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

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

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 - https://www.scopus.com/pages/publications/84880184343

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 -