title: Tuning the spin-crossover behaviour of a hydrogen-accepting porous coordination polymer by hydrogen-donating guests.
abstract: A Hoffman-like coordination polymer with appreciable porosity and uncoordinated pyridyl groups, namely, [Fe(2,5-bpp){Au(CN)2}2]⋅x Solv (2,5-bpp = 2,5-bis(pyrid-4-yl)pyridine; Solv = solvent), was synthesised and characterised. A series of fascinating spin-crossover behaviours with abrupt, stepwise and hysteretic features were obtained by exchange with a range of protic solvents (ethanol, n-propanol, isopropyl alcohol, sec-butanol and isobutanol). Guest-host hydrogen-bonding interactions involving the H-accepting site of the framework are primarily responsible for the pronounced cooperativity of these spin-crossover behaviours. Meanwhile, the tunable critical temperatures over a range of about 130 K are presumably attributable to a certain degree of competition between internal pressure and local electronic influences of solvents.
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry & Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275 (P.R. China).
authors.forename: Jin-Yan
authors.initials: JY
authors.lastname: Li
authors.forename: Yan-Cong
authors.initials: YC
authors.lastname: Chen
authors.forename: Ze-Min
authors.initials: ZM
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Zhao-Ping
authors.initials: ZP
authors.lastname: Ni
authors.forename: Ming-Liang
authors.initials: ML
authors.lastname: Tong
keywords: coordination polymers; host-guest systems; iron; magnetic properties; spin crossover