TITLE:
Reaction in situ found in the synthesis of a series of lanthanide sulfate complexes and investigation on their structure, spectra and catalytic activity
AUTHORS:
Zhaoyan Deng, Fengying Bai, Yongheng Xing, Na Xing, Liting Xu
KEYWORDS:
Lanthanide Sulfates; Hydrothermal Synthesis; Crystal Structure; Photoluminescent Properties; Catalytic Reaction
JOURNAL NAME:
Open Journal of Inorganic Chemistry,
Vol.3 No.4,
October
16,
2013
ABSTRACT: A series of lanthanide sulfates
coordination complexes, Ln2(SO4)3(H2O)8 (Ln = Pr (1), Nd (2), Tb (3), Sm (4), Dy (5), Gd (7), Ho (8)), and EuK(SO4)2 (6), were constructed by the reaction in situ of lanthanide ions (Ln3+)
with flexible dodecanedioic acid and rigid aromatic 5-sulfosalicylic acid under
hydrothermal conditions. All of them were characterized by elemental
analysis, IR spectroscopy, and single-crystal X-ray diffraction. The crystal
structures and coordination modes of metal centers and sulfate ions, as well
as the novel reaction mechanism and different conditions of lanthanide ions
and 5-sulfosalicylic acid to form the series of lanthanide sulfate complexes,
were discussed in detail. Solid-state properties for these crystalline
materials, such as thermal stability and powder X-ray diffraction have been
investigated. Additionally, the photoluminescent characterizations of the
complexes 3, 4, 5 and 6, and the catalytic properties of all the complexes
about cyclohexane being oxidized into cyclohexanone/cyclohexanol were investigated and compared.