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Sinha NK, Mishra V, Thirupathi N. Influence of the Steric/Electronic Properties of N-Aryl Substituents in Cycloplatinated Guanidinate(1-) Complexes on the Formation of Discrete Pt → Ag Complexes and One-Dimensional Coordination Polymer. Inorg Chem 2023; 62:7644-7661. [PMID: 37129511 DOI: 10.1021/acs.inorgchem.2c04172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The reactions of cycloplatinated guanidinate(1-) complexes 1-6 with AgTFA (TFA = OC(O)CF3) in 1:1 and 1:2 PtII/AgI molar ratios afforded complexes containing three types of Pt2Ag2 skeletons (7-10, 11, and 13), one 1D CP containing Pt2Ag3 skeleton (16), and a Pt2Ag4 complex (17) in 91-95% (method 1), 73-82% (method 2) (7-10), and 54-79% (11, 13, 16, and 17) yields. The reactions of 11 with 2,6-XylNC (2,6-Xyl = 2,6-Me2C6H3) and 4-DMAP (4-dimethylaminopyridine) gave a neutral complex 18 and an ionic complex 19, respectively. Molecular structures of 12 complexes were unambiguously determined by single-crystal X-ray diffraction. Ten complexes contain unprecedented PtAg skeletons and are shown to contain multiple number of dative Pt → Ag bonds supported by the TFA ligand, platinated carbon of the TAG ligand, or both these ligands in conjunction with the Ag-Ag contacts stabilized by argentophilic interaction. Further, the new complexes were characterized by analytical, IR, and multinuclear NMR (19F, 1H, 13C{1H}, and 195Pt) spectroscopies, powder X-ray diffraction, and TGA/DTA. In solution, 9 and 19 exist in more than one form as identified by multinuclear NMR, and this behavior is ascribed to the restricted (N2)C-N(H)Ar single-bond rotation of the TAG ligand. The photophysical properties of 9 and 11 are reported.
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Affiliation(s)
| | - Vishwesh Mishra
- Department of Chemistry, University of Delhi, Delhi 110 007, India
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2
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Carrillo-Hermosilla F, Fernández-Galán R, Ramos A, Elorriaga D. Guanidinates as Alternative Ligands for Organometallic Complexes. Molecules 2022; 27:molecules27185962. [PMID: 36144698 PMCID: PMC9501388 DOI: 10.3390/molecules27185962] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/06/2022] [Accepted: 09/07/2022] [Indexed: 11/30/2022] Open
Abstract
For decades, ligands such as phosphanes or cyclopentadienyl ring derivatives have dominated Coordination and Organometallic Chemistry. At the same time, alternative compounds have emerged that could compete either for a more practical and accessible synthesis or for greater control of steric and electronic properties. Guanidines, nitrogen-rich compounds, appear as one such potential alternatives as ligands or proligands. In addition to occurring in a plethora of natural compounds, and thus in compounds of pharmacological use, guanidines allow a wide variety of coordination modes to different metal centers along the periodic table, with their monoanionic chelate derivatives being the most common. In this review, we focused on the organometallic chemistry of guanidinato compounds, discussing selected examples of coordination modes, reactivity and uses in catalysis or materials science. We believe that these amazing ligands offer a new promise in Organometallic Chemistry.
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Thakur V, Thirupathi N. Reactivity studies of cycloplatinated triarylguanidinato complexes, [Pt(TAG-κC,κN)(X)(S(O)Me2)] (X = Cl and OC(O)CF3) towards Lewis bases, and structural aspects of the products⊕. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Babahan İ, Fırıncı R, Özdemir N, Emin Günay M. Synthesis, characterization and catalytic activity of N-heterocyclic carbene ligated Schiff base palladacycles. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Francos J, Cadierno V. The chemistry of guanidinate complexes of the platinum group metals. Dalton Trans 2019; 48:9021-9036. [PMID: 31120072 DOI: 10.1039/c9dt01289c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
In this Perspective article, recent advances in the chemistry of platinum group metal complexes containing mono- and dianionic guanidinate ligands, i.e. [(RN)2C-NR2]- and [(RN)2C[double bond, length as m-dash]NR]2-, respectively, are presented. Synthetic and structural aspects, reactivity studies, and applications of these compounds are discussed.
