DETERMINATION OF LIGAND TO METAL ION MOLAR RATIO IN THE FORMATION OF PHENANTROLINE COMPLEXES USING A SMARTPHONE

• Main Author: AYU SAPUTRI (NIM: 90515002), VINDY
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24646
• Institution: Institut Teknologi Bandung

The stoichiometry ratio of the nickel(II)-phenantroline and cobalt(II)-phenantroline complexes has been determined by simple analytical method using a smartphone. Intensity values were obtained from the digital images by measuring the RGB (red, green, blue) value on scale of 0-255 in intensity of the M(II) and phenantroline solution using digital camera from a smartphone. The R channel showed the best linearity for predicting the stoichiometry ratio from nickel(II)-phenantroline and cobalt(II)-phenantroline. Plot of red intensity against mol ratio of Ni2+/phenantroline reached the maximum value on mol ratio Ni2+/phenantrolin of 1:3, which indicates that Ni2+ and phenantroline form complexes with 6 coordination number (phenantroline is bidentat ligan). Red intensity for the mixture of Co2+ and phenantroline also reached maximum value on mol ratio Co2+/phenantrolin of 1:3. The same mol ratio of M2+/phenantroline for the both complexes were also obtained using spectrophotometry UV-Vis analysis. Based on the result of this research, an online laboratory modules have been created based on smartphone application as a learning companion media for complex material.