Abstract
Purpose - To discuss synthesis and evaluation of organo-metallic dyes as second-order nonlinear optical (SONLO) material.Design methodology approach - New dyes have been synthesised via Knovoenagel reactions of ferrocene carboxyaldehyde and two active methylene compounds.Findings - The ferrocenyl dyes prepared have shown bathochromic shift and thermal stability.Practical implications - These compounds have UV-Vis bathochromic shift, enabling them to be used as SONLO materials as well as dyes.Originality value - The paper provides further information on the thermal studies of these types of molecules.