One-Dimensional Coordination Polymers of Bis(3-pyridyl-acrylamido)ethane: Influence of Anions and Metal Ions on Their Solid State [2 + 2] Photochemical Polymerization and Dimerization Reactions

Abstract

The coordination polymers (CPs) of bis(3-pyridyl-acrylamido)ethane (L) with nitrate, acetate, and perchlorate salts of Cu(II), Cd(II), and Zn(II) were synthesized, and their crystal structures have been analyzed with respect to the influence of anions, hydrogen bonding, and their solid state [2 + 2] photochemical reactivity. Four out of the six CPs (1–4) containing NO3– and AcO– ions were found to form one-dimensional chains and exhibit solid state [2 + 2] reactivity. Two CPs (5–6) containing ClO4– ions were found to form ML2 discrete complexes which are photostable. The CPs 1 and 4 were found to form single [2 + 2] dimers, while 2 and 3 resulted in the formation of polymers via solid state [2 + 2] polymerization upon irradiation. The photoproducts are characterized by 1H NMR, electrospray ionization mass spectrometry, and matrix-assisted laser desorption/ionization–time of flight (MALDI-TOF) spectra. The dimer was charecterized by single crystal X-ray structure determination. The MALDI-TOF analyses of po...