Peripherally and non-peripherally tetra substituted cobalt(II) and copper(II) phthalocyanines were pre-pared and characterized via spectroscopic techniques. The electrochemical characterization of metallo-phthalocyanines were carried out to determine electrochemical behaviors. Electrochemical results of com-plexes were supported with the in-situ spectroelectrochemical measurements. Complexes having piperi-dine functional groups were electropolymerized on glassy carbon electrode surface. Sensor performances were investigated toward ascorbic acid, dopamine, uric acid. Non-peripheral cobalt(II) phthalocyanine ex-hibited a good linear relation in the concentration range of 1.4-60 mu M with sensitivity of 0.49 mu A mu M-1 and low detection limit of 0.92 mu M for electrochemical determination of ascorbic acid. Non-peripheral copper(II) phthalocyanine demonstrated high sensitivity (0.52 and 1.31 mu A mu M-1) and low detection limit (1.92 and 2.61 mu M) especially for ascorbic acid and uric acid, respectively.(c) 2022 Elsevier B.V. All rights reserved.