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Verma I, Mukhopadhyay N, Sengupta A, Mukherjee R. Arylamination via ortho-fusion on an azo-appended pyridine carboxamide complex of copper(II). J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.122121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Desnoyer AN, Love JA. Recent advances in well-defined, late transition metal complexes that make and/or break C-N, C-O and C-S bonds. Chem Soc Rev 2018; 46:197-238. [PMID: 27849097 DOI: 10.1039/c6cs00150e] [Citation(s) in RCA: 122] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Chemical transformations that result in either the formation or cleavage of carbon-heteroatom bonds are among the most important processes in the chemical sciences. Herein, we present a review on the reactivity of well-defined, late-transition metal complexes that result in the making and breaking of C-N, C-O and C-S bonds via fundamental organometallic reactions, i.e. oxidative addition, reductive elimination, insertion and elimination reactions. When appropriate, emphasis is placed on structural and spectroscopic characterization techniques, as well as mechanistic data.
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Affiliation(s)
- Addison N Desnoyer
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
| | - Jennifer A Love
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
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Roy SK, Sengupta D, Rath SP, Saha T, Samanta S, Goswami S. Role of Mediator and Effects of Temperature on ortho-C-N Bond Fusion Reactions of Aniline Using Ruthenium Templates: Isolation and Characterization of New Ruthenium Complexes of the in-Situ-Generated Ligands. Inorg Chem 2017; 56:4966-4977. [PMID: 28426213 DOI: 10.1021/acs.inorgchem.6b03163] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, ortho-C-N bond fusion reactions of aniline are followed by the use of two different ruthenium mediators. Reaction of aniline with [RuIII(terpy)Cl3] (terpy = 2,2':6',2″-terpyridine) resulted in a trans bis-aniline ruthenium(II) complex [1]+ which upon oxidation with H2O2 produced compound [2]+ of a bidentate ligand, N-phenyl-1,2-benzoquinonediimine, due to an oxidative ortho-C-N bond fusion reaction. Complex [1]+ and aniline (neat) at 185 °C produced a bis-chelated ruthenium complex (3). A previously reported complex [RuII(N-phenyl-1,2-benzoquinonediimine)(aniline)2(Cl)2] (5) undergoes similar oxidation by air at 185 °C to produce complex [3]. A separate chemical reaction between aniline and strongly oxidizing tetra-n-propylammonium perruthenate [(n-pr)4N]+[RuO4]- in air produced a ruthenium complex [4] of a N4-tetraamidophenylmacrocycle ligand via multiple ortho-C-N bond fusion reaction. Notably, the yield of this product is low (5%) at 100 °C but increases to 25% in refluxing aniline. All these complexes are characterized fully by their physicochemical characterizations and X-ray structure determination. From their structural parameters and other spectroscopic studies, complex [2]+ is assigned as [RuII(terpy)(N-phenyl-1,2-benzoquinonediimine)(Cl)]+ whereas complex [4] is described as a ruthenium(VI) complex comprised of a reduced deprotonated N-phenyl-1,2-diamidobenzene and N4-tetraamidophenylmacrocyclic ligand. Complex [2]+ exhibits one reversible oxidation at 1.32 V and one reversible reduction at -0.75 V vs Ag/AgCl reference electrode. EPR of the electrogenerated complexes has revealed that the oxidized complex is a ruthenium(III) complex with an axial EPR spectrum at gav= 2.06. The reduced complex [2], on the other hand, shows a single-line EPR signal at gav= 1.998. In contrast, complex [4] shows two successive one-electron oxidation waves at 0.5 and 0.8 V and an irreversible reduction wave at -0.9 V. EPR studies of the oxidized complexes [4]+ and [4]2+ reveal that oxidations are ligand centered. DFT calculations were employed to elucidate the electronic structures as well as the redox processes associated with the above complexes. Aerial ortho-C-N bond fusion reactions of aniline using two different mediators, viz. [RuIII(terpy)Cl3] and [(n-pr)4N]+[RuO4]-, have been followed. It is found that in the case of oxidizable Ru(III) mediator complex, C-N bond fusion is limited only to dimerization reaction whereas the high-valent Ru(VII) salt mediates multiple C-N bond fusion reactions leading to the formation of a novel tetradentate N4-tetraamidophenylmacrocyclic ligand. Valence ambiguity in the complexes of the resultant redox-active ligands is scrutinized.
