Journal of Textile Science & Engineering

Synthesis of Aminothiophene Substituted Squarylium Dyes and Study of their Electrical Conductivity Properties

Abstract

F. A. Imadegbor*, K. A. Bello, P. O. Nkeonye and A. Giwa

Squarylium dyes are organic dyes of intense flouresence properties typically in the red to near- infrared region obtained from squaric acid. Squarylium dyes were synthesized from aminothiophene which are low molecular weight compound with good electron donating properties. The molecular weight of the dyes ranges from 276- 434 g/mol with melting point of spanning from 314–336 0C. The FT-IR of band of the squarylium dyes showed sharp absorption bands of 3224.1-3649.1 cm-1 corresponding to the N-H stretch functional group present in the molecule, the C=O group was seen between 1640.0-1796.6 cm-1 and the N=C=S (isothiocyanate) functional group ranged from 2105.9-2206.6 cm -1. The electrical conductivity measurements were obtained by employing a standard process using a programmable LCR meter at a frequency range of 200-100000Hz and the result calculated using the formular σ =L/RA.The electrical conductivity of synthesized dyes were observed to be within the range of 10-5-10-8 S m-1 The electrical conductivity of the dyes and aminothiophene substituted squarylium dyes lies within the range of electrical conductivity for semiconductor which is between 10-12-102 S m-1.