Six 5,5 0 -azotetrazolate based supramolecular complexes of {[Co(en) O} (5) and {[Cu(en) 2 (trans-AT) 0.5 ](trans-AT) 0.5 } (6) (en ¼ ethylenediamine) have been synthesized and characterized by single crystal X-ray diffraction analysis. The trans-AT 2À anions in 1-6 show four different coordinating modes. In 1-6, the unusual face-to-face AT 2À -AT 2À p À -p À stacking interactions with the separated interplanar center to center distances ranging from 3.32 to 4.0 A were observed. The p À -p À stacking, hydrogen bonding and electrostatic interactions are responsible for the stabilization of these 3D supramolecular structures. The aqueous solutions of 1-6 with the concentration of 2 Â 10 À5 mol L À1 show photochromism that originates from the trans-cis isomerisation of AT 2À anionic ligands. The onion cell imaging with 1-6 as labels has also been reported.
Two hydrated 5-azotetrazolyl salicylic acid (H3ASA) of [(H3ASA)·H2O] (1) and [(H3ASA)·4H2O] (2) and five H3ASA based dinuclear Ln(3+) complexes of {[Ln2(H1.5ASA)4(H2O)8]·6H2O} [Ln = Dy (3), Tb(4)], {[Gd2(H1.5ASA)4 (H2O)8]·5H2O} (5), {[Sm2(H1.5ASA)4(H2O)8]·6H2O} (6) and {[Eu4(H1.5ASA)8(H2O)18]·10H2O} (7) have been synthesized and characterized by single crystal X-ray diffraction analysis. In 1 and 2, the neutral H3ASA molecules show a trans-enol-E isomer but display two different dihedral angles. Complexes 3-7 exhibit three types of dinuclear structures in which the anionic ligands show two trans-enol-E/Z isomers. The photochromic and photoluminescent properties of 1, 3-7 and the magnetic properties for 3-7 were investigated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.