Presentation Information
[2H02]On-surface syntheses of spin-1/2 molecular quntum chains and rings
*Shigeki Kawai1 (1. National Institute for Materials Science)
Here, we realized the entangled antiferromagnetic quantum spin-1/2 Heisenberg model chains and rings with diazahexabenzocoronene and air-stable phenalenyl derivatives on Au(111), respectively[1,2]. Their structures as well as the electronic and magnetic properties were in depth investigated with a combination of scanning tunnelling microscopy/scanning tunnelling spectroscopy at 4.3 K and comprehensive theoretical simulations. For the chain, we found that a given antiferromagnetic coupling J value between first neighbors in the entangled quantum states is responsible for the quantum phenomena, strongly relating to their parities of the chain. For the rings, we found that while large magnetic exchange interactions exist in both cyclic pentamer and hexamer, the pentamer features an increased geometric frustration of the system. Our findings may offer a powerful approach for constructing spin-frustrated molecular architectures, allowing precise control over quantum magnetic interactions.Reference: [1] K. Sun, et al., Science Advances 2025, 11, eads1641. [2] D. Li, et al., J. Am. Chem. Soc. 2025, 147, 26208.