Sonochemical Synthesis Of A Trinuclear Cu(Ii) Complex With Open Coordination Sites For The Differentiable Optical Detection Of Volatile Amines

A discrete trinuclear Cu(ii) complex, namely, [Cu-3(pzdc)(2)(dpyam)(2)(H2O)(4)] (1) (H(3)pzdc = pyrazole-3,5-dicarboxylic acid, dpyam = 2,2 '-dipyridylamine) was simply synthesized by the sonochemical process and structurally characterized. The single-crystal X-ray diffraction analysis revealed that three adjacent Cu(ii) centers are linked via two bridging pzdc ligands to form a trinuclear Cu(ii) unit. Each trinuclear Cu(ii) unit contains open coordination sites with two trigonal bipyramidal Cu(ii) centers and one elongated octahedral geometry. Moreover, the open coordination site of 1 was occupied by a small molecule, leading to the guest-induced structural transformation with chromism that was verified by FT-IR, UV-vis diffuse reflectance spectra, elemental analysis, PXRD, and SEM techniques. Compound 1 exhibits color change along with structural transformation in methanol media and after the dehydration process. Also, 1 shows different color responses after exposure to different amine vapors. In addition, compound 1 was conveniently deposited onto a filter paper by a sonochemical method used as a portable test strip for the discriminative qualitative detection of amines.