Spectroscopic and electrochemical properties of Cu-dicyandiamide complex

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（3）
• 页码范围: 360-367
• 页数: 8页
• 语种: 英文

摘要

Dicyandiamide (DICY) is a common ligand that exhibits low toxicity but can irritate the skin and eyes and cause methemoglobinemia on long-term exposure.Crystalline Cu-dicyandiamide (Cu-DICY) was obtained via facile synthesis and its molecular structure and theoretical Raman spectra were simulated by using density functional theory (DFT).The results suggested that the Cu2+ coordinates with two H2O molecules and two different DICY molecules (an imino DICY and an amino DICY).The stability constants of Cu-DICY were calculated,and the electrochemical properties were studied.Two electrochemical redox processes occur in Cu-DICY in an aqueous solution:a reversible reaction with a formal potential of 0.2 V vs.MSE and an irreversible reaction between-).4 and-1.2 V vs.MSE.The standard rate constant k0 for the reversible reaction was estimated to be 7.6× 10 3 cm/s.In addition,based on the reversible reaction of Cu-DICY,square wave voltammetry was used to rapidly determine the concentration of Cu(Ⅱ) and the detection limit was 66.7 μg/L,which satisfies the detection limit requirements for copper in tap water (2 mg/L) as provided by the World Health Organization.