Study On Salamo-like Chemosensors For Identification Of S^2- And Their 3d-4f Coordination Complexes

In the past few decades of scientific research,the salen metal complexes have a wide range of applications,including key research areas such as biological activity,nonlinear optical materials,and magnetic materials.In recent years,salamo-type compounds and salamo-type metal complexes derived from salen-type compounds have become a new research direction in the discipline of coordination chemistry.Compared with the salen type compound,the salamo type compound has better coordination performance.During the coordination process with the metal atom,hydrolysis reaction is not easy to occur,and it is easier to form a metal complex with a novel structure.In terms of property research,some salamo-type metal complexes can be used as oxygen carriers,so they can be used as templates for metalloproteins,and some salamo-type multinuclear metal complexes can also be used as catalytic materials for certain organic reactions.On the one hand,the Salamo type 3d-4f complex also has good prospects and applicability in the current material field.Successfully designed and synthesized a salamo type hexadentate bioxime ligand H₂L¹ based on 3-methoxysalicylic aldehyde,and synthesized its two 3d-4f heterobinuclear metal coordination polymers 1 and 2,through X-Ray single crystal diffractometer to determine the crystal structure of these two 3d-4f heterobinuclear metal coordination polymers,Infrared spectroscopy and other methods to characterize and study the ligand H₂L¹ and its two 3d-4f heterobinuclear metal coordination polymers.At the same time,the biological antibacterial activity of the 3d-4f heterobinuclear metal coordination polymer was further studied.The two 3d-4f heterobinuclear metal coordination polymers had good antibacterial effects on Staphylococcus aureus.Coordination polymer 1:_∞¹[Ni（L）Sm（NO₃）₃（4,4?-bipy）]:molecular formula,C₂₈H₂₆N₇NiO₁₅Sm,,molecular weight,909.62,Monoclinic,space group,P2₁/c,unit cell parameters:a=11.3928（4）?,b=19.4539（7）?,c=19.4229（8）?,β=98.689（2）°,Z=4,V=4255.4（3）?³,R₁=0.0405,wR₂=0.1063;Coordination polymer 2:_∞¹[Ni（L）Eu（NO₃）₃（4,4?-bipy）]:molecular formula,C₂₈H₂₆EuN₇NiO₁₅,molecular weight,911.23,Monoclinic,space group,P2₁/c,unit cell parameters:a=11.3952（4）?,b=19.5372（6）?,c=19.3911（9）?,β=98.646（4）°,Z=4,V=4268.0（3）?³,R₁=0.0326,wR₂=0.0784;On the other hand,with the in-depth discussion of ion detection,it is found that ion detection has played an important role in the application of biological,chemical and environmental fields,and due to the detection and control of chemical trace formation technology is getting more and more widely Attention and application,the development of sensors for detecting anions and cations becomes necessary.The identification performance and mechanism of two new salamo fluorescent ultraviolet dual-channel sensors for metal cations and anions were studied.Among them,the salamo type hexadentate double oxime probe H₂L¹ based on 3-methoxysalicylic aldehyde can achieve a single recognition of Cu²⁺ions in an organic solvent containing water.H₂L¹ found that H₂L¹ and Cu²⁺ions formed In addition to the complex L¹-Cu²⁺,the fluorescence intensity is almost quenched.In the competition experiment conducted,it was found that the L1-Cu2+system has good anti-interference performance.In the anion full scan experiment,H₂L¹ can complete the UV-fluorescence dual-channel recognition of S2-ions.At the same time,through the pH response experiment,it was found that the probe H₂L¹ can recognize ions in a wider pH response range and have higher stability.At the same time,the salamo type hexadentate double oxime sensor H₂L² based on2-hydroxy-5-bromobenzaldehyde is almost identical to the recognition site of S^2-ion by H₂L¹,so it can also complete the ultraviolet fluorescence dual-channel recognition of S^2-ion.At the same time,the probe H₂L² conducted a pH response and stability exploration experiment,and found that probe H₂L² has a wider pH response range and higher chemical stability.It is expected to be expanded in macroscopic recognition methods such as H₂S gas recognition,filter paper recognition and naked eye recognition.