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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Co(II) and Cr(III) complexes of formate-formamide mixed ligands: synthesis, structures, single crystal-to-single crystal transformation and magnetic behaviour

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Co(II) and Cr(III) complexes of formate-formamide mixed ligands: synthesis, structures, single crystal-to-single crystal transformation and magnetic behaviour

机译：甲酸-甲酰胺混合配体的Co（II）和Cr（III）配合物：合成，结构，单晶至单晶转变和磁行为

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Solvothermal treatment of an equimolar mixture of Co(NO3)(2)center dot 6H(2)O, HCONH2 and NaN3 in MeOH at 100 degrees C yielded a three-dimensional NaCl type network Co(HCOO)(2)(HCONH2)(2) center dot HCONH2 (1a) containing formamides in the pores of the structure. Solvated pink 1a undergoes single crystal-to-single crystal (SCSC) transformation at 215 degrees C to form the desolvated dark brown product Co(HCOO)(2)-( HCONH2)(2) (1b) with the retention of the original framework. Reversible single crystal-to-single crystal transformation of 1b (brown) to 1a (pink) in the presence of excess formamide was also established at room temperature. The coordination environment around Co(II) in both 1a and 1b is octahedral with a CoN2O4 coordination composition. A similar reaction replacing Co(II) by Cr(III) produced a heterometallic 3D extended network Na[Cr(HCOO)(4)(HCONH2)(2)]center dot 2H(2)O (2a) at 100 degrees C. An increase in reaction temperature to 150 degrees C produced a simple mononuclear complex Cr(HCOO)(3)(HCONH2)(3) center dot 3H(2)O (2b). Variable temperature magnetic studies revealed the presence of a canting phenomena in both 1a and 1b, and hysteresis loop in the field dependent magnetisation plot at 2 K whereas complex 2a is simply paramagnetic in nature.

机译：Co（NO3）（2）中心点6H（2）O，HCONH2和NaN3在MeOH中的等摩尔混合物在100摄氏度下的溶剂热处理产生了三维NaCl型网络Co（HCOO）（2）（HCONH2）（ 2）中心孔HCONH2（1a）在结构的孔中含有甲酰胺。溶剂化的粉红色1a在215摄氏度下经历单晶至单晶（SCSC）转化，形成去溶剂化的暗棕色产品Co（HCOO）（2）-（HCONH2）（2）（1b），并保留了原始框架。在室温下，也建立了在过量甲酰胺存在下从1b（棕色）到1a（粉红色）的可逆单晶至单晶转变。 1a和1b中Co（II）周围的配位环境均为八面体，并带有CoN2O4配位成分。用Cr（III）代替Co（II）的类似反应在100摄氏度下产生了异金属3D扩展网络Na [Cr（HCOO）（4）（HCONH2）（2）]中心点2H（2）O（2a）。将反应温度提高到150摄氏度，生成了简单的单核络合物Cr（HCOO）（3）（HCONH2）（3）中心点3H（2）O（2b）。可变温度磁研究表明，在1a和1b中都存在倾斜现象，并且在2 K时与磁场有关的磁化曲线中存在磁滞回线，而复合物2a本质上只是顺磁性。

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《Dalton transactions: An international journal of inorganic chemistry》 |2009年第46期|共10页
作者
Sengupta O; Song Y; Mukherjee PS;
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中图分类化学;
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METAL-ORGANIC FRAMEWORK; MOLECULAR HOST FRAMEWORKS; DOUBLE-ZIGZAG CHAIN; COORDINATION POLYMER; CANTED ANTIFERROMAGNETISM; HYDROTHERMAL SYNTHESIS; 2-DIMENSIONAL NETWORK; WEAK FERROMAGNETISM; GROUND-STATE; SOLID-STATE;

机译：金属有机框架;分子骨架;双曲折链;配位聚合物;反铁磁;水热合成;二维网络;弱铁磁;地基;固态;

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