Notash Behrouz, Farhadi Rodbari Mona, Kubicki Maciej
Department of Inorganic Chemistry, Shahid Beheshti University, 1983969411 Tehran, Iran.
Faculty of Chemistry, Adam Mickiewicz University, Poznań, Uniwersytetu Poznanskiego 8, 61-614 Poznań, Poland.
ACS Omega. 2023 Mar 27;8(14):13140-13152. doi: 10.1021/acsomega.3c00405. eCollection 2023 Apr 11.
Two concomitant pseudopolymorph coordination polymers {[CdL(OAc)]·2DMSO} () and {[CdL(OAc)]·2.75HO} () were synthesized by self-assembly of 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene () and cadmium acetate in DMSO. Single-crystal X-ray diffraction confirmed that 1D ladder structural motifs exist for pseudopolymorphs and which contain DMSO and water guest molecules, respectively. Our study illustrated the active role of solvent water content in obtaining compound . We find that the presence of water as an impurity in the DMSO solvent creates the possibility of formation of concomitant pseudopolymorph coordination polymers which is a unique event. Furthermore, our analyses showed the effect of environmental humidity on the transformation of unstable compound . 1D ladder pseudopolymorphic compound could be transformed to guest-free 1D linear compound [CdL(OAc)(HO)] () (the powder form of single crystals of ) through a scarce case of water absorption from air. Also, the crystalline material of coordination polymer was transformed to coordination polymer through the dissolution-recrystallization structural transformation process in DMF or DMSO. Our study clarified that the amount of water in the reaction container can control the formation of one of the compounds or . In the presence of a significant amount of water, compound (coordinated water) will be produced, whereas if a small amount of water is present, compound (uncoordinated water) is prepared as an exclusive product.
通过1,4-双(4-吡啶基)-2,3-二氮杂-1,3-丁二烯（ ）与醋酸镉在二甲基亚砜（DMSO）中自组装，合成了两种伴随的假多晶型配位聚合物{[CdL(OAc)]·2DMSO} （ ）和{[CdL(OAc)]·2.75H₂O} （ ）。单晶X射线衍射证实，假多晶型物 和 中存在一维梯形结构单元，它们分别包含DMSO和水客体分子。我们的研究表明了溶剂水含量在获得化合物 中的积极作用。我们发现，DMSO溶剂中作为杂质存在的水使得形成伴随的假多晶型配位聚合物成为可能，这是一个独特的现象。此外，我们的分析表明了环境湿度对不稳定化合物 转变的影响。一维梯形假多晶型化合物 可以通过从空气中罕见的吸水情况转变为无客体的一维线性化合物[CdL(OAc)(H₂O)] （ 的单晶粉末形式）。同样，配位聚合物 的晶体材料通过在N,N-二甲基甲酰胺（DMF）或DMSO中的溶解-重结晶结构转变过程转变为配位聚合物 。我们的研究阐明了反应容器中的水量可以控制化合物 或 之一的形成。在存在大量水的情况下，将生成化合物 （配位水），而如果存在少量水，则仅制备化合物 （未配位水）作为产物。
