Henan Normal University

About: Henan Normal University is a education organization based out in Xinxiang, China. It is known for research contribution in the topics: Catalysis & Ionic liquid. The organization has 10863 authors who have published 11077 publications receiving 166773 citations.

Syntheses, structures and luminescent properties of zinc(II) coordination polymers based on bis(imidazole) and dicarboxylate

Abstract: Five zinc(II) coordination polymers with 5-methylisophthalic acid (H2L1), 5-methoxylisophthalic acid (H2L2) and bridging bis(imidazole) ligands, [Zn(L1)(biim-3)]n (1), [Zn(L1)(biim-6)]n (2), [Zn(L1)(biim-5)]n (3), [Zn(L2)(biim-3)]n (4) and [Zn(L2)(biim-6)]n (5) (biim-3 = 1,3-bis(imidazole)propane, biim-5 = 1,5-bis(imidazole)pentane, biim-6 = 1,6-bis(imidazole)hexane), have been hydrothermally synthesized and structurally characterized. Compound 1 shows a two-dimensional (4,4) net which contains left- and right-handed helical chains. Compounds 2 and 3 are both 3-fold parallel interpenetrated 2D → 3D architecture while 4 shows a 2-fold parallel interpenetrated 3D → 3D architecture and contains two kinds of chiral layers. Compound 5 exhibits a 2-fold parallel interpenetrated 2D → 2D (4,4) net. Furthermore, luminescent properties and thermo-gravimetric properties of these compounds were investigated. The results suggest that both carboxylate and bis(imidazole) ligands influence on the final resulting complexes.

Structural and electronic properties of NM-doped ceria (NM = Pt, Rh): a first-principles study

Abstract: The effects of noble metal (NM) dopants (NM = Pt, Rh) on the structural and electronic properties of ceria are studied using a density functional theory (DFT) method, with the inclusion of on-site Coulomb interaction (DFT + U). It is found that these NM dopants give rise to large perturbations of the atomic and electronic structures of ceria and induce metal-induced gap states at the Fermi level suitable for accommodating extra electrons, thereby lowering the reduction energy of ceria and making the NM-doped cerias more reducible than pure ceria. This mechanism for facilitating the reduction of ceria is different from that of Zr-doped ceria where the increased reducibility is largely due to the structural distortions and not to electronic modifications.