/cm(-)(3); [ReCl(3)(L(4)Et)] (4), monoclinic, C2/c, a = 22.880(1) A, b = 7.4926(4) A, c = 22.560(1) A, beta = 94.186(1) degrees, Z = 8, D(calc) = 2.001 g/cm(-3).
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Affiliation(s)
- Vadim Yu Kukushkin
- Department of Chemistry, St. Petersburg State University, 198504 Stary Petergof, Russian Federation.
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Majumdar P, Falvello LR, Tomás M, Goswami S. A novel dinuclear ruthenium complex bridged through a substituted phenazine ligand formed by ruthenium-promoted oxidative assembly of 1,3-diaminobenzene. Chemistry 2001; 7:5222-8. [PMID: 11775696 DOI: 10.1002/1521-3765(20011203)7:23<5222::aid-chem5222>3.0.co;2-t] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The reaction of [Ru(acac)3] (acac = acetylacetonate) with molten 1,3-diaminobenzene affords the crystalline monometallic compound [Ru(L1)-(acac)21 (1: L1 = N-(3'-aminophenyl)1,2-(3-amino)benzoquinone diimine) along with an unstable dimetallic compound [Ru2(mu-L2)(acac)4] (2: L2=N-4,6-bis(3'-aminophenyl)imino-3,5-diimino-hex-1-ene). Compound 2 transforms to a stable dimetallic compound [Ru2(mu-L3)(acac)4] (3: L3 = 2-amino-6(3'-aminophenyl)imino-9-imino-phenazine) in boiling 2-methoxyethanol. The above compounds are formed by ruthenium-mediated oxidative di- or trimerization of the diamine with the formation of several new C-N bonds. The products have been thoroughly characterized. FAB mass spectra, along with other physicochemical data, were used for their formulations. The compounds 1, 2, and 3 display intense peaks due to their parent molecular ions at m/z 512, 916, and 914, respectively. Final characterization of complex 3 was made by single-crystal X-ray structure determination. The structure of 3 confirmed the formation of three new C-N bonds and the bridging ligand L3 from 1,3-diaminobenzene. The conversion, 2 --> 3 is an oxidative ring-closure reaction, which is associated with dehydrogenation reactions. The monometallic compound 1, showed a reversible metal-based anodic response at 0.35 V. On the other hand, both the compounds 2 and 3 showed a pair of well-resolved metal-based anodic oxidations, for which the separation between the two successive anodic responses were high (>0.4 V). In addition, all of them showed multiple cathodic responses that were in the range -1.0 to -2.0 V.
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Affiliation(s)
- P Majumdar
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata
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Rakowski DuBois M, Vasquez LD, Peslherbe L, Noll BC. Regioselective Electrophilic Substitution and Addition Reactions at an N-Coordinated Pyrrolyl Ligand in (PMe2Ph)3Cl2Re(NC4H4). Organometallics 1999. [DOI: 10.1021/om9900216] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Rakowski DuBois
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309
| | - Lisa D. Vasquez
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309
| | - L. Peslherbe
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309
| | - B. C. Noll
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309
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Kukushkin VY, Pakhomova TB, Kukushkin YN, Herrmann R, Wagner G, Pombeiro AJL. Iminoacylation. 1. Addition of Ketoximes or Aldoximes to Platinum(IV)-Bound Organonitriles. Inorg Chem 1998; 37:6511-6517. [PMID: 11670772 DOI: 10.1021/ic9807745] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The metal-mediated iminoacylation reaction of ketoximes or aldoximes upon treatment with the organonitrile platinum(IV) complexes trans-[PtCl(4)(RCN)(2)] proceeds under relatively mild conditions in acetonitrile (R = Me) or in chloroform (R = CH(2)Ph, Ph) to give trans-[PtCl(4)(NH=C(R)ON=CR(1)R(2))(2)] (R(1) = R(2) = Me; R(1)R(2) = C(4)H(8), R(1)R(2) = C(5)H(10), R(1)R(2) = (H)Ph, R(1)R(2) = (H)C(6)H(4)(OH)-o; 1-14) in 90-95% yield. All these compounds were characterized by elemental analyses (C, H, N, Cl, Pt), FAB mass spectrometry, and IR and (1)H, (13)C{(1)H}, and (195)Pt NMR spectroscopies. X-ray structure determinations of [PtCl(4)(NH=C(Me)ON=CMe(2))(2)] (1) and [PtCl(4){NH=C(Me)ON=C(C(5)H(10))}(2)] (3) disclosed their overall trans-configuration and the amidine one-end rather than N,N-bidentate coordination mode of the N-donor ligands. The iminoacyl species are in E-conformation which is held by a rather weak N-H.N hydrogen bond between the amidine =NH atom and the oxime nitrogen with the following observed distances and angles for 1 and [3]: N(1).N(2), and N(1)-H, N(1)H.N(2) are 2.605 [2.592], 0.74 [0.71], and 2.20 [2.25] Å; N(1)-H.N(2) is 115 degrees [111 degrees ]. No evidence of the Z-conformation in solution was obtained by NMR spectroscopy. Compounds trans-[PtCl(4)(NH=C(R)ON=CR(1)R(2))(2)] are unexpectedly stable toward hydrolysis both in the solid state and in solutions.
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Affiliation(s)
- Vadim Yu. Kukushkin
- Department of Chemistry, St. Petersburg State University, 198904 Stary Petergof, Russian Federation, Inorganic Chemistry, St. Petersburg State Technological Institute, Zagorodny Pr. 49, 198013 St. Petersburg, Russian Federation, and Complexo I, Instituto Supérior Técnico, Av. Rovisco Pais, 1096 Lisbon Codex, Portugal
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Prater ME, Mindiola DJ, Ouyang X, Dunbar KR. A quadruply-bonded dirhenium complex bridged by two N1/N6 adenate ligands. INORG CHEM COMMUN 1998. [DOI: 10.1016/s1387-7003(98)00127-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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