RE(OH)₂NO₃ (RE = Tb, Dy, Ho, and Er): Synthesis and Nonlinear Optical Properties of Water-Resistant Lanthanide Hydroxide Nitrates

Abstract

A series of lanthanide-containing water-resistant nitrates, namely RE(OH) 2 NO 3 (RE = Tb(1), Dy(2), Ho(3), and Er(4)), was obtained through the hydrothermal process. As possible nonlinear optical materials, they feature a layered isomorph composed of an [REO 3 (OH) 6 ] polyhedron and an [NO 3 ] triangle, and the synergistic arrangement of the [REO 3 (OH) 6 ] and [NO 3 ] groups in their structures leads to their obvious second-order nonlinear optical effect. Nevertheless, the unique optical absorption caused by the electronic transitions on 4f−4f orbitals of lanthanides results in their second harmonic generation responses of different strengths, with 1 exhibiting 5.07 times that of KDP, but 2−4 showing less than half of KDP. In addition, 1 possesses an outstanding water-resistant capacity and a transparent cut-off edge around 300 nm, foreshadowing its potential value as a nonlinear optical crystal. Moreover, 1 is found to emit characteristic green fluorescence due to the typical 5 D 4 → 7 F 5 transitions of the excited Tb 3+ ions

Ce(IO3)3F and Ce(IO3)2(NO3): Two Mixed-Anion Cerium Iodates with Good Nonlinear Optical and Birefringent Properties

“…Thermogravimetric analysis (TGA) measurement confirms that Ce­(IO 3 ) 3 F is stable up to 420 °C, which is higher than those of Y­(IO 3 ) 2 F (380 °C) and Ce­(IO 3 )­F 2 (H 2 O) (178 °C), and comparable with those of Ce­(IO 3 ) 2 F 2 (420 °C), Li 2 Ce­(IO 3 ) 4 F 2 (419 °C), and CaCe­(IO 3 ) 3 (IO 3 F)F (420 °C). ,− , Ce­(IO 3 ) 2 (NO 3 ) is thermally stable up to 275 °C, which is higher than that of In­(IO 3 )­(OH)­(H 2 O)]­(NO 3 ) (150 °C), and comparable with those of RE­(OH) 2 NO 3 (RE = Tb, Dy, Ho, and Er) (270 °C). , Both Ce­(IO 3 ) 3 F and Ce­(IO 3 ) 2 (NO 3 ) show two main weight loss steps (Figure S3). Based on the PXRD analyses (Figure S4), the residues of both compounds are CeO 2 …”

“…5,[11][12][13]17 Ce(IO 3 ) 2 (NO 3 ) is thermally stable up to 275 °C, which is higher than that of In(IO 3 )(OH)(H 2 O)](NO 3 ) (150 °C), and comparable with those of RE(OH) 2 NO 3 (RE = Tb, Dy, Ho, and Er) (270 °C). 18,19 Both Ce(IO 3 ) 3 F and Ce(IO 3 ) 2 (NO 3 ) show two main weight loss steps (Figure S3). Based on the PXRD analyses (Figure S4), the residues of both compounds are CeO 2 .…”

Chiral amino acid-templated tin fluorides tailoring nonlinear optical properties, birefringence, and photoluminescence

“…1,2 Achieving crystallographically noncentrosymmetric (NCS) structures is crucial for developing NLO materials. Various methods, including the incorporation of lone pair cations such as Ge 2+ , Sn 2+ , and Sb 3+ , [3][4][5] as well as d 0 transition metals such as Nb 5+ , Ta 5+ , Mo 6+ , and W 6+ , [6][7][8][9][10][11] have been explored to synthesize NCS structures. However, discovering NCS compounds in naturally occurring solid-state materials has been challenging attributed to the prevalent preference for centrosymmetric structures in crystalline solids.…”

Two Acentric Zn-Based l-Tartrates with Moderate Second Harmonic Generation Responses and Large Birefringence

“…Both of them display broad absorption peaks near 3200 cm −1 associated with water molecules. 51,52 The absorption bands from 1238 to 1585 cm −1 could be assigned to the asymmetric stretching of C�O and C−O bonds. 53,54 The IR spectrum of Zn-LTS shows the asymmetric and symmetric stretching vibrations of [SO 4 ] group near 1293 cm −1 .…”