Profound Substituent Effect on the Structural, Optical, Photophysical, and Electrochemical Properties of <i>N</i>,<i>N</i>′‑Anthraquinone Diimine-Containing Platinum–Organometallic Polymers

A series of conjugated organometallic-substituted derivatives of anthraquinone diimine-(trans-diethynylbis­(tri-n-butylphosphine)­platinum­(II)-containing polymers along with the corresponding mixed-valence analogues bis­(4-phenylamino)­anthracene and anthraquinone diimine and model compounds (substituent = H, Br, 2Br, NH2, 2NH2) were investigated by electrochemistry, UV–visible and emission spectroscopy, photophysics, and DFT and TDDFT computations, as a means to shine light on the electronic communication across the chain of the seemingly unconjugated polyaniline in its emeraldine form and to examine the substituent effect.