Synthesis, characterization and the structural study of trinuclear complexcobalt of Schiff base ligand

Compared to conventional electrodes, chemically modified electrodes (CMEs) offer unique well recognized advantages, especially in situations where the target analyte requires high overpotential, i.e. electrocatalysis, and also electroanalysis [1-4]. This characteristic of chemically modified electrodes arises from the advantageous combination of conventional electrochemical techniques with the chemical, structural and other specific properties of the modifying layer(s) [5-8]. A new room temperature ionic liquid has been used as a new kind of modifier for a chemically modified electrode [9-12]. This room temperature ionic liquid is composed entirely of ions and exists as a liquid at room temperature with the characteristics of negligible vapour pressure and good solubility and chemical stability. As a new green media, the room temperature ionic liquid has many unique optical and electrochemical properties, such as higher ionic conductivity and wider electrochemical windows [13– 18]. Ascorbic acid (AA), also known as vitamin C, is found in numerous natural sources. Its determination has received great attention in analytical chemistry due to the wide use in soft drinks and drugs [19]. It is also important clinically to determine its concentration in blood, urine [20] and tissues. Its quantification in foods and beverages has received increasing importance [2123]. For the determination of ascorbic acid, several analytical methods have been proposed such as chromatography [24, 25], spectrophotometry [26, 27], mass spectrometry [28], flow injection [29, 30], chemiluminescence and electrochemical methods [31, 32] have been proposed for its determination in different matrices and at different levels. 1 Department of Food Science, Science and Research Branch, Islamic Azad University, Mazandaran, Iran 2 Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran 3 Department of Chemistry, Science and Research Branch, Islamic Azad University, Mazandaran, Iran Article history: Received: 23 September 2012 Received in revised form: 20 November 2012 Accepted: 19 December 2012