College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, P. R. China.
Dalton Trans. 2018 Nov 13;47(44):15888-15896. doi: 10.1039/c8dt03422b.
Three isostructural coordination polymers of the formula [MCl2(DMSO)2(pz)]n (pz = pyrazine, DMSO = dimethyl sulfoxide, M = Mn, Fe and Co for 1-3) were synthesized through the solvothermal reaction of MCl2, DMSO and pz. By introducing DMSO and chloride as electron donor ligands and pz as an accepter, a donor-metal-accepter (D-M-A) system was constructed. Radicals generated by photoinduced electron transfer (PET) from a donor to an accepter result in a dramatic change of vibronic absorption spectra in UV regions and remarkable enhancement of magnetic susceptibility. The mechanism of PET was also determined by PXRD, IR, EPR and XPS measurements. This is the first example of bridging pz complexes which exhibit both photochromism and photomagnetism in a PET process.
三种结构相同的配位聚合物，通式为[MCl2(DMSO)2(pz)]n（pz=吡嗪，DMSO=二甲基亚砜，M=Mn、Fe 和 Co，用于 1-3），是通过 MCl2、DMSO 和 pz 的溶剂热反应合成的。通过引入 DMSO 和氯离子作为电子给体配体以及 pz 作为受体，构建了一个给体-金属-受体（D-M-A）体系。光诱导电子转移（PET）从给体到受体产生的自由基导致在 UV 区域的振子吸收光谱发生显著变化，并显著增强了磁化率。通过 PXRD、IR、EPR 和 XPS 测量确定了 PET 的机制。这是首例在 PET 过程中同时表现出光致变色和光磁性质的桥连 pz 配合物的例子。
