Synthesis and structural characterization of rare-earth selenates: Yb₂(SeO₃)(SeO₄)₂(H₂O)₂, Yb(HSeO₃)(SeO₄), and Tm₂(SeO₄)₃(H₂O)₄·H₂O

Three rare-earth selenates of ytterbium and thulium were synthesized by hydro­thermal methods. Single-crystal X-ray diffraction analysis shows that all three com­pounds form three-dimensional framework structures constructed from inter­connected LnO_x polyhedra (Ln = Yb, Tm; x = 7–8) and selenate (SeO₄²⁻) and/or selenite (SeO₃²⁻) groups.

Structures of nickel–, copper–, and zinc–salophen derivatives

The structures of late first-row transition-metal (Ni, Cu, and Zn) com­plexes of salophen derivatives are reported. This family of com­pounds showcases the ease with which peripheral modifications can be made to salophen systems, including the installation of basic sites in the metal secondary coordination sphere.