The development of porphyrin-based metal− organic frameworks (MOFs) has attracted significant interest in the scientific community in recent years because of their versatile applications particularly in optical and electronic fields. In this study, a highly selective and sensitive fluorescent turn-on sensor using a porphyrinic MOF, Tb−TCPP, is presented, which displays a 10-fold fluorescence enhancement in the presence of Al 3+ , Cr 3+ , and Fe 3+ ions. The detection limit is in the nM region. For the Al 3+ ion, it could be visually detected at concentrations as low as 5 mM within 15 min. Tb−TCPP could also be used as an indicator for acidic or alkaline solutions at pH values of >9 and <3. The studies on the detection mechanism illustrate that cation exchange proceed between Tb−TCPP and these M 3+ ions, and consequently, energy transfer from TCPP to Tb 3+ is suppressed and π*−π energy transfer of the porphyrin ligand is significantly enhanced.

Photodynamic therapy (PDT) has been rapidly developing an effective therapeutic approach in clinical. However, hypoxia seriously limits the effectiveness of PDT. Here, we report a porphyrinic based metal-organic framework combined...

Photodynamic therapy (PDT) has become a promising therapeutic approach in clinical. How to improve the efficiency of PDT is still a research hotspot due to tumor hypoxia and insufficient aggregation...

For the interpolating element-free Galerkin (IEFG) method set up by combining the shape function constructed with interpolating moving least-squares (IMLS) approximation and Galerkin integral weak form of partial differential equation, we show that the task of accuracy analysis of the IEFG method in solving transient heat conduction problems can be reduced to the estimation of errors in the procedure of IMLS approximation and the integral weak form of heat conduction equation. Following this practice, accuracy analysis of IEFG method is derived. To illustrate our results, numerical tests are discussed by two examples and give an optimal convergence rate with respect to two types of norm.