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Affiliation(s)
- Javier Francos
- Laboratorio de Compuestos Organometálicos y Catálisis (Unidad Asociada al CSIC), Centro de Innovación en Química Avanzada (ORFEO-CINQA), Departamento de Química Orgánica e Inorgánica, IUQOEM, Facultad de Química, Universidad de Oviedo, Julián Clavería 8, E-33006 Oviedo, Spain.
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Saxena P, Thomas JM, Sivasankar C, Thirupathi N. Syntheses and structural aspects of six-membered palladacyclic complexes derived fromN,N′,N′′-triarylguanidines with N- or S-thiocyanate ligands. NEW J CHEM 2019. [DOI: 10.1039/c8nj04167a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Linkage isomers8·2/3PhMe and9·MeOH were synthesized, isolated and structurally characterized by SCXRD and the role of solvent of crystallization in the formation of these linkage isomers identified.
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Affiliation(s)
- Priya Saxena
- Department of Chemistry
- University of Delhi
- Delhi 110 007
- India
| | - Jisha Mary Thomas
- Department of Chemistry
- School of Physical, Chemical and Applied Sciences
- Pondicherry University
- Puducherry 605 014
- India
| | - Chinnappan Sivasankar
- Department of Chemistry
- School of Physical, Chemical and Applied Sciences
- Pondicherry University
- Puducherry 605 014
- India
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Elumalai P, Ujjval R, Nethaji M, Thirupathi N. Syntheses, characterization, solution behavior and catalytic activity of trans-[(guanidine)2PdX2] (X = Cl and OC(O)R; R = Me, Ph and Bu) in Heck–Mizoroki coupling reactions involving chloroarenes/methyl acrylate. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.05.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Mishra V, Thirupathi N. Critical Role of Anions in Platinum(II) Precursors upon the Structural Motifs of Six-Membered Cycloplatinated N, N', N″-Triarylguanidines. ACS OMEGA 2018; 3:6075-6090. [PMID: 31458795 PMCID: PMC6644913 DOI: 10.1021/acsomega.8b00782] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Accepted: 05/24/2018] [Indexed: 05/20/2023]
Abstract
The reactions of cis-[Pt(OAc)2(DMSO)2] with 2 equiv of sym N,N',N″-triarylguanidines, [ArN=C(NHAr)2], in toluene under reflux condition for 8 h afforded six-membered cycloplatinated guanidines, [Pt{κ2(C,N)}(OAc){κ1 N(ArN=C(NHAr)2)}] [sym = symmetrical; Ar = 2-MeC6H4 (1) and 2,4-Me2C6H3 (2)], in 82 and 84% yields, respectively. The salt metathesis reaction of 1 with 1 equiv of AgTFA in CH2Cl2 at room temperature (RT) afforded [Pt{κ2(C,N)}(TFA){κ1 N(ArN=C(NHAr)2)}] (3) in 94% yield. The reaction of cis-[Pt(TFA)2(DMSO)2] with 1 equiv of [ArN=C(NHAr)2] in toluene under reflux condition for 8 h afforded six-membered cycloplatinated guanidines, [Pt{κ2(C,N)}(TFA)(DMSO)] [Ar = 2-MeC6H4 (4), 4-MeC6H4 (5), 2,4-Me2C6H3 (6), and 2-(MeO)C6H4 (7)], in ≥73% yields. The reaction of trans-[PtCl2(PhCN)2] with 2 equiv of [ArN=C(NHAr)2] in toluene under reflux condition for 48 h afforded trans-[PtCl2{ArN=C(NHAr)2}2] [Ar = 2-MeC6H4 (8) and 2,4-Me2C6H3 (9)] in 90 and 45% yields, respectively. Complexes 8 and 9 were separately refluxed in MeOH for 8 h to afford six-membered cycloplatinated guanidines, [Pt{κ2(C,N)}(μ-Cl)]2 (10 and 11), in 93 and 96% yields, respectively, with concomitant formation of the respective guanidinium salts, [(ArNH)3C]Cl, as the byproduct. Platinacycle 10 was treated with 2 equiv of AgTFA in CH2Cl2 at RT to afford six-membered cycloplatinated