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zmxyn

铁虫 (小有名气)

[求助] 拓扑分析求助:两个结构用diamond简化后 topas一个给出拓扑符号,另一个不能给出 已有1人参与

RT
有两个结构用diamond简化了,选取了两个4链接的节点,图形较为简单(注:节点显示的元素是任意选取的,没有含义)

用topas 40计算后

(1)B-Na2B8O13-的符号是{3^24;4^36;5^6},由于是刚学,符号是什么意思呢?

(2)另一个b-AgBO1111中可能是有链的存在,出不了符号,显示提示如下,这样的是不能获得拓扑符号吗?
Structure consists of chains [ 0 1 0] with Zn
Structure consists of 3D framework with ZnB
There are 2 interpenetrating nets
FISE: Full interpenetration symmetry elements
---------------------------------------------
1: -1
---------------------------------------------
PIC: [0,1,0][1,0,0][0,0,1] (PICVR=1)

Zt=1; Zn=2

Class IIa  Z=2
Elapsed time: 2.22 sec.

谢谢
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ww6174

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【答案】应助回帖

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感谢参与,应助指数 +1
zmxyn: 金币+20, ★★★★★最佳答案 2015-07-07 16:01:10
(1) The local topology of a vertex in a net is sometimes characterized
by a point symbol or a vertex symbol. The point
symbol, introduced by Wells,4 gives information about the
shortest cycles at each angle of a vertex. The point symbol is of
the form Aa
.Bb
... and signifies that there are a angles at which the
shortest cycle is an A-cycle, b angles at which the shortest cycle is
a B-cycle, etc. By convention A < B < ... and a + b + ... = z(z  1)/2,
where z is the coordination number of the vertex and z(z  1)/2 is
the number of angles at that vertex. Point symbols for nets are
conveniently obtained from TOPOS.

具体可以查看topos的帮助文件http://www.crystallography.fr/ma ... ical_manual_103.pdf

Yaghi的文献讲得也很详细
Journal of Solid State Chemistry 178 (2005) 2533–2554
Chem. Rev. 2012, 112, 675–702

(2)你既有二维层,又有三维网络,建议分开讨论
2楼2015-07-05 23:28:22
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