title: Syntheses, structures and properties of 5-azotetrazolyl salicylic acid and its dilanthanide complexes.
abstract: 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.
authors.affiliation: School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou, 510006, China. dw320@aliyun.com.
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Chen
authors.forename: Zhi-Xin
authors.initials: ZX
authors.lastname: Li
authors.forename: Xin-Wei
authors.initials: XW
authors.lastname: Yu
authors.forename: Meng
authors.initials: M
authors.lastname: Yang
authors.forename: Yan-Xuan
authors.initials: YX
authors.lastname: Qiu
authors.forename: Wen
authors.initials: W
authors.lastname: Dong
authors.forename: Ya-Qiu
authors.initials: YQ
authors.lastname: Sun