“…Furthermore, among dyes 4c, 4h and 4i , which have hypsochromic shift relative to 4d , compound 4h shows a small shift. A similar hypsochromic shifts were noticed in azo dyes with chlorine in metaposition [82] , nitro -substituted ( ortho -or para -) [83] and crowding substituents at the phenyl ring [84] . However, it could be concluded that bathochromic or hypsochromic effects caused by the addition of a substituent is highly dependent on the applied solvent [85] .…”