Synthesis and characterization of heterometallic rings templated through alkylammonium or imidazolium cations.
Synthesis and characterization of heterometallic rings templated through alkylammonium or imidazolium cations.
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DOI：
10.1039/d3dt00982c
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发表时间：
2023-06-06
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影响因子：
--
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中科院分区：
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我们报道了一系列以烷基铵或咪唑阳离子为模板的杂金属环的合成和结构表征。每种金属的配位几何形状的模板和偏好可以控制异金属化合物的结构，导致八-、九-、十-、十二-和十四-金属环。通过单晶X-射线衍射、元素分析、磁学和EPR测量对化合物进行了表征。磁性测量表明，金属中心之间的交换耦合是反铁磁的。EPR谱表明，{Cr 7Zn}和{Cr 9 Zn}的光谱为S = 3/2基态，而{Cr 12 Zn 2}和{Cr 8 Zn}的光谱为S = 1和2激发态。{（ImidH）-Cr 6 Zn 2}、{（1-MeImH）-Cr 8 Zn 2}和{（1，2-diMeImH）-Cr 8 Zn 2}的EPR谱包括键合异构体的组合。这些相关化合物的结果使我们能够检查化合物之间的磁性参数的可转移性。本文报道了七个新的异金属{CrxZny}环，其大小从八金属到十四金属不等，并报道了它们的结构、磁性和EPR谱。
We report the synthesis and structural characterization of a series of heterometallic rings templated via alkylammonium or imidazolium cations. The template and preference of each metal's coordination geometry can control the structure of heterometallic compounds, leading to octa-, nona-, deca-, dodeca-, and tetradeca-metallic rings. The compounds were characterized by single-crystal X-ray diffraction, elemental analysis, magnetometry, and EPR measurements. Magnetic measurements show that the exchange coupling between metal centres is antiferromagnetic. EPR spectroscopy shows that the spectra of {Cr7Zn} and {Cr9Zn} have S = 3/2 ground states, while the spectra of {Cr12Zn2} and {Cr8Zn} are consistent with S = 1 and 2 excited states. The EPR spectra of {(ImidH)-Cr6Zn2}, {(1-MeImH)-Cr8Zn2}, and {(1,2-diMeImH)-Cr8Zn2} include a combination of linkage isomers. The results on these related compounds allow us to examine the transferability of magnetic parameters between compounds. Seven new heterometallic {CrxZny} rings are reported, ranging in size from octametallic to tetradecametallic; their structures, magnetism and EPR spectra are reported.
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DOI：
10.1002/chem.201503431
发表时间：
2016-01-26
期刊：
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子：
--
作者：
Baker ML;Lancaster T;Chiesa A;Amoretti G;Baker PJ;Barker C;Blundell SJ;Carretta S;Collison D;Güdel HU;Guidi T;McInnes EJ;Möller JS;Mutka H;Ollivier J;Pratt FL;Santini P;Tuna F;Tregenna-Piggott PL;Vitorica-Yrezabal IJ;Timco GA;Winpenny RE
通讯作者：
Winpenny RE
影响因子：
16.6
作者：
Cador, O;Gatteschi, D;Winpenny, REP
通讯作者：
Winpenny, REP
影响因子：
4.6
作者：
GOODGAME, DM;HITCHMAN, MA
通讯作者：
HITCHMAN, MA
影响因子：
4.3
作者：
Boeer, Angelika B.;Collison, David;Winpenny, Richard E. P.
通讯作者：
Winpenny, Richard E. P.
影响因子：
4.6
作者：
Johnson, DW;Raymond, KN
通讯作者：
Raymond, KN