Reaction-dependent catenane supramolecular isomerism in cadmium coordination polymers

IF 4.2 Q2 CHEMISTRY, MULTIDISCIPLINARY

Results in Chemistry Pub Date : 2025-09-22 DOI:10.1016/j.rechem.2025.102732

Ghazale Khorshidi, Bahareh Rezaei Kheirkhah, Behrouz Notash

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Abstract

Two concomitant reaction-dependent supramolecular isomers of cadmium (II) coordination polymer by using Cd(NO₃)₂.4H₂O and 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene (L), which differ in degree of interpenetration, were isolated. The structural features of these coordination polymers, {[CdL_1.5(NO₃)₂](L_0.5)}_n (1) and [CdL_1.5(NO₃)₂]_n (2), were elucidated through single-crystal X-ray diffraction and further confirmed by infrared spectra (FT-IR) and powder X-ray diffraction (PXRD). X-ray structural analysis shows that compounds 1 and 2 can be simplified as a honeycomb (6,3) net. The study reveals that compound 1 forms a 2-fold interpenetrated 2D + 2D → 3D inclined polycatenated structure, in contrast to compound 2, which crystallizes as a non-interpenetrated (interdigitated) 2D motif.

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镉配位聚合物中反应依赖的连环烷超分子异构体

用Cd(NO3)2.4H2O和1,4-二（3-吡啶基）-2,3-二氮杂-1,3-丁二烯(L)分离了两个反应依赖的镉（II）配位聚合物超分子异构体，它们的相互渗透程度不同。通过单晶x射线衍射分析了配位聚合物{[CdL1.5(NO3)2](L0.5)}n(1)和[CdL1.5(NO3)2]n(2)的结构特征，并通过红外光谱（FT-IR）和粉末x射线衍射（PXRD）进一步证实了它们的结构特征。x射线结构分析表明，化合物1和2可以简化为蜂窝（6,3）网。研究表明，化合物1形成了2重互穿2D + 2D→3D倾斜多连锁结构，而化合物2则形成了非互穿（互指）2D基序。

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