Recent synthesis of covalent organic assemblies at surfaces has opened up the promise of producing robust nanostructures for functional interfaces. To uncover how this new chemistry works at surfaces and understand the underlying mechanism(s) that control bond breaking and bond making processes at specific positions of the participating molecules, we study here the coupling reaction of tetra(mesityl)porphyrin molecules, which creates covalently connected networks on the Cu(110) surface by utilising the 4 methyl groups as unique connection points. Using scanning tunneling microscopy (STM), state of the art density functional theory (DFT) and Nudged Elastic Band (NEB) calculations, we show that the unique directionality of the covalent bonding is found to stem from a chain of highly selective C H activation and de hydrogenation processes, followed by specific intermolecular C C coupling reactions that are facilitated by the surface, by steric constraints and by anisotropic molecular diffusion.
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But ultimately do I want to improve? Do I want our team to improve? Absolutely. And you know, we do our part. I do my part and this offseason to make sure of that. While there were boxing reasons for Walsh’s comeback, there was also a charitable side to the night: Walsh donated his entire purse to the Norfolk and Norwich University Hospital and Great Ormond Street Hospital, where doctors have treated his young son Liam, who was born with a heart just 20pc of its normal size and has needed a number of operations with another on the horizon. Referee Lee Cook gave his fee and expenses, as did other officials while a pre fight auction raised 1,580. It is anticipated that the final total raised will be around 10,000..
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