2维Zn-LCP纳米材料荧光感应Cr_(2)O_(7)^(2-)和L-胱氨酸的研究

The Study of Fluorescence-Sensing Cr_(2)O_(7)^(2-)and Amino Acid by 2D Zn-LCP Nanomaterial

该文利用柔性间苯二乙酸(H_(2)mpda)和刚性共轭体均苯三咪唑(tib)水热合成发光配位聚合物[Zn_(3)(tib)_(2)(mpda)_(3)]_(n)·5H_(2)O(Zn-LCP).mpda^(2-)的2个羧基均与金属Zn(Ⅱ)单齿配位形成1维波浪链,tib作为三节点与金属Zn(Ⅱ)配位形成1维带状链,2个链通过Zn(Ⅱ)交接构成2维面,面与面通过π-π作用力堆积形成3维超分子体.Zn-LCP比表面积(BET)为19 m^(2)·g^(-1),量子产率为25.22%.Zn-LCP具有较好的荧光性能,对在水中的Cr_(2)O_(7)^(2-)离子和L-胱氨酸感应良好,检出限分别为0.34μm^(-1)和3.6 nmol·L^(-1),荧光猝灭率分别为68.3%和98.3%,高于文献报道值.其荧光猝灭机理是共振能量转移和竞争吸收.

Flexible interphenyldiacetic acid(H_(2)pda)and rigid conjugate isobenzene triimidazole(tib)are used to synthesize the luminescent coordination polymer[Zn_(3)(tib)_(2)(mpda)_(3)]_(n)·5H_(2)O(Zn-LCP).Both carboxylic groups of mpda^(2-)coordinate with Zn(Ⅱ)to form a 1D wave chain,tib as three nodes coordinate with Zn(Ⅱ)to form a 1D ribbon chain,the two chains form^(2)D surfaces through Zn(Ⅱ),throughπ-πforce accumulates to form a 3D supramolecular structure.The surface area(BET)is 19 m^(2)·g^(-1),the quantum yield is 25.22%.Zn-LCP has good fluorescence performance,good induction of Cr_(2)O_(7)^(2-)and L-cystine in water,detection limit(LOD)is 0.34μm^(-1)and 3.6 nmol·L^(-1)respectively,and fluorescence quenching rate is 68.3%and 98.3%respectively,which is hi-gher than that reported in the literature.The fluorescence quenching mechanism of Zn-LCP is caused by resonance energy transfer(RET)with competitive absorption(CA).