文献类型：期刊文献

英文题名：Plasmonically enhanced Fe(ii) coordination complexes allow SERS readout of spin state switching below the optical diffraction limit

作者：Zhang, Yingrui[1];Lada, Zoi G.[2,6];Aljuhani, Wafaa[1];Lu, Yijun[1];Li, Chunchun[3];Xu, Yikai[4,5];Morgan, Grace G.[6];Bell, Steven E. J.[1]

机构：[1]Queens Univ Belfast, Sch Chem & Chem Engn, Univ Rd, Belfast BT7 1NN, North Ireland;[2]Univ Patras, Dept Chem, Rion 26504, Greece;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[6]Univ Coll Dublin, Sch Chem, Dublin, Ireland

年份：2026

卷号：17

期号：9

起止页码：4814

外文期刊名：CHEMICAL SCIENCE

收录：;EI(收录号：20260319926268);WOS:【SCI-EXPANDED(收录号:WOS:001706211700001)】；

基金：The authors would like to acknowledge the following funding sources: the Science and Technology Commission of Shanghai Municipality Natural Science Foundation of Shanghai (Grant No. 24ZR1416700) (YX); Natural Science Foundation of China 22402060 (YX); Natural Science Foundation of China 22503032 (CL); Department of the Economy (NI.); US-Ireland R&D Partnership Grant USI157 (SB, YZ, and CL); Chinese Scholarship Council 202008370188 (YZ); Science Foundation Ireland (SFI) with a US-Ireland Award 19/US/3631 (GGM) and a Frontiers for the Future Award 19/FFP/6909 (GGM).

语种：英文

外文关键词：Coordination reactions - Core shell nanoparticles - Diffraction - Iron compounds - Metal nanoparticles - Plasmonic nanoparticles - Raman spectroscopy - Spin dynamics

摘要：Creating and monitoring spin crossover (SCO) materials at the nanoscale is challenging since the spin transition phenomena are perturbed and methods for monitoring them are limited. Optical approaches for monitoring nanoscale SCO are attractive but limited by weak signal levels. Here, we demonstrate for the first time that surface enhanced Raman spectroscopy (SERS) allows enhanced readout of spin state transitions of even <1 m SCO nano-objects confined within plasmonic nanovoids. Pressing dry crystalline [Fe(Htrz)(2)(trz)](BF4) (1) into the nanogaps between sheets of metal nanoparticles gave strong SERS signals but was unsuccessful since the surface perturbed the spin transition behaviour. However, when 1 was placed in the plasmonic hotspots between the Au cores in clusters of Au@SCO core-shell nanoparticles, SCO was retained and could be monitored using SERS. Importantly, the clusters showed thermal hysteresis loops which, although narrower than that of bulk 1 (9 K vs. 40 K), demonstrated that cooperative behaviour was retained in the nanovoids.