Self-assembly of a Cobalt Octaeyanotungstate Network into a Giant Chiral Helix
Self-assembly of a Cobalt Octaeyanotungstate Network into a Giant Chiral Helix
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八氰钨酸钴网络自组装成巨型手性螺旋
DOI：
10.1016/j.poly.2013.10.004
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发表时间：
2014
期刊：
影响因子：
2.6
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Shiga;T. ; Tetuka;: T. ; Iijima;F. ; Newton G. N. ; Oshio;H.
合成了一维网络结构的氰根桥联钨酸钴配合物{[Co 17 W 9（CN）72（LR或S）26（MeOH）4]·16 MeOH·64 H2O}n（1 Ror 1 S：LR或S= N-（2-吡啶亚甲基）-（R或S）-1-苯乙胺）。单晶X射线衍射分析表明，1 R具有氰根桥联的手性螺旋一维结构，其中氰根桥联的{Co 15 W8}单元通过Co-W-Co三核单元连接。{Co 15 W8}单元由四个三角双锥{Co 3 W2}部分组成。螺旋链结构具有31螺旋对称性，并以手性一维网络形式存在。螺旋的螺距为38 π，超过了双链B-DNA的螺距（34 π）。在Co 17 W 9链中，15个Co（II）离子是顺磁性的，而剩下的2个Co（III）离子和所有9个W（IV）离子是反磁性的。总的来说，链在1.8-300 K范围内表现出顺磁性行为。
Cyanide-bridged cobalt-tungstate one-dimensional networks, {[Co17W9(CN)72(LR or S)26(MeOH)4]·16MeOH·64H2O}n(1Ror1S: LR or S= N-(2-pyridylmethylene)-(R or S)-1-phenylethylamine), were synthesized. Single-crystal X-ray crystallography reveals that1Rhas a cyanide-bridged chiral helical one-dimensional structure, in which cyanide-bridged {Co15W8} units are linked by Co–W–Co trinuclear units. The {Co15W8} unit consists of four trigonal bipyramidal {Co3W2} moieties. The helical chain structure has 31screw symmetry and exists as a chiral one-dimensional network. The pitch of the helix is 38 Å, exceeding that of double-stranded B-DNA (∼34 Å). In the Co17W9chain, fifteen of the Co(II) ions are paramagnetic, while the remaining two Co(III) ions and all nine W(IV) ions are diamagnetic. Overall, the chains show paramagnetic behavior in the range of 1.8–300 K.