Orthoborates LiCdRE₅(BO₃)₆ (RE = Sm–Lu and Y) with Rare-Earth Ions on a Triangular Lattice: Synthesis, Crystal Structure, and Optical and Magnetic Properties

Abstract

Single crystals of LiCdY(BO) were successfully grown from a LiO-BO flux, and its lanthanide homotypic compounds, LiCdRE(BO) (RE = Sm-Lu), have been prepared by solid-state reaction. They crystallize in the noncentrosymmetric space group P622 with cell parameters in the ranges of a = 7.0989(2)-6.9337(1) Å and c = 25.9375(1)-24.8960(6) Å. As a representative example, LiCdY(BO) features a triangular lattice in the ab plane composed of three distinct crystallographic Y sites. The triangular lattices spaced with the same distance of [Formula: see text]c are further stacked to build three-dimensional frameworks by reinforcement of the isolated planar BO groups and distorted LiO tetrahedra. Magnetic measurements show that Eu and Sm compounds exhibit typical Van Vleck-type paramagnetism and other rare-earth borates show weak antiferromagnetic behavior. In addition, UV-vis-near-IR diffuse-reflectance and photoluminescence spectra were performed to understand the transition energy levels of active rare-earth ions and their relationships to magnetism.

Construction of lanthanide complexes supported by 2,3‐dimethoxybenzoic acid and 5,5’‐dimethy‐2,2’‐bipyridine: crystal structures, thermoanalysis, magnetic and fluorescence properties

“…Rare‐earth complexes have attracted much interest for their wide application in many fields because of not only their abundant chemical, physical properties and intriguing architectures, but also their potential applications such as luminescent sensing, molecular magnetism, and catalysis fields . For photoluminescence, rare‐earth ions are usually used as luminescent centers for their high luminescence efficiency and adjustable emission color .…”

KRE(CO3)2 (RE = Eu, Gd, Tb): new mixed metal carbonates with strong photoluminescence and large birefringence

“…55,56 The narrow absorption peaks before the UV absorption cutoff edges also appear in other Gd and Tb-containing compounds, such as Gd 2 GeB 2 O 8 , 57 Tb 2 GeB 2 O 8 , 57 and LiCdRE 5 (BO 3 ) 6 (RE = Sm–Lu and Y). 58…”

Na3YB8O15: a new rare-earth borate with an infinite one-dimensional [B8O15]∞chain and a short ultraviolet cutoff edge

“…42 At the same time, we note that the five rare earth ions Sc 3+ , Y 3+ , La 3+ , Gd 3+ , and Lu 3+ with full, half-full or empty d and f orbitals can also effectively inhibit the d–d and f–f electron transitions. 43–47 This makes the cutoff edge of rare-earth metal borate compounds like Li 3 La 2 (BO 3 ) 3 , 48 La 2 CaB 10 O 19 , 49 K 3 YB 6 O 12 , 50 YAl 3 (BO 3 ) 4 , 51 RbBaYB 6 O 12 , 52 and K 7 CaY 2 (B 5 O 10 ) 3 53 reach the UV or DUV regions.…”