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A novel type of transition bimetal–organic frameworks was described as a heterogeneous catalyst for the oxidative coupling of amines to imines under mild conditions, which was easily synthesized by the coordination assembly of manganese(II) and cobalt(II) with 1,3,5-benzenetricarboxylic acid (H3BTC) for the first time. The metal–organic framework material was characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, thermogravimetry and N2 sorption. As an environmentally benign heterogeneous catalyst, the catalytic ability of the metal–organic framework material was then detected to be excellent for the tert-butyl hydroperoxide (TBHP) promoted direct oxidative coupling of benzylamines to imines in excellent yields (up to 100%) in methanol for 3 h. More importantly, it could be recycled up to six runs, while still maintaining its high catalytic activity.

Herein, we reported a facile route to fabricate carbon and Au treated TiO 2 mesoporous hollow spheres (MHTiO 2 @C–Au) as high performance anode materials for lithium ion batteries. The high porosity of the hollow spheres, together with the inner carbon supporting and superficial Au coating, enhanced the cycling stability and rate performance of the MHTiO 2 @C–Au electrode significantly. The MHTiO 2 @C–Au composite exhibits a high reversible specific capacity of 186.6 mA h g −1 after 200 cycles at the current density of 1.0C, superior rate performances of around 151.0 mA h g −1 at the current rate of 5.0C. The outstanding electrochemical property is attributed to the overall structural features of the MHTiO 2 @C–Au, which can not only shorten the diffusion path of lithium ions and electrons, but also improve the stability of the hollow structures during the lithium ion insertion and extraction process.

A novel type of transition bimetal–organic frameworks was described as a heterogeneous catalyst for the oxidative coupling of amines to imines under mild conditions, which was easily synthesized by the coordination assembly of manganese(II) and cobalt(II) with 1,3,5-benzenetricarboxylic acid (H3BTC) for the first time. The metal–organic framework material was characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, thermogravimetry and N2 sorption. As an environmentally benign heterogeneous catalyst, the catalytic ability of the metal–organic framework material was then detected to be excellent for the tert-butyl hydroperoxide (TBHP) promoted direct oxidative coupling of benzylamines to imines in excellent yields (up to 100%) in methanol for 3 h. More importantly, it could be recycled up to six runs, while still maintaining its high catalytic activity.

A novel targeted MRI contrast agent for tumor cells and tumor over-expressing affinity receptor was synthesized and characterized. Dopamine (DA) was used to present functional molecules on the surface of superparamagnetic iron oxide nanoparticles (SPIONs), and dextran was conjugated with the folic acid (FA) that forms stable nanocomposites. The T2 values of the targeted and non-targeted nanoparticles at 3.0 T were 10.9 ms and 11.8 ms, respectively. The T2 relaxivity values (r2) were 91.7 s−1 mM−1 and 84.7 s−1 mM−1, respectively. The results of the competitive inhibition test suggest that the SPION-DA-dextran-FA uptake is associated with folate receptor binding. In the in vitro study, the T2 signal intensity of hepatic carcinoma cells (Bel 7402) incubated with the folate targeting nanocomposites decreased significantly. In contrast, the T2 signal did not show an obvious decrease for cells treated with the non-targeting nanocomposites. In the in vivo study, the T2 signal decreased significantly 18 hours after injection of the folate targeting contrast agent. In contrast, the maximum intensity of the non-targeting group appeared 0.5–2 hours after injection and the T2 signal intensities recovered gradually 4 hours after injection. Our results indicated that FA targeting SPIONs have the ability for use as a novel targeting MRI contrast agent and have a better targeting tropism to the Bel 7402 cells and tumor.