{Ni₄} Cubanes from enantiomerically pure 2-(1-hydroxyethyl)pyridine ligands: supramolecular chirality

Abstract

Unprecedented homometallic NiII cubanes have been prepared from chiral ligands. Their structures have been correlated with their magnetic properties.

Stabilization of Ni0/NiII Heterojunctions inside Robust Porous Metal Silicate Materials for High-Performance Catalysis

“…As shown in Scheme , PMS-22 was synthesized by a three-step process, including encapsulation of coordination complex Ni-hmp in silica gel, calcination at 600 °C in air atmosphere, and reduction at 500 °C in H 2 atmosphere, denoted as the PMS-22 precursor, the calcinated PMS-22 precursor, and PMS-22, respectively. Fourier transform infrared (FT-IR) spectrum of the PMS-22 precursor shows the typical vibration peaks ascribed to the alkoxo-bridged nickel (Ni 3 O) unit (646 cm –1 ), CN (1610 cm –1 ), and CC (1442 cm –1 ) moieties in hmp, while the peaks at 465, 795, and 1100 cm –1 are assigned to the Si–O bending vibrations, respectively (Figure a) . There is no apparent diffraction peak in the powder X-ray diffraction (PXRD) pattern, indicating that the coordination template is not aggregated in the PMS-22 precursor (Figure b).…”

“…Fourier transform infrared (FT-IR) spectrum of the PMS-22 precursor shows the typical vibration peaks ascribed to the alkoxo-bridged nickel (Ni 3 O) unit (646 cm −1 ), C�N (1610 cm −1 ), and C�C (1442 cm −1 ) moieties in hmp, while the peaks at 465, 795, and 1100 cm −1 are assigned to the Si−O bending vibrations, respectively (Figure 1a). 27 There is no apparent diffraction peak in the powder Xray diffraction (PXRD) pattern, indicating that the coordination template is not aggregated in the PMS-22 precursor (Figure 1b). Thermogravimetric analysis (TGA) measurements showed that the thermal behaviors of the PMS-22 precursor are similar to those of the coordination complex Ni-hmp in the air atmosphere (Figure 1c).…”

Magneto-optical Properties of Chiral Co2Ln and Co3Ln2 (Ln = Dy and Er) Clusters

“…Each Co III ion is six-coordinated with a distorted octahedral coordination geometry, ligated by three N atoms and three O atoms from three R -mpm – ligands. Notably, the structure exhibits chiral spatial arrangements around the metal center, as shown in Figure S5. , …”

“…Notably, the structure exhibits chiral spatial arrangements around the metal center, as shown in Figure S5. 22,23 The cluster of (R)-Co 3 Dy 2 crystallizes in the tetragonal chiral space group P4 3 2 1 . As shown in Figure 1b S6).…”