A [2 × 2] Cu4 molecular grid and a Mn5 cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene

Atanu Jana; Saugata Konar; Kinsuk Das; Sangita Ray; James A. Golen; Arnold L. Rheingold; Mohamed Salah El Fallah; Sanghamitra Mukherjee; Samik Gupta; Armando J.L. Pombeiro; Susanta Kumar Kar

doi:10.1016/j.poly.2013.05.056

A [2 × 2] Cu₄ molecular grid and a Mn₅ cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene

Atanu Jana, Saugata Konar, Kinsuk Das, Sangita Ray, James A. Golen, Arnold L. Rheingold, Mohamed Salah El Fallah, Sanghamitra Mukherjee, Samik Gupta, Armando J.L. Pombeiro, Susanta Kumar Kar

Division of System Semiconductor

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10 Scopus citations

Abstract

The homoleptic [2 × 2] tetranuclear compound [Cu₄(PyPzCAP) ₄](NO₃)₄·8H₂O (1) and the pentanuclear Mn(II) cluster [Mn₅(PyPzCAP)₆](ClO ₄)₄·4C₆H₆ (2) are self-assembled from the ditopic pro-ligand HPyPz-CAP [(5-methyl-1-(pyridin-2-yl) -N′-[1-(pyridin-2-yl)ethylidene]-1H-pyrazole-3-carbohydrazide)]. Complex 1 is almost a square grid, and all the Cu(II) centers show a distorted octahedral environment with an N₄O₂ chromophore. Complex 2 has a pentanuclear core with a trigonal bipyramidal arrangement of the Mn(II) atoms. The axial Mn centers bear an N₃O₃ chromophore and the equatorial centers have an N₄O₂ distorted octahedral arrangement. Complex 1 shows a ferromagnetic exchange interaction (J= +4.62 cm ¹ and g= 2.05), whereas 2 shows weak an antiferromagnetic interaction (J= -2.73 cm ¹ and g = 2.02). Both complexes 1 and 2 catalyze the allylic oxidation of cyclohexene to cyclohex-2-ene-1-one with good selectivity and an excellent overall turnover number.

Original language	English
Pages (from-to)	51-60
Number of pages	10
Journal	Polyhedron
Volume	62
DOIs	https://doi.org/10.1016/j.poly.2013.05.056
State	Published - 2013

Keywords

Antiferromagnetic
Ferromagnetic
Pentanuclear Mn(II)
Tetranuclear Cu(II)
Turnover number

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Jana, A., Konar, S., Das, K., Ray, S., Golen, J. A., Rheingold, A. L., El Fallah, M. S., Mukherjee, S., Gupta, S., Pombeiro, A. J. L., & Kar, S. K. (2013). A [2 × 2] Cu₄ molecular grid and a Mn₅ cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene. Polyhedron, 62, 51-60. https://doi.org/10.1016/j.poly.2013.05.056

@article{26e77f138ff84fdabb06d1fcdecf4a26,

title = "A [2 × 2] Cu4 molecular grid and a Mn5 cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene",

abstract = "The homoleptic [2 × 2] tetranuclear compound [Cu4(PyPzCAP) 4](NO3)4·8H2O (1) and the pentanuclear Mn(II) cluster [Mn5(PyPzCAP)6](ClO 4)4·4C6H6 (2) are self-assembled from the ditopic pro-ligand HPyPz-CAP [(5-methyl-1-(pyridin-2-yl) -N′-[1-(pyridin-2-yl)ethylidene]-1H-pyrazole-3-carbohydrazide)]. Complex 1 is almost a square grid, and all the Cu(II) centers show a distorted octahedral environment with an N4O2 chromophore. Complex 2 has a pentanuclear core with a trigonal bipyramidal arrangement of the Mn(II) atoms. The axial Mn centers bear an N3O3 chromophore and the equatorial centers have an N4O2 distorted octahedral arrangement. Complex 1 shows a ferromagnetic exchange interaction (J= +4.62 cm 1 and g= 2.05), whereas 2 shows weak an antiferromagnetic interaction (J= -2.73 cm 1 and g = 2.02). Both complexes 1 and 2 catalyze the allylic oxidation of cyclohexene to cyclohex-2-ene-1-one with good selectivity and an excellent overall turnover number.",

keywords = "Antiferromagnetic, Ferromagnetic, Pentanuclear Mn(II), Tetranuclear Cu(II), Turnover number",

author = "Atanu Jana and Saugata Konar and Kinsuk Das and Sangita Ray and Golen, {James A.} and Rheingold, {Arnold L.} and {El Fallah}, {Mohamed Salah} and Sanghamitra Mukherjee and Samik Gupta and Pombeiro, {Armando J.L.} and Kar, {Susanta Kumar}",

