Fluorescent properties and synthesis of porphyrin square recognized methylene crown ether

New porphyrin square (1) was prepared by reaction of porphyrin containing pyridine and Re$(CO)_5Cl$ in THF/toluene solvent. 2-(Methylene15-crown-5)-nicotinoly ester(2) was synthesized by reaction of 2-(Hydroxymethyl-15-crown-5 and nicotinoly chloride in $CH_2Cl_2$. In fluorescence quenching studies luminescence was quenched by addition of the guest(2) into host(l). In the host-guest system we could obtain binding constant (K= $1.13{\times}10^{7}M^{-1}$) at decreasing concentration of (2). But the luminescence was dramatically increased after $Na^{+}$ was added into the host-guest system.