Ba₄Al₇Li_28.08O_26.92N_1.08, the Barium Oxonitridolithoaluminate with a Highly Condensed LiO₄ Tetrahedra Framework

Abstract

The new compound Ba 4 Al 7 Li 28.08 O 26.92 N 1.08 consists of AlO 4 /AlO 3 N tetrahedra, 10-fold coordinated Ba 2+ cations, and a highly condensed edge-and corner-sharing LiO 4 tetrahedra framework, which leads to a degree of condensation greater than 1. The first barium oxonitridolithoaluminate was synthesized by a high-temperature solid-state reaction in a weld-shut tantalum ampoule and the crystal structure has been determined by single-crystal X-ray diffraction. Ba 4 Al 7 Li 28.08 O 26.92 N 1.08 crystallizes in the monoclinic space group P2 1 /m (no. 11) with the lattice parameters a = 1052.41(3), b = 615.93(2), c = 1088.45(4) pm, β = 98.86(1)°, and a volume of V = 0.69712(4) nm 3 . In addition, Ba 4 Al 7 Li 28.08 O 26.92 N 1.08 doped with the activator ion Eu 2+ , exhibits a broad band emission with a maximum at λ max = 524 nm (2.34 eV) with a fwhm of 112 nm (4373 cm −1 /0.54 eV), which can be described by a superposition of two adjusted emission bands at λ max = 515 nm (2.41 eV) with a fwhm of 70 nm (2704 cm −1 /0.34 eV), and at λ max = 574 nm (2.18 eV) with a fwhm of 127 nm (4127 cm −1 /0.51 eV).

Synthesis of Cytotoxic Iron‐Containing Macrocycles Through Unexpected C(sp2)−C(sp2) Bonds Formation

“…Noteworthily, compounds with LiO 4 in their crystal structure have been reported. [45,46] The molecular structure of the cationic fragment is shown in Figure 3. It contains two linked pyridine rings and two biphenyl groups.…”

“…The lithium tetroxide is presumably an impurity dragged from the synthesis of the BrCNC ligand in which lithium chloride is utilized (see experimental section), [43,44] coming either from the commercial LiCl (Sigma Aldrich) or, less likely, formed in a reaction between lithium salts and [Fe 3 (CO) 12 ]. Noteworthily, compounds with LiO 4 in their crystal structure have been reported [45,46] . The molecular structure of the cationic fragment is shown in Figure 3.…”