A novel AB3-type trimeric zinc(ii)-phthalocyanine as an electrochromic and optical limiting material. Issue 40 (22nd September 2020)

• Record Type: Journal Article
• Authors: Işık Büyükekşi, Sebile; Karatay, Ahmet; Orman, Efe Baturhan; Açar Selçuki, Nursel; Özkaya, Ali Rıza; Salih, Bekir; Elmali, Ayhan; Şengül, Abdurrahman
• Is Part Of: Dalton transactions. Volume 49:Issue 40(2020)
• Page Start: 14068
• Page End: 14080
• Publication Date: 2020-09-22
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt02460k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A novel asymmetric AB3 -type trinuclear zinc(ii )-phthalocyanine is reported, showing good electrochromic and optical limiting properties. Abstract : Recent advances in the practical applications of metallophthalocyanines (MPcs) in different technological fields have stimulated us to design and synthesize a new asymmetric AB3 -type trimeric zinc(ii )-phthalocyanine (1 ). This bulky and high molecular weight compound was characterized by elemental analysis, 1 H, 13 C DEPT, and 1 H- 1 H NOESY NMR, HR MALDI-TOF mass spectrometry, UV-vis, and FT-IR (ATR) techniques. In-depth electrochemical studies show that 1 displays quasi-reversible three one-electron reductions and two one- or two-electron oxidation processes, rather than any redox processes including the transfer of three-electrons in one-step. Besides this, in situ spectroelectrochemical measurements suggest the good application potential of 1 as an electrochromic material in display technologies. A study of the nonlinear optical properties (NLOs) of 1 reveals that the poly(methylmethacrylate) (PMMA) composite film displays a much larger nonlinear absorption coefficient and a lower saturable absorption threshold for optical limiting when compared to the same Pc molecules in solution. Ultrafast transient absorption measurements reveal the intersystem crossing mechanism. Density functional theory (DFT) was used for the geometry optimizations and time dependent-DFT (TD-DFT) for HOMO/LUMO energies and electronic transitions for 1 .