Metalla-ynes and poly(metallayne)s: synthesis, photophysical properties and opto-electronic applications Rayya Al Balushi Department of Basic Sciences, College of Applied and Health Sciences, A’Sharqiyah University, P.O. Box 42, Ibra 400, Sultanate of Oman Conjugated organometallic poly-ynes have emerged as a new class of materials for opto-electronic (O-E) device applications such as photovoltaics (PVs), light-emitting diodes (LEDs), photo-switch, sensors, and storage devices [1-2] . The presence of a heavy metal like Pt(II) along the polymer backbone imparted large spin-orbit coupling to the poly(metallayne) materials to allow light emission from the triplet excited state. The triplet emission is extremely efficient, approaching 100% efficiency at low temperatures, making the Pt(II) poly-ynes good model systems to study the triplet excited state. The photo-physical properties of these materials can be fine-tuned by judicious variation of the spacer groups, metal, or auxiliary ligands. The presence of a second metal such as Re(I) as a side chain has been found to affect the photophysical properties of the obtained materials [3] . Luminescent Cu(I) complexes have also attracted attention due to their diverse structural and rich photo-physical properties with potential applications in different areas including optoelectronics. Cu(I) is well-known for its ability to form, in association with various types of bridging and terminal ligands, poly-nuclear (cluster) species of various shapes and sizes. Smart variation of ligands and Cu(I) salts has generated different Cu(I) complexes with colorful emissive excited states. Recently, we have developed a facile coordination-driven self-assembly and charge- driven electro-crystallization synthesis for a series of fascinating Cu(I) clusters with a pyridine functionalized ligand, which opened the opportunity to explore the chemistry of these interesting Cu(I) coordination complexes [4] . Synthesis and structure-property relationships in these Pt(II) and Cu(I) materials will be discussed. References 1. Haque, A., Al-Balushi, R. A., Al-Busaidi, I. J., Khan, M. S., & Raithby, P. R. (2018). Rise of conjugated poly-ynes and poly (metalla-ynes): from design through synthesis to structure–property relationships and applications. Chemical reviews , 118 (18), 8474-8597. 2. Al-Balushi, R. A., Haque, A., Al-Busaidi, I. J., Al-Sharji, H., & Khan, M. S. (2021). Heterometal grafted metalla-ynes and poly (Metalla-ynes): A review on structure–property relationships and applications. Polymers , 13 (21), 3654. 3. Haque, A., Al-Balushi, R., Al-Busaidi, I. J., Al-Rasbi, N. K., Al-Bahri, S., Al-Suti, M. K., ... & Raithby, P. R. (2020). Two Is Better than One? Investigating the Effect of Incorporating Re (CO) 3Cl Side Chains into Pt (II) Diynes and Polyynes. Inorganic Chemistry , 60 (2), 745-759. 4. Haque, A., Al Balushi, R. A., Al-Busaidi, I. J., Ilmi, R., Al Rasbi, N., Jayapal, M., ... & Raithby, P. R. (2019). Synthesis, optical spectroscopy, structural, and DFT studies on dimeric iodo-bridged Copper (I) complexes. Journal of Organometallic Chemistry , 892 , 75-82.
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