Calix[4]pyrrole Schiff base macrocycles: Novel binucleating ligands for Cu(I) and Cu(II)

Jacqueline M. Veauthier; Elisa Tomat; Vincent M. Lynch; Jonathan L. Sessler; Utkir Mirsaidov; John T. Markert

doi:10.1021/ic050690d

Calix[4]pyrrole Schiff base macrocycles: Novel binucleating ligands for Cu(I) and Cu(II)

Jacqueline M. Veauthier, Elisa Tomat, Vincent M. Lynch, Jonathan L. Sessler, Utkir Mirsaidov, John T. Markert

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

51 Scopus citations

Abstract

New bimetallic copper(I) and copper(II) complexes of dipyrromethane-derived Schiff base macrocycles are reported. Two different structural motifs were identified, providing support for the notion that ligands of this type can support a variety of coordination modes. In the case of the Cu(I) complexes, the metal centers were found to have a distorted tetrahedral geometry and be coordinated to two imine nitrogens on each side of the ligand, with the exact structure depending on the choice of Schiff base macrocycle. In contrast to what is seen for Cu(I), with Cu(II) as the coordinated cation the Cu(II) metal centers assumed distorted square planar geometries, and both pyrrole N-Cu and imine N-Cu interactions were confirmed by single-crystal X-ray diffraction analysis. This structural analysis revealed a copper-copper distance of 3.47 Å, while SQUID magnetic susceptibility data provided evidence for antiferromagnetic coupling between the two metal centers.

Original language	English (US)
Pages (from-to)	6736-6743
Number of pages	8
Journal	Inorganic Chemistry
Volume	44
Issue number	19
DOIs	https://doi.org/10.1021/ic050690d
State	Published - Sep 19 2005
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "Calix[4]pyrrole Schiff base macrocycles: Novel binucleating ligands for Cu(I) and Cu(II)",

abstract = "New bimetallic copper(I) and copper(II) complexes of dipyrromethane-derived Schiff base macrocycles are reported. Two different structural motifs were identified, providing support for the notion that ligands of this type can support a variety of coordination modes. In the case of the Cu(I) complexes, the metal centers were found to have a distorted tetrahedral geometry and be coordinated to two imine nitrogens on each side of the ligand, with the exact structure depending on the choice of Schiff base macrocycle. In contrast to what is seen for Cu(I), with Cu(II) as the coordinated cation the Cu(II) metal centers assumed distorted square planar geometries, and both pyrrole N-Cu and imine N-Cu interactions were confirmed by single-crystal X-ray diffraction analysis. This structural analysis revealed a copper-copper distance of 3.47 {\AA}, while SQUID magnetic susceptibility data provided evidence for antiferromagnetic coupling between the two metal centers.",

author = "Veauthier, {Jacqueline M.} and Elisa Tomat and Lynch, {Vincent M.} and Sessler, {Jonathan L.} and Utkir Mirsaidov and Markert, {John T.}",

year = "2005",

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doi = "10.1021/ic050690d",

language = "English (US)",

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T1 - Calix[4]pyrrole Schiff base macrocycles

T2 - Novel binucleating ligands for Cu(I) and Cu(II)

AU - Veauthier, Jacqueline M.

AU - Tomat, Elisa

AU - Lynch, Vincent M.

AU - Sessler, Jonathan L.

AU - Mirsaidov, Utkir

AU - Markert, John T.

PY - 2005/9/19

Y1 - 2005/9/19

N2 - New bimetallic copper(I) and copper(II) complexes of dipyrromethane-derived Schiff base macrocycles are reported. Two different structural motifs were identified, providing support for the notion that ligands of this type can support a variety of coordination modes. In the case of the Cu(I) complexes, the metal centers were found to have a distorted tetrahedral geometry and be coordinated to two imine nitrogens on each side of the ligand, with the exact structure depending on the choice of Schiff base macrocycle. In contrast to what is seen for Cu(I), with Cu(II) as the coordinated cation the Cu(II) metal centers assumed distorted square planar geometries, and both pyrrole N-Cu and imine N-Cu interactions were confirmed by single-crystal X-ray diffraction analysis. This structural analysis revealed a copper-copper distance of 3.47 Å, while SQUID magnetic susceptibility data provided evidence for antiferromagnetic coupling between the two metal centers.

AB - New bimetallic copper(I) and copper(II) complexes of dipyrromethane-derived Schiff base macrocycles are reported. Two different structural motifs were identified, providing support for the notion that ligands of this type can support a variety of coordination modes. In the case of the Cu(I) complexes, the metal centers were found to have a distorted tetrahedral geometry and be coordinated to two imine nitrogens on each side of the ligand, with the exact structure depending on the choice of Schiff base macrocycle. In contrast to what is seen for Cu(I), with Cu(II) as the coordinated cation the Cu(II) metal centers assumed distorted square planar geometries, and both pyrrole N-Cu and imine N-Cu interactions were confirmed by single-crystal X-ray diffraction analysis. This structural analysis revealed a copper-copper distance of 3.47 Å, while SQUID magnetic susceptibility data provided evidence for antiferromagnetic coupling between the two metal centers.

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ER -

Calix[4]pyrrole Schiff base macrocycles: Novel binucleating ligands for Cu(I) and Cu(II)

Abstract

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