Rhodamine-dimethyliminocinnamyl based electrochemical sensors for selective detection of iron (II)

• Published in: Sensors and actuators. B, Chemical Chemical, 2014-01, Vol.190, p.127-133
• Main Authors: Kamal, Ajar, Kumar, Naresh, Bhalla, Vandana, Kumar, Manoj, Mahajan, Rakesh Kumar
• Format: Article
• Language: English
• Subjects: Coated graphite electrode; Interference; Potentiometry; Rhodamine-dimethyliminocinnamyl; Voltammetry
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2013.08.079

A new dimethyliminocinnamyl linked rhodamine (rhodamine-dimethyliminocinnamyl) (RC) has been explored as an electro-active material to prepare voltammetric and potentiometric sensors for the quantification of Fe (II) ions. In voltammetry, RC shows two anodic peaks at 0.4V and 0.9V vs. Ag/Ag+ potential which get quenched and a new cathodic peak appeared at more negative potential (−0.5V) on addition of Fe (II) which is due to the reduction Fe (II) complex formed with rhodamine dimethyliminocinnamyl. Voltammetric sensor can work within the concentration range of 2.0×10−6 to 3.0×10−4M with detection limit of 1.6×10−7M. In potentiometric mode, constructed PVC based solid contact coated graphite electrode (CGE) showed Nernstian slope of 29.4mV/decade of Fe (II) concentration over a linear range of 1.0×10−1 to 1.0×10−7M with detection limit of 7.43×10−8M. In the proposed sensors, negligible interference from alkali, alkaline and transition metal ions have been observed and show outstanding analytical performance with different type of sample matrices.