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Affiliation(s)
- Suman K Roy
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science , Kolkata 700 032, India
| | - Debabrata Sengupta
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science , Kolkata 700 032, India
| | - Santi Prasad Rath
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science , Kolkata 700 032, India
| | - Tanushri Saha
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science , Kolkata 700 032, India
| | - Subhas Samanta
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur , Nadia 741246, India
| | - Sreebrata Goswami
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science , Kolkata 700 032, India
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Roy SK, Samanta S, Sinan M, Ghosh P, Goswami S. Aerial Oxidation of Protonated Aromatic Amines. Isolation, X-ray Structure, and Redox and Spectral Characteristics of N- Containing Dyes. J Org Chem 2012; 77:10249-59. [DOI: 10.1021/jo3019126] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Suman K Roy
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata
700 032, India
| | - Subhas Samanta
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata
700 032, India
| | - Mominul Sinan
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata
700 032, India
| | - Pradip Ghosh
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata
700 032, India
| | - Sreebrata Goswami
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata
700 032, India
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Mandal S, Samanta S, Mondal TK, Goswami S. Comparative Study on ortho-C–H vs ortho-C–X (X = C, Cl, S) Bond Activation in ortho-Caromatic–N Bond Fusion in Substituted Anilines Using Ruthenium(II) Mediators: Isolation and Characterization of Unusual Ru2 Complexes. Organometallics 2012. [DOI: 10.1021/om300241y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sutanuva Mandal
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata 700 032, India
| | - Subhas Samanta
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata 700 032, India
| | - Tapan K. Mondal
- Department of Chemistry, Jadavpur University, Kolkata, 700032, India
| | - Sreebrata Goswami
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata 700 032, India
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Hounjet LJ, McDonald R, Ferguson MJ, Cowie M. Comparison of Structure and Reactivity of Phosphine-Amido and Hemilabile Phosphine-Amine Chelates of Rhodium. Inorg Chem 2011; 50:5361-78. [DOI: 10.1021/ic101883u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lindsay J. Hounjet
- Department of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Robert McDonald
- Department of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Michael J. Ferguson
- Department of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Martin Cowie
- Department of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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Samanta S, Goswami S. Tuning of the o-Carom−N Bond-Formation Reactivity of Aniline Using Ruthenium(II) Templates. Inorg Chem 2011; 50:3171-3. [DOI: 10.1021/ic101868w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Subhas Samanta
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Sreebrata Goswami
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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Warren JJ, Tronic TA, Mayer JM. Thermochemistry of proton-coupled electron transfer reagents and its implications. Chem Rev 2010; 110:6961-7001. [PMID: 20925411 PMCID: PMC3006073 DOI: 10.1021/cr100085k] [Citation(s) in RCA: 1192] [Impact Index Per Article: 85.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jeffrey J. Warren
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700
| | - Tristan A. Tronic
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700
| | - James M. Mayer
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700
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Bolaño T, Buil ML, Esteruelas MA, Izquierdo S, Lalrempuia R, Oliván M, Oñate E. C−C Bond Activation of the NHC Ligand of an Osmium−Amido Complex. Organometallics 2010. [DOI: 10.1021/om100684a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tamara Bolaño
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - María L. Buil
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Miguel A. Esteruelas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Susana Izquierdo
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Ralte Lalrempuia
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Montserrat Oliván
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
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Harrison DJ, Fekl U. Catalytic production of sulfur heterocycles (dihydrobenzodithiins): a new application of ligand-based alkene reactivity. Chem Commun (Camb) 2009:7572-4. [DOI: 10.1039/b915614c] [Citation(s) in RCA: 18] [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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Samanta S, Goswami S. Regioselective Knitting of Aniline via ortho-C−N Bond Fusion Using OsO4 as a Template. J Am Chem Soc 2008; 131:924-5. [DOI: 10.1021/ja808901s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Subhas Samanta
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Sreebrata Goswami
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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Samanta S, Adak L, Jana R, Mostafa G, Tuononen HM, Ranu BC, Goswami S. Oxidative ortho-C-N Fusion of Aniline by OsO4. Isolation, Characterization of Oxo-Amido Osmium(VI) Complexes, and their Catalytic Activities for Oxidative C−C Bond Cleavage of Unsaturated Hydrocarbons. Inorg Chem 2008; 47:11062-70. [DOI: 10.1021/ic801352d] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Subhas Samanta
- Department of Inorganic Chemistry and Department of Organic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Physics, Jadavpur University, Kolkata 700 032, India, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
| | - Laksmikanta Adak
- Department of Inorganic Chemistry and Department of Organic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Physics, Jadavpur University, Kolkata 700 032, India, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
| | - Ranjan Jana
