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In this study, a novel mercapto-terminated trinuclear Ni(II) complex (Ni3) was synthesized and used as electrocatalysts for the detection of hydrazine hydrate in real water samples. The as-prepared Ni3 molecules possess six thiomethyl groups at the periphery of the complex;such SCH 3 groups can react with Au electrodesto immobilize the Ni3 molecules on their surface through the formation of a self-assembled monolayer. The Ni3-modified Au electrode (Ni3/Au) demonstratedits excellent electrocatalytic activity for the oxidation of hydrazine hydrate through the significant decrease in the overpotential.Chronoamperometry study showed a diffusion coefficient (D) of 5.82×10 −5 cm 2 ·s −1 and acatalytic rate constant of 8.57×10 3 M −1 ·s −1 . Using square wave voltammetry (SWV) technique, this Ni3/Au electrodebased hydrazine hydratesensor exhibiteda high sensitivity in quantitive analysis, and the detection limit could be as low as ~0.07 μM with a linearity ranging from 0.2 to 50 μM. Additionally, the good reproducibility, anti-interference performance, and long-term stability made the proposedsensor be capable of detecting trace level of hydrazine hydrate in real water samples.

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Polyimides exhibit outstanding thermal and thermo‐oxidative stability, excellent solvent resistance, good mechanical and electrical properties and superior chemical resistance. However, their practical applications are frequently limited by their infusible and insoluble nature. Structural modifications of the polymer backbone have been utilized to modify polyimide properties, either by reducing the interaction or by reducing the stiffness of the polymer backbone. Novel organo‐soluble polyimides containing spirobifluorene units were synthesized by the polycondensation of 2,7‐bis‐amino‐2′,7′‐di‐t‐butyl‐9,9′‐spirobifluorene with three aromatic dianhydrides. The one‐step polymerization procedure was conducted at 200 °C in m‐cresol, and the structures of the resulting polyimides were confirmed using infrared and NMR spectroscopy. The weight‐average molecular weights and polydispersities of the resulting polymers were in the ranges 20 600–341 000 and 1.02–1.30, respectively. The glass transition temperatures of the polyimides were in the range 289–322 °C, and the 10% weight loss in nitrogen appeared at a temperature higher than 435 °C and the residual weight at 800 °C was above 58%. The spiro segment has been introduced into polyimides, resulting in amorphous polyimides, conferring on them an enhanced solubility and leading to a significant increase in both glass transition temperature and thermal stability. These types of materials have potential for many applications. Copyright © 2010 Society of Chemical Industry