Tris(2-pyridylborate) (Tpyb) metal complexes: Synthesis, characterization, and formation of extrinsically porous materials with large cylindrical channels

Chengzhong Cui, Patrick R. Shipman, Roger Lalancette, Frieder Jaekle

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Sandwich-like metal complexes (Tpyb)2M (M = Mg, Fe, Mn) that are based on the novel t-butylphenyltris(2-pyridyl)borate ligand were prepared and fully characterized by multinuclear NMR spectroscopy, high-resolution matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, and single crystal X-ray crystallography. The unique steric and electronic nature of the Tpyb ligand led to structural parameters and properties that are quite different to those of previously reported tris(pyrazolyl)borate and tris(2-pyridyl)aluminate complexes. Most importantly, depending on the crystallization procedure, supramolecular structures could be generated with relatively smaller (ca. 4-5 Å) or larger (ca. 8 Å) diameter pores propagating throughout the crystal lattice. Although the supramolecular structures are held together only by weak intermolecular C-H⋯π interactions, the solvent in the larger channels could be completely removed without any loss of crystallinity or degradation of the framework. Surface area and gas uptake measurements on the Mg complex further confirmed the permanent porosity, while the calculated non-localized density functional theory (NLDFT) pore diameter of 8.6 Å proved to be in excellent agreement with that obtained from single crystal X-ray crystallography. Our new materials are remarkably thermally stable as degradation did not occur up to about 400 C based on thermogravimetric analysis (TGA), and a sample of the Mg complex showed no loss of crystallinity even after heating to 140 C under high vacuum for 72 h according to single crystal X-ray diffraction data.

Original languageEnglish (US)
Pages (from-to)9440-9448
Number of pages9
JournalInorganic Chemistry
Volume52
Issue number16
DOIs
StatePublished - Aug 19 2013

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Coordination Complexes
porous materials
Porous materials
X ray crystallography
Single crystals
borates
porosity
crystallography
crystallinity
single crystals
synthesis
metals
degradation
Ligands
Degradation
Gas fuel measurement
Borates
ligands
x rays
high vacuum

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

@article{1da5f536b22c4e33bb07105be6eb2c07,
title = "Tris(2-pyridylborate) (Tpyb) metal complexes: Synthesis, characterization, and formation of extrinsically porous materials with large cylindrical channels",
abstract = "Sandwich-like metal complexes (Tpyb)2M (M = Mg, Fe, Mn) that are based on the novel t-butylphenyltris(2-pyridyl)borate ligand were prepared and fully characterized by multinuclear NMR spectroscopy, high-resolution matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, and single crystal X-ray crystallography. The unique steric and electronic nature of the Tpyb ligand led to structural parameters and properties that are quite different to those of previously reported tris(pyrazolyl)borate and tris(2-pyridyl)aluminate complexes. Most importantly, depending on the crystallization procedure, supramolecular structures could be generated with relatively smaller (ca. 4-5 {\AA}) or larger (ca. 8 {\AA}) diameter pores propagating throughout the crystal lattice. Although the supramolecular structures are held together only by weak intermolecular C-H⋯π interactions, the solvent in the larger channels could be completely removed without any loss of crystallinity or degradation of the framework. Surface area and gas uptake measurements on the Mg complex further confirmed the permanent porosity, while the calculated non-localized density functional theory (NLDFT) pore diameter of 8.6 {\AA} proved to be in excellent agreement with that obtained from single crystal X-ray crystallography. Our new materials are remarkably thermally stable as degradation did not occur up to about 400 C based on thermogravimetric analysis (TGA), and a sample of the Mg complex showed no loss of crystallinity even after heating to 140 C under high vacuum for 72 h according to single crystal X-ray diffraction data.",
author = "Chengzhong Cui and Shipman, {Patrick R.} and Roger Lalancette and Frieder Jaekle",
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Tris(2-pyridylborate) (Tpyb) metal complexes : Synthesis, characterization, and formation of extrinsically porous materials with large cylindrical channels. / Cui, Chengzhong; Shipman, Patrick R.; Lalancette, Roger; Jaekle, Frieder.

In: Inorganic Chemistry, Vol. 52, No. 16, 19.08.2013, p. 9440-9448.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Tris(2-pyridylborate) (Tpyb) metal complexes

T2 - Synthesis, characterization, and formation of extrinsically porous materials with large cylindrical channels

AU - Cui, Chengzhong

AU - Shipman, Patrick R.

AU - Lalancette, Roger

AU - Jaekle, Frieder

PY - 2013/8/19

Y1 - 2013/8/19

N2 - Sandwich-like metal complexes (Tpyb)2M (M = Mg, Fe, Mn) that are based on the novel t-butylphenyltris(2-pyridyl)borate ligand were prepared and fully characterized by multinuclear NMR spectroscopy, high-resolution matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, and single crystal X-ray crystallography. The unique steric and electronic nature of the Tpyb ligand led to structural parameters and properties that are quite different to those of previously reported tris(pyrazolyl)borate and tris(2-pyridyl)aluminate complexes. Most importantly, depending on the crystallization procedure, supramolecular structures could be generated with relatively smaller (ca. 4-5 Å) or larger (ca. 8 Å) diameter pores propagating throughout the crystal lattice. Although the supramolecular structures are held together only by weak intermolecular C-H⋯π interactions, the solvent in the larger channels could be completely removed without any loss of crystallinity or degradation of the framework. Surface area and gas uptake measurements on the Mg complex further confirmed the permanent porosity, while the calculated non-localized density functional theory (NLDFT) pore diameter of 8.6 Å proved to be in excellent agreement with that obtained from single crystal X-ray crystallography. Our new materials are remarkably thermally stable as degradation did not occur up to about 400 C based on thermogravimetric analysis (TGA), and a sample of the Mg complex showed no loss of crystallinity even after heating to 140 C under high vacuum for 72 h according to single crystal X-ray diffraction data.

AB - Sandwich-like metal complexes (Tpyb)2M (M = Mg, Fe, Mn) that are based on the novel t-butylphenyltris(2-pyridyl)borate ligand were prepared and fully characterized by multinuclear NMR spectroscopy, high-resolution matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, and single crystal X-ray crystallography. The unique steric and electronic nature of the Tpyb ligand led to structural parameters and properties that are quite different to those of previously reported tris(pyrazolyl)borate and tris(2-pyridyl)aluminate complexes. Most importantly, depending on the crystallization procedure, supramolecular structures could be generated with relatively smaller (ca. 4-5 Å) or larger (ca. 8 Å) diameter pores propagating throughout the crystal lattice. Although the supramolecular structures are held together only by weak intermolecular C-H⋯π interactions, the solvent in the larger channels could be completely removed without any loss of crystallinity or degradation of the framework. Surface area and gas uptake measurements on the Mg complex further confirmed the permanent porosity, while the calculated non-localized density functional theory (NLDFT) pore diameter of 8.6 Å proved to be in excellent agreement with that obtained from single crystal X-ray crystallography. Our new materials are remarkably thermally stable as degradation did not occur up to about 400 C based on thermogravimetric analysis (TGA), and a sample of the Mg complex showed no loss of crystallinity even after heating to 140 C under high vacuum for 72 h according to single crystal X-ray diffraction data.

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