铜铝氟硅酸盐CuAl2F2(Si2O7)的发现及其与托帕石的关系
需积分: 8 19 浏览量
更新于2024-08-07
收藏 222KB PDF 举报
"A New Cu, Al Fluoride Disilicate CuAl2F2(Si2O7) and its Relations to Topaz"
这篇学术论文详细介绍了关于一种新型铜铝氟硅酸盐CuAl2F2(Si2O7)的发现及其与托帕石(Topaz)的关系。该化合物是通过水热合成方法制备的，并且其晶体结构通过单晶X射线衍射技术进行了确定。研究显示，CuAl2F2(Si2O7)属于空间群Pnma，其晶格参数为a = 8.8697(9) Å, b = 14.084(2) Å, c = 4.7553(5) Å，wR2 = 0.056，R = 0.022。
在晶体结构中，铜离子Cu2+呈现出拉长的四面体配位，形成一个独特的结构。铝氧氟八面体[AlO4F2]共享棱边和顶点，其中氟原子处于反平行位置，这些八面体排列成平行于ac平面的层状结构。沿着b轴，这些层通过Si2O7团簇相互连接，构建出三维骨架[Al2F2(Si2O7)]2±。此外，[CuO5]五面体将相邻层中的两个Al八面体联系起来，增加了结构的稳定性。
论文中讨论了CuAl2F2(Si2O7)的晶体结构作为托帕石结构的衍生形式，这表明两者之间存在一定的结构相似性。托帕石是一种常见的宝石，其化学式为Al2SiO4(F,OH)2，含有铝、硅、氧以及氟或羟基。然而，新发现的CuAl2F2(Si2O7)引入了铜离子，这在托帕石类矿物中并不常见，为材料科学和矿物学提供了新的研究方向。
作者Olga V. Yakubovich、Ludmilla N. Dem'yanetz和Werner Massa分别来自俄罗斯莫斯科的洛蒙诺索夫国立大学地质系和晶体学研究所，以及德国马堡大学的化学系和科学材料研究中心。此研究对理解含铜矿物的结构特点和性质，以及它们与已知矿物之间的关系具有重要意义，同时也为合成新型功能性材料提供了理论基础。
论文的接收日期为2000年1月4日，献给了Ulrich Müller教授的60岁生日，展示了科研工作者对学术贡献的尊重和纪念。这篇论文揭示了新型铜铝氟硅酸盐的独特结构和其与著名宝石矿物托帕石的关联，对矿物理化性质的研究以及新材料的设计具有深远的科学价值。
A New Cu, Al Fluoride Disilicate CuAl
2
F
2
(Si
2
O
7
) and its Relations to Topaz
Olga V. Yakubovich*
,a
, Ludmilla N. Dem'yanetz
b
, and Werner Massa*
,c
a,b
Moscow/Russia,
a
Department of Geology, Lomonosov State University and
b
Institute of Crystallography, Academy of
Sciences of Russia
c
Marburg, Fachbereich Chemie und Wissenschaftliches Zentrum fuÈr Materialwissenschaften der Philipps-UniversitaÈt
Received January 4th, 2000.
Professor Ulrich MuÈ ller zum 60. Geburtstag gewidmet
Abstract. CuAl
2
F
2
(Si
2
O
7
) has been prepared by hydrother-
mal synthesis and its crystal structure was determined by
single crystal X-ray diffraction: space group Pnma,
a = 8.8697(9), b = 14.084(2), c = 4.7553(5) A
Ê
,wR
2
= 0.056,
R = 0.022. Cu
2+
shows elongated square pyramidal coordina-
tion. Edge- and corner-sharing [AlO
4
F
2
] octahedra with
fluorine atoms in cis position form layers parallel to the ac
plane. Along b these layers are linked by Si
2
O
7
groups to
form a three-dimensional framework [Al
2
F
2
(Si
2
O
7
]
2±
. In ad-
dition, the [CuO
5
] pyramides connect two Al octahedra of
neighbouring layers. The crystal structure is discussed as a
derivative from topaz structure. The modular (or polyso-
matic) approach is used for this purpose, and for modelling
hypothetical related compounds.