year = "2013",

doi = "10.1016/j.poly.2013.05.056",

language = "English",

volume = "62",

pages = "51--60",

journal = "Polyhedron",

issn = "0277-5387",

publisher = "Elsevier Ltd",

}

Jana, A, Konar, S, Das, K, Ray, S, Golen, JA, Rheingold, AL, El Fallah, MS, Mukherjee, S, Gupta, S, Pombeiro, AJL & Kar, SK 2013, 'A [2 × 2] Cu₄ molecular grid and a Mn₅ cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene', Polyhedron, vol. 62, pp. 51-60. https://doi.org/10.1016/j.poly.2013.05.056

A [2 × 2] Cu₄ molecular grid and a Mn₅ cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene. / Jana, Atanu; Konar, Saugata; Das, Kinsuk et al.
In: Polyhedron, Vol. 62, 2013, p. 51-60.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - A [2 × 2] Cu4 molecular grid and a Mn5 cluster derived from a 1-(2-pyridyl)pyrazole based polytopic ligand - Synthesis, structure, magnetic properties and catalytic activity in the allylic oxidation of cyclohexene

AU - Jana, Atanu

AU - Konar, Saugata

AU - Das, Kinsuk

AU - Ray, Sangita

AU - Golen, James A.

AU - Rheingold, Arnold L.

AU - El Fallah, Mohamed Salah

AU - Mukherjee, Sanghamitra

AU - Gupta, Samik

AU - Pombeiro, Armando J.L.

AU - Kar, Susanta Kumar

PY - 2013

Y1 - 2013

N2 - The homoleptic [2 × 2] tetranuclear compound [Cu4(PyPzCAP) 4](NO3)4·8H2O (1) and the pentanuclear Mn(II) cluster [Mn5(PyPzCAP)6](ClO 4)4·4C6H6 (2) are self-assembled from the ditopic pro-ligand HPyPz-CAP [(5-methyl-1-(pyridin-2-yl) -N′-[1-(pyridin-2-yl)ethylidene]-1H-pyrazole-3-carbohydrazide)]. Complex 1 is almost a square grid, and all the Cu(II) centers show a distorted octahedral environment with an N4O2 chromophore. Complex 2 has a pentanuclear core with a trigonal bipyramidal arrangement of the Mn(II) atoms. The axial Mn centers bear an N3O3 chromophore and the equatorial centers have an N4O2 distorted octahedral arrangement. Complex 1 shows a ferromagnetic exchange interaction (J= +4.62 cm 1 and g= 2.05), whereas 2 shows weak an antiferromagnetic interaction (J= -2.73 cm 1 and g = 2.02). Both complexes 1 and 2 catalyze the allylic oxidation of cyclohexene to cyclohex-2-ene-1-one with good selectivity and an excellent overall turnover number.

AB - The homoleptic [2 × 2] tetranuclear compound [Cu4(PyPzCAP) 4](NO3)4·8H2O (1) and the pentanuclear Mn(II) cluster [Mn5(PyPzCAP)6](ClO 4)4·4C6H6 (2) are self-assembled from the ditopic pro-ligand HPyPz-CAP [(5-methyl-1-(pyridin-2-yl) -N′-[1-(pyridin-2-yl)ethylidene]-1H-pyrazole-3-carbohydrazide)]. Complex 1 is almost a square grid, and all the Cu(II) centers show a distorted octahedral environment with an N4O2 chromophore. Complex 2 has a pentanuclear core with a trigonal bipyramidal arrangement of the Mn(II) atoms. The axial Mn centers bear an N3O3 chromophore and the equatorial centers have an N4O2 distorted octahedral arrangement. Complex 1 shows a ferromagnetic exchange interaction (J= +4.62 cm 1 and g= 2.05), whereas 2 shows weak an antiferromagnetic interaction (J= -2.73 cm 1 and g = 2.02). Both complexes 1 and 2 catalyze the allylic oxidation of cyclohexene to cyclohex-2-ene-1-one with good selectivity and an excellent overall turnover number.

KW - Antiferromagnetic

KW - Ferromagnetic

KW - Pentanuclear Mn(II)

KW - Tetranuclear Cu(II)

KW - Turnover number

UR - http://www.scopus.com/inward/record.url?scp=84880184343&partnerID=8YFLogxK

U2 - 10.1016/j.poly.2013.05.056

DO - 10.1016/j.poly.2013.05.056

M3 - Article

AN - SCOPUS:84880184343

SN - 0277-5387

VL - 62

SP - 51

EP - 60

JO - Polyhedron

JF - Polyhedron

ER -