guanidine, [Pt{κ2(C,N)}(μ-TFA)]2 (12), in 94% yield. The new compounds were characterized by analytical techniques and multinuclear NMR (1H, 13C, and 195Pt) spectroscopy, and further, molecular structures of 10 compounds were determined by single-crystal X-ray diffraction. The structural motif in 1·1/2CH2Cl2 and 3 is novel in that it contains a planar six-membered [Pt{κ2(C,N)}] unit and a nonplanar eight-membered [Pt{κ2(N,O)}] ring, wherein OAc and the guanidine ligands are linked through a N-H···O hydrogen bond. The six-membered cycloplatinated structural motifs present in 10/11·C7H8 and 12·CH2Cl2 are also unprecedented in the literature. The number and nature of solution species of new complexes were unambiguously investigated by detailed NMR studies. The critical role of anions in Pt(II) precursors upon the course of cycloplatination and thus the motifs in the products were addressed. Plausible mechanisms of cycloplatination reactions are discussed.
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Synthesis of a novel six membered CNS palladacycle; TD-DFT study and catalytic activity towards microwave-assisted selective oxidation of terminal olefin to aldehyde. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.08.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Agarwal P, Thomas JM, Sivasankar C, Nethaji M, Thirupathi N. Six-membered cyclopalladated N,N′,N″-triarylguanidines, [{κ2(C,N)Pd}2(μ-OAc)(μ-Pz)], [κ2(C,N)Pd(μ-Pz)]2 and a novel [AgNO3⊂{{κ2(C,N)Pd}2(μ-NO3)(μ-Pz)}]: Syntheses, reactivity studies, structural aspects, and solution behavior. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.07.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Agarwal P, Thirupathi N, Nethaji M. Syntheses, Structural Aspects, Solution Behavior, and Catalytic Utility of Cyclopalladated N,N′,N″-Triarylguanidines [κ2(C,N))Pd(Pyrazole)2X] (X = Br, OC(O)CF3, and PF6) in Suzuki–Miyaura Coupling Reactions of Aryl Bromides. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00442] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pallavi Agarwal
- Department
of Chemistry, University of Delhi, Delhi 110 007, India
| | | | - Munirathinam Nethaji
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bengaluru 560 012, India
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12
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Gayakhe V, Ardhapure A, Kapdi AR, Sanghvi YS, Serrano JL, García L, Pérez J, García J, Sánchez G, Fischer C, Schulzke C. Water-Soluble Pd–Imidate Complexes: Broadly Applicable Catalysts for the Synthesis of Chemically Modified Nucleosides via Pd-Catalyzed Cross-Coupling. J Org Chem 2016; 81:2713-29. [DOI: 10.1021/acs.joc.5b02475] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vijay Gayakhe
- Institute of Chemical Technology, Mumbai Nathalal Road, Matunga, Mumbai 400019, India
| | - Ajaykumar Ardhapure
- Institute of Chemical Technology, Mumbai Nathalal Road, Matunga, Mumbai 400019, India
| | - Anant R. Kapdi
- Institute of Chemical Technology, Mumbai Nathalal Road, Matunga, Mumbai 400019, India
| | - Yogesh S. Sanghvi
- Rasayan, Inc. 2802 Crystal Ridge Road, Encinitas, California 92024-6615, United States
| | - Jose Luis Serrano
- Departamento
de Ingeniería
Minera, Geológica y Cartográfica, Universidad Politécnica
de Cartagena, Área de Química Inorgánica, Regional
Campus of International Excellence “Campus Mare Nostrum”, Universidad Politécnica de Cartagena, 30203 Cartagena, Spain
| | - Luis García
- Departamento
de Ingeniería
