title: Solvent effects on the structures and magnetic properties of two doubly interpenetrated metal-organic frameworks.
abstract: Two doubly interpenetrated coordination polymers [Co2(BDC)2(bpt)2]·nSolvent based on dimeric secondary building units and crystallizing with distinct solvent molecules (-H2O and -MeOH for nSolvent = 2H2O and MeOH·H2O, respectively) were obtained by employing 1,4-benzenedicarboxylate (BDC) and 1H-3,5-bis(4-pyridyl)-1,2,4-triazole) (bpt) as linkers. The structures consist of a square grid of dimers bridged by BDC and pillared by bpt. Thermogravimetry and PXRD indicate that the frameworks are stable and are retained up to 400 °C, but the structures are modified irreversibly. -H2O, high-symmetry Pna21, exhibits antiferromagnetic coupling within the dimer, while -MeOH, low-symmetry P21/n, exhibits ferromagnetic coupling. Upon desolvation, the -de and -de couplings are antiferromagnetic but reduced. Subsequent resolvation to -H2O and -MeOH resulted in a slight increase of the antiferromagnetic coupling without attaining the virgin states. The interesting difference of magnetic properties between -H2O and -MeOH, the solvated/desolvated phases, particularly at low temperature, indicates that there is a prominent solvent effect.
authors.affiliation: Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmacy, Guangxi Normal University, Guilin 541004, P. R. China. huangfp2010@163.com.
authors.forename: Fu-Ping
authors.initials: FP
authors.lastname: Huang
authors.forename: Cheng
authors.initials: C
authors.lastname: Yang
authors.forename: Hai-Ye
authors.initials: HY
authors.lastname: Li
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Yao
authors.forename: Xiao-Huan
authors.initials: XH
authors.lastname: Qin
authors.forename: Shi-Ping
authors.initials: SP
authors.lastname: Yan
authors.forename: Mohamedally
authors.initials: M
authors.lastname: Kurmoo
mesh_terms: D060328:Magnetic Phenomena; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry
chemical_list: D009942:Organometallic Compounds; D012997:Solvents; D014230:Triazoles; C045575:1,2,4-triazole