Study On Binary And Ternary Hybrid Supramolecular Hydrogels As Efficient Room Temperature Phosphorescent Matrixes

The analysis method based on room temperature phosphorescence?RTP?has attracted more and more attention due to its good selectivity and high sensitivity.At present,the method of enhancing RTP is mainly to design and synthesize new phosphorescent molecules or to develop a new matrix.However,these methods are time consuming.Therefore,how to enhance the phosphorescence intensity through a convenient method is still a big challenge.In this paper,based on hybrid gels can formed multiple ordered structures that can limiting effect on phosphorescence molecules,and the RTP intensity will be enhanced.The following are studied:Firstly,a binary hybridized supramolecular gels which formed by sodium deoxycholate?NaDC?and gelator N.N'-dibenzoyl-L-cysteine?DBC?was prepared,which was used to as matrix induce RTP of meso-tetra?carbonyl phenyl?porphin palladium?Pd-TCPP?without oxygen scavengers or heavy atoms.The mechanism of RTP induced by binary hybrid gel was characterized by IR,SEM and other methods.It was found that Pd-TCPP enters into the hydrophobic cavity of NaDC aggregates through hydrophobic and hydrogen bonding,and the hydrogen bonding between NaDC and DBC gel factors forms a denser three-dimensional network structure.It is due to Pd-TCPP is in a double-ordered structure composed of NaDC aggregates and DBC supramolecular gels,which greatly limits the non-radiative transition of Pd-TCPP and leads to the generation of RTP.In the second part,a ternary micelle-hybridized supramolecular hydrogels were constructed through the self-assembly of gelator N,N-dibenzoyl-L-cystine?DBC?and micelles formed from a Gemini surfactant(G_12-8-12)and Al³⁺.As a ternary gel matrix,the RTP of Pd-TCPP can be efficiently induced compared with binary hybridized gel?G/DBC?.The mechanism of the designed ternary gel enhanced RTP of Pd-TCPP was characterized by NMR,SEM,TEM and surface tension.The results indicated that Al³⁺in ternary hybridized enhanced the surface activity of Gemini surfactant to form more micelles,thus increasing the dispersion of Pd-TCPP in ternary hybridized gels;In addition,the interactions between Al³⁺and DBC producing a more compact 3D network structur,as well as the interaction between Al³⁺and Pd-TCPP,the synergy between the three reduces the non-radiative transition caused by collisional quenching of Pd-TCPP,which effectively sensitizes the room temperature phosphorescence.This system has no need oxygen scavengers or heavy atoms.The G/Al/DBC three-way hybrid supramolecular gel can measure Hg²⁺using the thiophilicity of mercury ions.The results of this study provide new ideas for the enhancement of room temperature phosphorescence using metal ions,and provide a new method for the detection of mercury ions.