- Department of Inorganic Chemistry and Department of Organic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Physics, Jadavpur University, Kolkata 700 032, India, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
| | - Golam Mostafa
- Department of Inorganic Chemistry and Department of Organic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Physics, Jadavpur University, Kolkata 700 032, India, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
| | - Heikki M. Tuononen
- Department of Inorganic Chemistry and Department of Organic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Physics, Jadavpur University, Kolkata 700 032, India, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
| | - Brindaban C. Ranu
- Department of Inorganic Chemistry and Department of Organic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Physics, Jadavpur University, Kolkata 700 032, India, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
| | - Sreebrata Goswami
- Department of Inorganic Chemistry and Department of Organic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Physics, Jadavpur University, Kolkata 700 032, India, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
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Castro-Rodrigo R, Esteruelas MA, López AM, Oñate E. Reactions of a Dihydrogen Complex with Terminal Alkynes: Formation of Osmium−Carbyne and −Carbene Derivatives with the Hydridotris(pyrazolyl)borate Ligand. Organometallics 2008. [DOI: 10.1021/om800248e] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ruth Castro-Rodrigo
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Miguel A. Esteruelas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Ana M. López
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
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Knight JD, Kramp CR, Hilton EJ, Vella JH, Grant BJ, Hajiaghamohseni LM, Meierhoefer MA, Dunn SP, Walters MJ, Overby JS, Metz CR, Pennington WT, VanDerveer DG, Beam CF. Synthesis of NH-, 2 H-4,5-Dihydrobenz[ g]inazoles and Related Compounds from 1-Tetralone Carbomethoxyhydrazones and Aromatic Esters. Ind Eng Chem Res 2007. [DOI: 10.1021/ie070760j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John D. Knight
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Catherine R. Kramp
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Ebony J. Hilton
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Jarrett H. Vella
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Bonnie J. Grant
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Laela M. Hajiaghamohseni
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Michelle A. Meierhoefer
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - S. Patrick Dunn
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Matthew J. Walters
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Jason S. Overby
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Clyde R. Metz
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - William T. Pennington
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Donald G. VanDerveer
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
| | - Charles F. Beam
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, and Department of Chemistry, Clemson University, Clemson, South Carolina 29634
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Shishkin VN, Kudrik EV, Makarov SV, Shaposhnikov GP. Cobalt 4-octasulfophenyltetrapyrazinoporphyrazine as a catalyst for the oxidation of organic substrates with atmospheric oxygen. KINETICS AND CATALYSIS 2007. [DOI: 10.1134/s0023158407050102] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Castro-Rodrigo R, Esteruelas MA, López AM, Oliván M, Oñate E. Preparation, Spectroscopic Characterization, X-ray Structure, and Theoretical Investigation of Hydride−, Dihydrogen−, and Acetone−OsTp Complexes: A Hydridotris(pyrazolyl)borate−Cyclopentadienyl Comparison. Organometallics 2007. [DOI: 10.1021/om700480t] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ruth Castro-Rodrigo
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Miguel A. Esteruelas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Ana M. López
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Montserrat Oliván
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
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Panda M, Das S, Mostafa G, Castineiras A, Goswami S. Platinum complexes of diazo ligands. Studies of regioselective aromatic ring amination, oxidative halogen addition and reductive halogen elimination reactions. Dalton Trans 2005:1249-55. [PMID: 15782261 DOI: 10.1039/b418470j] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2-(Arylazo)pyridine ligands, L1a-1c react with the salt K2[PtCl4] to give the mononuclear complexes [PtCl2(L1)](1), which readily react with ArNH2 to yield the monochloro complexes of type [PtCl(L2)](HL2= 2-[(2-(arylamino)phenyl)azo]pyridine)(2) via regioselective ortho-amine fusion at the pendent aryl ring of coordinated L1. Oxidative addition of the electrophiles Y2(Y = Cl, Br, I) to the square-planar platinum(II) complex, has led to syntheses of the corresponding octahedral platinum(IV) complexes, [PtY3(L2)](3) in high yields. Ascorbate ion reductions of the platinum(IV) complexes, , resulted in reductive halogen elimination to revert to the platinum(II) complexes almost quantitatively. Isolation of products and X-ray structure determination of the representative complexes followed all these chemical reactions. In crystal packing, the compound [PtCl2(L1c)](1c) forms dimeric units with a Pt...Pt distance of 3.699(1) A. In contrast, the crystal packing of 2b revealed that the molecules are arranged in an antiparallel fashion to form a noncovalent 1D chain to accommodate pi(aryl)-pi(pyridyl) and Pt-pi(aryl) interactions. Notably, the oxidation of [Pt(II)Cl(L2a)](2a) by I2 produced a mixed halide complex [Pt(IV)ClI2(L2a)](5), which, in turn, is reduced by ascorbate ion to produce [Pt(II)I(L2a)] with the elimination of ClI. All the platinum(II) complexes are brown, the platinum(IV) complexes, on the other hand, are green. Low-energy visible range transitions in the complexes of the extended ligand [L2]- are ascribed to ligand basedpi-pi* transitions. Cyclic voltammetric behaviour of the complexes is reported.
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Affiliation(s)
- Manashi Panda
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, 700 032, India
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