Evolution of cooperativity in the spin transition of an iron(II) complex on a graphite surface.

ABSTRACT: Cooperative effects determine the spin-state bistability of spin-crossover molecules (SCMs). Herein, the ultimate scale limit at which cooperative spin switching becomes effective is investigated in a complex [Fe(H₂B(pz)₂)₂(bipy)] deposited on a highly oriented pyrolytic graphite surface, using x-ray absorption spectroscopy. This system exhibits a complete thermal- and light-induced spin transition at thicknesses ranging from submonolayers to multilayers. On increasing the coverage from 0.35(4) to 10(1) monolayers, the width of the temperature-induced spin transition curve narrows significantly, evidencing the buildup of cooperative effects. While the molecules at the submonolayers exhibit an apparent anticooperative behavior, the multilayers starting from

SUBMITTER: Kipgen L 

PROVIDER: S-EPMC6065309 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature