Two dimensional asynchronous spectra were used to characterize coordination between carbonyl group of butanone and metal ions by using an approach proposed in our recent paper.Spectral variation of n-π~*transition band of carbonyl group is used to probe the coordination even if metal ions does not possess any characteristic peak in spectra.Experimental results indicate that Ca^(2+) and Al^(3+) show considerable ability to coordinate with the carbonyl group of butanone and bring about spectral variation of the n-π~*transition band,which is manifested by cross peaks in 2D asynchronous spectra.
In this paper,2D asynchronous spectra generated by using the DAOSD approach was utilized to probe interactions between Nd^(3+) and pyridinium dissolved in aqueous solution.A series of cross peaks in the resultant 2D asynchronous spectrum confirms the occurrence of intermolecular interaction between Nd^(3+)and pyridinium.However,no coordination occurs between Nd^(3+) and pyridinium.Interaction between πelectron from aromatic system and/electron from lanthanide ions account for the appearance of cross peaks in 2D asynchronous spectra.Because of the interaction,the emission spectrum of pyridinium exhibits a significant change when neodymium perchlorate was introduced into the system.
A Keggin-type polyoxomolybdate[H_2biim]{Ni(biim)_3(SiMO_(12)O_(40))}[biim =1H,1'H-[2,2']biimidazolyl]has been synthesized under hydrothermal condition and characterized by XRD,temperature-dependent IR,TG,temperature-induced and magnetism-induced 2D infrared correlation spectroscopy(2D-IR COS)and UV-vis DRS in order to explore the relationship between structure and properties.Temperatureinduced 2D-IR COS spectroscopy indicates that the terminal Mo-O_(μ/υ) bonds are more sensitive than the bridging Mo=O_t,bands to temperature variation,which is in agreement with the conclusion of temperature-dependent IR.Magnetism-dependent 2D-IR COS spectroscopy reveals the stretching vibration of the Mo=O_t,occurs prior to the stretching vibration of the Mo-O_(μ/υ),which is due to the coordination environment and the valence of the Si atom.The stability of compound 1 is investigated via TG and temperature-dependent IR.In RhB degradation,compound 1 shows good photocatalytic abilities.
Hao WangYi-Ping ChenZhu-Chai YouMeng-Xi ZhouNing ZhangYan-Qiong Sun