Keywords: Copper aluminium fluoride disilicate; Topaz
variants; Crystal structure; Aluminium copper fluoride disili-
cate
Ein neues Cu, Al-Fluoriddisilicat CuAl
2
F
2
(Si
2
O
7
) und dessen Verwandtschaft
zum Topas
Inhaltsu
È
bersicht. CuAl
2
F
2
(Si
2
O
7
) wurde durch Hydrother-
malsynthese erhalten und seine Kristallstruktur durch Ein-
kristall-RoÈntgenbeugung bestimmt: Raumgruppe Pnma,
a = 8.8697(9), b = 14.084(2), c = 4.7553(5) A
Ê
,wR
2
= 0.056,
R = 0.022. Cu
2+
zeigt gestreckte quadratisch-pyramidale Ko-
ordination. Kanten- und eckenverknuÈpfte [AlO
4
F
2
]-Okta-
eder mit Fluoratomen in cis-Position bilden Schichten par-
allel zur ac-Ebene aus. In Richtung der b-Achse werden
diese Schichten durch [Si
2
O
7
]-Gruppen zu einem dreidimen-
sionalen Netzwerk [Al
2
F
2
(Si
2
O
7
)]
2±
verbunden. ZusaÈtzlich
verbruÈcken die [CuO
5
]-Pyramiden zwei Al-Oktaeder be-
nachbarter Schichten. Die Kristallstruktur wird als Ab-
koÈmmling von der Topas-Struktur diskutiert. Dazu wird das
modulare Aufbau-Konzept benutzt, mit dem auch weitere
hypothetische Strukturen modelliert wurden.
Introduction
The modular approach is well known in inorganic
crystal chemistry. It operates with characteristic struc-
tural units or fragments and interprets the crystal
structure as their association in different combina-
tions. According to [1] the modular analysis of crystal
structures is rather complex and combines several as-
pects of modular interpretation, such as symmetry, to-
pology, classification, hierarchy, model simulation etc.
This approach considers the individual structure from
the point of view of its relationship to others, having
some common modular features. It is not fruitful only
to describe structures in this way, the modular ap-
proach seems to be able to work as a very good in-
strument for structural design, too.
We present here the results of the X-ray crystal
structure investigation of a new fluoride disilicate
CuAl
2
F
2
(Si
2
O
7
). These results are interpreted in terms
of the modular concept.
Experimental
Single transparent crystals of aquamarine-like colour
were obtained by hydrothermal synthesis in the system
CuO±Al
2
O
3
±SiO
2
±NH
4
F±H
2
O (T = 450 °C, P = 1000 bar,
t = 100 h). The presence of Cu, Al, Si, O and F in the sam-
ples was confirmed by qualitative X-ray spectral analysis
(CamScan 4DV + EDX Noran Instruments. Voyager 4.0 with
Pioneer Detector with ultrathin window).
Structure determination. The unit cell parameters were
determined and refined on an IPDS area detector system
(Stoe) using MoK
a
radiation (graphite monochromator) and
a total of 5110 reflections were collected. The intensities
1514
Ó WILEY-VCH Verlag GmbH, D-69451 Weinheim, 2000 0044±2313/00/6261514±1518 $ 17.50+.50/0 Z. Anorg. Allg. Chem. 2000, 626, 1514±1518
* Dr. O. V. Yakubovich,
Department of Geology, Moscow Lomonosov State University,
Vorob'evy Gory,
119899 Moscow/Russia
E-mail: yakubol@geol.msu.ru
* Prof. Dr. W. Massa,
Fachbereich Chemie der Philipps-UniversitaÈt,
D-35032 Marburg/Germany,
Fax: +4 96 42 12 82 89 17
E-mail: massa@mail.chemie.uni-marburg.de
下载后可阅读完整内容，剩余4页未读，立即下载
2021-06-29 上传
2021-02-11 上传
2021-06-29 上传
2021-06-29 上传
2021-05-18 上传
2020-01-03 上传
2021-02-22 上传
2020-02-02 上传
2019-10-24 上传
weixin_38546308
- 粉丝: 4
- 资源: 969
我的内容管理
展开
最新资源
- WordPress作为新闻管理面板的实现指南
- NPC_Generator：使用Ruby打造的游戏角色生成器
- MATLAB实现变邻域搜索算法源码解析
- 探索C++并行编程：使用INTEL TBB的项目实践
- 玫枫跟打器：网页版五笔打字工具，提升macOS打字效率
- 萨尔塔·阿萨尔·希塔斯：SATINDER项目解析
- 掌握变邻域搜索算法：MATLAB代码实践
- saaraansh: 简化法律文档，打破语言障碍的智能应用
- 探索牛角交友盲盒系统：PHP开源交友平台的新选择
- 探索Nullfactory-SSRSExtensions: 强化SQL Server报告服务
- Lotide：一套JavaScript实用工具库的深度解析
- 利用Aurelia 2脚手架搭建新项目的快速指南
- 变邻域搜索算法Matlab实现教程
- 实战指南：构建高效ES+Redis+MySQL架构解决方案
- GitHub Pages入门模板快速启动指南
- NeonClock遗产版：包名更迭与应用更新
