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We provide a physically meaningful picture of the nature of the ground stateof the Cr8Ni compound in the regime where it is a spin singlet. According tothis picture, the anisotropy of the $Ni$ atom in the $Cr$ ring induces adimerization in the molecule that makes the ground state to stabilize in aValence Bond Solid phase of virtual spins. We characterize rigorously thisphase by means of a particular non-local order parameter denoted thegeneralized string order parameter. In the completely antiferromagnetic regime,the system becomes frustrated. We have performed a numerical real-timeevolution study of the correlations between the spin of the $Ni$ impurity andthe rest of the spins in order to show the reaction of the system under thisfrustration. We provide results that manifestly show the agreement with theValence Bond Solid picture introduced.

VBS State Induced by Impurity Frustration in Cr8Ni