Solid-State Hydrogen-Bond Alterations in a [Co2 Fe2 ] Complex with Bifunctional Hydrogen-Bonding Donors.
Masayuki NiheiYuta YanaiDominik NatkeRyo TakayamaMarina KatoYoshihiro SekineFranz RenzH Hiroki OshioPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2019)
A hydrogen-bonding donor-acceptor system, [Co2 Fe2 (bpy*)4 (CN)6 (tp*)2 ](PF6 )2 ⋅2ABA⋅4BN⋅2PE (1 solv ), was prepared by co-crystallization of an external stimuli-responsive cyanide-bridged tetranuclear [Co2 Fe2 ] complex and bifunctional hydrogen-bonding donors, p-aminobenzoic acid. Compound 1 solv exhibited a gradual electron-transfer-coupled spin transition (ETCST), and the removal of solvent molecules led to an abrupt thermal ETCST behavior with increased transition temperature. X-ray structural analysis revealed that the modification of ETCST was caused by a significant alteration of a hydrogen-bonding mode between the tetranuclear [Co2 Fe2 ]2+ cations and ABA molecules. Variable temperature IR measurements indicated that the desolvated form, 1 desolv , showed dynamic alteration of hydrogen-bonding interactions coupled with thermal ETCST behavior. These results suggested that the tetranuclear [Co2 Fe2 ] complex shows solid-state modulations of hydrogen-bond strengths by external stimuli.
Keyphrases
- solid state
- metal organic framework
- electron transfer
- visible light
- transcription factor
- ionic liquid
- highly efficient
- computed tomography
- magnetic resonance imaging
- squamous cell carcinoma
- cancer therapy
- room temperature
- kidney transplantation
- lymph node metastasis
- density functional theory
- quantum dots
- transition metal
- drug delivery
- contrast enhanced