Entanglement of spin transition and structural adaptability: manipulating the slow spin equilibrium by the guest-mediated fine-tuning of elastic frustration.

A comprehensive analysis of physical and chemical properties using the same family of spin-crossover complexes is crucial for understanding and designing structure-property relationships. However, finding an appropriate system remains challenging. Here, a series of guest-saturated states based on the 2D Hofmann-type framework [Fe(prentrz)Pd(CN)]·guest (prentrz = (1,2)-3-phenyl--(4-1,2,4-triazol-4-yl)prop-2-en-1-imine; 1·guest) is reported, exhibiting a guest-manipulated slow dynamic effect on spin equilibrium in an incomplete two-step spin-crossover (SCO) process.