A multitechnique investigation of an evaporable vanadyl spin system with long-lived quantum coherence that self-assembles on gold.

We present a spectroscopic and magnetic (both static and dynamic) characterization of two isostructural Dy and Er complexes evidencing that, despite the different types of magnetic anisotropy, the two molecules show similar slow relaxation of the magnetization in a static magnetic field.

Vanadium(iv) complexes have recently shown record quantum spin coherence times that in several circumstances are limited by spin-lattice relaxation. The role of the environment and vibronic properties in the low temperature dynamics is here investigated by a comparative study of the magnetization dynamics as a function of crystallite size and the steric hindrance of the β-diketonate ligands in VO(acac) (1), VO(dpm) (2) and VO(dbm) (3) evaporable complexes (acac = acetylacetonate, dpm = dipivaloylmethanate, and dbm = dibenzoylmethanate). A pronounced crystallite size dependence of the relaxation time is observed at unusually high temperatures (up to 40 K), which is associated with a giant spin-phonon bottleneck effect. We model this behaviour by an ad hoc force field approach derived from density functional theory calculations, which evidences a correlation of the intensity of the phenomenon with ligand dimensions and the unit cell size.