Structure, polymorphism and luminescence of cyanate iodides MI(OCN) (M = Ba, Eu, and Sr).

Structure, polymorphism and luminescence of cyanate iodides MI(OCN) (M = Ba, Eu, and Sr).
复制标题

氰酸盐碘化物 MI(OCN)(M = Ba、Eu 和 Sr)的结构、多晶型和发光

DOI:
10.1039/d0dt02126a
复制
发表时间:
2020
影响因子:
4
通讯作者:
H.-J. Meyer
H.-J. Meyer
中科院分区:
化学2区
文献类型:
--
作者:
A. Siai;L. Hämmerle;M. Ströbele;D. Enseling;T. Jüstel;H.-J. Meyer

文献摘要

参考文献

相似文献

采用差示扫描量热法(DSC)和差热分析(DTA)技术,以MI_2和K(OCN)(M = Sr,Eu或Ba)为原料,通过固相反应合成了一系列新化合物MI(OCN)。BaI(OCN)的两相存在是突出的,其在Pnma(α-BaI(OCN))和Cmcm(β-BaI(OCN))空间群中结晶。SrI(OCN)、EuI(OCN)和β-BaI(OCN)化合物在相同的正交Cmcm空间群中结晶,其结构由[M2 I2]2+块的层状排列组成,这些块被单层氰酸根离子隔开,被发现与Sillén型结构有关。通过红外光谱分析,观察到了BaI(OCN)的多晶型。该分析显示了β-BaI(OCN)分裂带,其归因于OCN单元的动力学无序可诱导的多于一种共振氰酸盐形式的存在。与此相反,α-BaI(OCN)振动模式假设存在一种氰酸盐形式,采用确定的取向。在SrI(OCN)和BaI(OCN)化合物中掺杂Eu ~(2+)。在340和350 nm激发下,Eu 2+在β-BaI(OCN)和SrI(OCN)相和α-BaI(OCN)相的4f 65 d1 → 8 S7/2(4f 7)跃迁的431 nm和427 nm处发射出蓝光。
A series of new compounds MI(OCN) were prepared from the mixtures of MI2 and K(OCN) (M = Sr, Eu or Ba) by solid-state reactions that were controlled by differential scanning calorimetry (DSC) and differential thermal analysis (DTA) techniques. The presence of two phases is highlighted for BaI(OCN) which crystallizes in the Pnma (α-BaI(OCN)) and Cmcm (β-BaI(OCN)) space groups. The SrI(OCN), EuI(OCN) and β-BaI(OCN) compounds crystallize in the same orthorhombic Cmcm space group and the structure consists of a layered arrangement of [M2I2]2+ blocks separated by single layers of cyanate ions that are found to be related to the Sillén-type structure. The polymorphism of BaI(OCN) was also observed by analyzing the infrared (IR) spectra. This analysis showed for β-BaI(OCN) splitting bands, which were ascribed to the presence of more than one resonant cyanate form that can be induced by the dynamical disorder of OCN units. In contrast, the α-BaI(OCN) vibration modes suppose the existence of one cyanate form that adopts a defined orientation. The SrI(OCN) and BaI(OCN) compounds were doped with Eu2+. The luminescence spectra recorded under excitation at 340 and 350 nm revealed a blue emission of Eu2+ at 431 nm for the β-BaI(OCN) and SrI(OCN) phases and at 427 nm for the α-BaI(OCN) phase that was ascribed to the 4f65d1 → 8S7/2 (4f7) transition.
氰酸盐的拉曼研究:费米共振、水合和水解成尿素
DOI: --
发表时间: 1993
期刊:
影响因子: --
作者:
M. H. Brooker;N. Wen
通讯作者: N. Wen
四异氰酸硅Si(NCO)4的晶体结构和二态性
DOI: --
发表时间: 2012
期刊:
影响因子: --
作者:
C. Schmidt;M. Jansen
通讯作者: M. Jansen
Na[OCN]170 K 的单晶 X 射线衍射及其振动光谱研究
DOI: --
发表时间: 2010
期刊:
影响因子: --
作者:
O. Reckeweg;A. Schulz;Brian M. Leonard;F. Disalvo
通讯作者: F. Disalvo
DOI: 10.1039/c9dt02124h
发表时间: 2019
影响因子: 4
作者:
A. Siai;A. Oprea;M. Ströbele;H.-J. Meyer
通讯作者: H.-J. Meyer
DOI: 10.1002/crat.201600029
发表时间: 2016-07
影响因子: 1.5
作者:
Markus J. Kalmutzki;Xiao Wang;A. Meixner;H. Meyer
通讯作者: Markus J. Kalmutzki;Xiao Wang;A. Meixner;H. Meyer