Minera, Geológica y Cartográfica, Universidad Politécnica
de Cartagena, Área de Química Inorgánica, Regional
Campus of International Excellence “Campus Mare Nostrum”, Universidad Politécnica de Cartagena, 30203 Cartagena, Spain
| | - Jose Pérez
- Departamento
de Ingeniería
Minera, Geológica y Cartográfica, Universidad Politécnica
de Cartagena, Área de Química Inorgánica, Regional
Campus of International Excellence “Campus Mare Nostrum”, Universidad Politécnica de Cartagena, 30203 Cartagena, Spain
| | - Joaquím García
- Departamento de Química
Inorgánica, Regional Campus of International Excellence “Campus
Mare Nostrum”, Universidad de Murcia, 30071 Murcia, Spain
| | - Gregorio Sánchez
- Departamento de Química
Inorgánica, Regional Campus of International Excellence “Campus
Mare Nostrum”, Universidad de Murcia, 30071 Murcia, Spain
| | - Christian Fischer
- Ernst-Moritz-Arndt-Universität
Greifswald, Institut für Biochemie, Felix-Hausdorff-Strasse 4, 17489 Greifswald, Germany
| | - Carola Schulzke
- Ernst-Moritz-Arndt-Universität
Greifswald, Institut für Biochemie, Felix-Hausdorff-Strasse 4, 17489 Greifswald, Germany
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13
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Saxena P, Thirupathi N, Nethaji M. Depalladation of Neutral Monoalkyne- and Dialkyne-Inserted Palladacycles and Alkyne Insertion/Depalladation Reactions of Cationic Palladacycles Derived from N,N′,N″-Triarylguanidines as Facile Routes for Guanidine-Containing Heterocycles/Carbocycles: Synthetic, Structural, and Mechanistic Aspects. Organometallics 2014. [DOI: 10.1021/om500837v] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Priya Saxena
- Department
of Chemistry, University of Delhi, Delhi 110 007, India
| | | | - Munirathinam Nethaji
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
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14
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Saxena P, Thirupathi N, Nethaji M. Mono- and Dialkyne Insertion Reactions of Cyclopalladated N,N′,N″-Triarylguanidines [κ2(C,N)Pd(μ-Br)]2 and cis-/trans-[κ2(C,N)Pd(Lewis Base)Br]. Scaffolds for Enlarged, Rearranged, and Zwitterionic Palladacycles through Ring Contraction cum Amine–Imine Tautomerization. Organometallics 2014. [DOI: 10.1021/om500423q] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Priya Saxena
- Department of Chemistry, University of Delhi, Delhi 110 007, India
| | | | - Munirathinam Nethaji
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
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Saxena P, Thirupathi N, Nethaji M. Insertion Reactions of Six-Membered Cyclopalladated N,N′,N″-Triarylguanidine, [Pd{κ2(C,N)-C6H3Me-3(NHC(NHAr)(═NAr))-2}(μ-Br)]2 (Ar = 2-MeC6H4) with PhC≡C—C(O)OR (R = Me and Et): A Gateway to Second Orthopalladation through Novel Rearrangements. Organometallics 2013. [DOI: 10.1021/om4010719] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Priya Saxena
- Department
of Chemistry, University of Delhi, Delhi 110 007, India
| | | | - Munirathinam Nethaji
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, Karnataka, India
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Elumalai P, Thirupathi N, Nethaji M. Six-membered [C,N] cyclopalladated sym N,N′,N″-tri(4-tolyl)guanidines: Synthesis, reactivity studies and structural aspects. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.05.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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