title: Spin crossover by encapsulation.
abstract: Encapsulation by synthetic hosts can transform the spin states of square planar Ni(II)(acen) and Co(II)(tap) complexes. Upon encapsulation, the red Ni(II) diamagnetic state was converted into a green paramagnetic state, whereas the Co(II) low spin (S = 1/2) state was changed into a coupled (S = 1/2 and S = 3/2) state. The host cages are noninnocent and host-guest interactions within the confined cavity influence the resultant properties of the enclathrated metal complexes.
authors.affiliation: Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Ono
authors.forename: Michito
authors.initials: M
authors.lastname: Yoshizawa
authors.forename: Munetaka
authors.initials: M
authors.lastname: Akita
authors.forename: Tatsuhisa
authors.initials: T
authors.lastname: Kato
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Tsunobuchi
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Ohkoshi
authors.forename: Makoto
authors.initials: M
authors.lastname: Fujita