title: Sandwich-type tetranuclear lanthanide complexes with cucurbit[6]uril: from molecular compounds to coordination polymers.
abstract: Sandwich-type lanthanide complexes with macrocyclic ligand cucurbit[6]uril (C 36H 36N 24O 12, CB[6]) were synthesized under hydrothermal conditions from aqueous solutions of lanthanide(III) bromides, CB[6], and 4-cyanopyridine. According to X-ray analysis (Ln = La, Pr, Dy, Ho, Er, and Yb), the compounds with different structural types of lanthanide cores have a common fragment where the tetranuclear hydroxo complex is sandwiched between two macrocycles {(IN@CB[6])Ln 4(mu 3-OH) 4(IN@CB[6])} (6+) (IN = isonicotinate). The photoluminescence (for Ln = Eu) and Fourier transform ion cyclotron resonance mass spectra (for Ln = Pr, Dy, and Er) were studied. The compounds are used for the first time as precursors for the synthesis of lanthanide-silver heterometallic coordination polymers. The chainlike crystal structure of polymers (Ln = La, Pr, and Dy) is constituted by the sandwich complexes linked via the coordination of IN nitrogen atoms to the silver atoms.
authors.affiliation: Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Lavrentiev Avenue 3, Novosibirsk 630090, Russia.
authors.forename: Olga A
authors.initials: OA
authors.lastname: Gerasko
authors.forename: Ekaterina A
authors.initials: EA
authors.lastname: Mainicheva
authors.forename: Marina I
authors.initials: MI
authors.lastname: Naumova
authors.forename: Marco
authors.initials: M
authors.lastname: Neumaier
authors.forename: Manfred M
authors.initials: MM
authors.lastname: Kappes
authors.forename: Sergey
authors.initials: S
authors.lastname: Lebedkin
authors.forename: Dieter
authors.initials: D
authors.lastname: Fenske
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Fedin