Tolerance factor and phase stability of the garnet structure. Corrigendum

An error in an equation in the paper by Song et al. [ Acta Cryst. (2019), C 75 , 1353–1358 ] is corrected.     

(Gd,Lu)3Al5O12∶Tb3+,Eu3+透明陶瓷制备与发光性能

通过简单的化学沉淀法制备了纳米前驱体,结合真空烧结工艺,制备了一系列镥稳定钆铝石榴石{(Gd, Lu)₃Al₅O₁₂∶Tb,Eu}透明陶瓷。将透明陶瓷加工成1 mm厚的圆片,对透明陶瓷样品进行了X射线衍射、光致发光、透过率和衰减时间等表征。高温烧结过后,陶瓷样品仍保持稳定的石榴石相。选定313 nm作为透明陶瓷的激发波长,可获得最强的荧光发射。此外,通过对不同样品进行紫外可见荧光测试,获得了由绿光到红光的可调节发射。在313 nm激发,543 nm和591 nm的监测波长下,透明陶瓷样品均具有Eu³⁺的毫秒级衰减时间。     

RIG型磁光薄膜的研究进展及应用

随着光通信技术与光子集成电路的发展,非互易性器件作为光通信系统中重要的组成部分得到了越来越广泛的研究与应用。基于磁光效应制成的磁光隔离器和环行器是目前应用最为广泛的非互易性器件,为了将非互易性器件整块集成在硅片上,需制备性能与块状磁光材料相当的磁光薄膜。在近红外通信波段(1 550 nm),以钇铁石榴石(Y₃Fe₅O₁₂,YIG)为代表的稀土铁石榴石(RIG)具备优良的磁光效应,是最具应用前景的磁光材料之一。研究发现,使用稀土离子对YIG薄膜进行掺杂可以有效改善其磁光性能,尤其是Bi³⁺和Ce³⁺掺杂的YIG表现出巨法拉第效应。本文首先介绍了法拉第效应原理,介绍了三种常见磁光薄膜的生长方法,回顾了近年来的主要研究成果,介绍了磁光薄膜在光隔离器和环行器中的应用,最后对磁光薄膜的未来发展趋势进行了展望。     

Determination of titanium content in pyrope by Raman spectroscopy

The titanium content of pyrope garnet can be quantified using the intensity of a Raman band at about 830 cm⁻¹ that is normalized to the 363 cm⁻¹ band using a spectrometer‐specific calibration using 10 to 15 chromian pyropes from Bohemia, Czech Republic. An accuracy of 0.025 wt% could be achieved for TiO₂ contents between 0.17 and 0.67 wt% TiO₂ with a Raman spectrometer with a spectral resolution of better than 3.9 cm⁻¹. The technique can be used in petrological and gemmological studies. Copyright © 2015 John Wiley & Sons, Ltd.     

Platinum coordination compounds of thiosemicarbazide derivatives: a new class of platinum blues

Platinum(II) forms blue 1?:?2 coordination compounds with 1-phenylthiosemicarbazide [H(1-PTSC)], 4-phenylthiosemicarbazide [H(4-PTSC)], 1,4-diphenylthiosemicarbazide [H(1,4-DPTSC)] and 4-(2-pyridyl)-thiosemicarbazide [H(4-(2py)-TSC)]. Electronic spectra of these compounds have been studied in different solvents. In all compounds, a band is observed in the 650–750?nm region that appears to be a metal-to-ligand charge transfer band. Infrared and proton NMR studies have been carried out to determine possible coordination sites and the nature of the complexes. IR spectra indicate bonding through sulfur and nitrogen and proton NMR spectra indicate bonding through the N¹nitrogen.     

Metal-Selenium Interactions. Crystal Structures of [Dihalo-{1, 1'-Methylene-Bis(Diphenyl Phosphine Selenide)}] Mercury(II) Complexes

Crystal structures of mercury(II) complexes with a bis(tertiary phosphine selenide), namely 1,1'-methylenebis(diphenylphosphine selenide) $\{{\rm Ph_2P(Se){{\hskip -1pt -\!\!\!- \hskip-.5pt}} CH_2{{\hskip -1pt -\!\!\!- \hskip-.5pt}} P(Se)Ph_2,\ dpmSe_2}\}$     

Silica Gel Supported Chromium Trioxide: An Efficient Reagent for Oxidative Cleavage of Oximes to Carbonyl Compounds under Mild Condition

A facile, efficient oxidative deblocking of aldoximes and ketoximes to their corresponding aldehydes and ketones have been achieved by using silica gel supported chromium trioxide.     

Regeneration of Carbonyl Compounds from Oximes and Hydrazones Using Peroxymonosulfate on Silica gel under Solvent-free Conditions

In an environmentally benign solvent-free system, oximes and hydrazones are rapidly transformed into parent carbonyl compounds using peroxymonosulfate on silica gel under microwave irradiation in good to excellent yields.     

Sequential three-component reactions: synthesis, regioselectivity and application of functionalized dihydropyridines (DHPs) for the creation of fused naphthyridines

Facile and efficient synthesis of tetrasubstituted 1,4- and 1,6-dihydropyridines (DHPs) has been achieved by employing three-component domino reaction using dimethyl acetylenedicarboxylate (DMAD), aliphatic amines, and α,β-unsaturated aldehyde in the presence of 30 mol % trifluoroacetic acid. Interestingly, regioselectivity for the synthesis of 1,4-dihydropyridines can be increased by using 30 mol % triflic acid. In addition, the synthesis of fused-naphthyridine derivatives has been accomplished involving imino-Diels-Alder reaction by employing 1,4-dihydropyridines, aromatic aldehydes, and aromatic amines.