Synthesis, structure and optical properties of two uranyl oxalate complexes templated by protonated amines
2017
[C 6 H 14 N] 4 [UO 2 (C 2 O 4 ) 2 (HC 2 O 4 )]NO 3 ·2H 2 O ( CHA ) and [C 8 H 18 N][UO 2 (C 2 O 4 )(NO 3 )] ( NNDMCHA ) were synthesized by volatile method
at room temperature, using [C 6 H 14 N] + and [C 8 H 18 N] + as templates, respectively.
The structures and optical properties were characterized by combination
of single-crystal X-ray diffraction, PXRD, TG-DSC, IR, Raman, UV-Vis
and fluorescence spectra. CHA and NNDMCHA crystallized in monoclinic system, and space group P 2 1 /c. The equatorial coordination number of CHA and NNDMCHA are 5 and 6, respectively, forming pentagonal
bipyramid and hexagonal pyramid. The lattice water in CHA formed O–H···O hydrogen bonds with the oxygen
atoms of the mononuclear anions, resulting in a s-shaped anion chain
which extended along the c direction. The protonated
amines were linked to the anion chains by N–H···O
and C–H···O hydrogen bonds, leading to form
the larger hexagon and the smaller parallelogram pores, respectively.
The photoflurescence of two complexes significantly decreased when
exposure under UV light, showing potential application for fluorescent
sensor.
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