Maintenance notice in PDT time zone (7:50 PM June 12 - 12:30 AM June 13, 2026): Our website is scheduled to be unavailable due to maintenance. We appreciate your patience and understanding.
Sign up for free shipping on all website orders, no minimum required, and get exclusive coupons!
Users can now ask questions to the AI chatbot by clicking the chatbot icon in the bottom-right corner of the website.
![9,9'-Spirobi[9H-9-silafluorene]](/medias/S0983.jpg?context=bWFzdGVyfHJvb3R8NTQxMjB8aW1hZ2UvanBlZ3xhRFk1TDJoa1l5ODRPVE15TWpZMU1qazFPVEF5TDFNd09UZ3pMbXB3Wnd8NzMwODNlODcwMWFmN2ZkZjRiYzk2OWRlMWEyN2E2MDQ0NDFkNGFmMzEzZTdhM2Y1M2VhOTJhMTQ0NDg2NjNkYw "9,9'-Spirobi[9H-9-silafluorene]")
![[5,15-Bis(phenylethynyl)-10,20-bis[(triisopropylsilyl)ethynyl]porphyrinato]magnesium(II)](/medias/B4314.jpg?context=bWFzdGVyfHJvb3R8NDQxMzh8aW1hZ2UvanBlZ3xhR0ZrTDJoaU55ODRPVEk1TURRME16azRNVEV3TDBJME16RTBMbXB3Wnd8ZjY0NTg1MTNjNmI5NjM1ZDExMDhkYzhlZjg3Nzg0YWYzYTMwZTg1ZWRmOGZiYTQ4OTdmZDliYWEzMmRhMDkyOQ "[5,15-Bis(phenylethynyl)-10,20-bis[(triisopropylsilyl)ethynyl]porphyrinato]magnesium(II)")