Four novel isopolymolybdate-based
coordination polymers (CPs),
constructed from 2,6-bis(1,2,4-triazol-1-yl)pyridine (btp), 1,3-bis(4H-1,2,4-triazol-4-yl)benzene (btb), and 3,5-bis(1-imidazolium)pyridine
(bip), have been synthesized under a hydrothermal method: {[Co(btp)(H2O)2(β-Mo8O26)0.5]·3H2O}
n
(1), [Ni(btp)(H4Mo6O22)0.5]
n
(2), [Co(btb)(H2O)(β-Mo8O26)0.5]
n
(3), and {[Co(Hbip)2(H2O)2(γ-Mo8O26)]·6H2O}
n
(4). Complex 1 exhibits one 3D framework with an unexpected 3-nodal 2,4,6-c
net topology containing the 1D {β-Mo8O26}
n
chains, 6-connected CoII centers, and V-type coordinated btp ligands. The neighboring [Mo6O22]4– anions of complex 2 are bridged by the NiII centers to build one
2D {Ni2(Mo6O22)} network, which is
arranged into the 3D framework through the weak π···π
stacking interactions. In compound 3, one 3D framework
is formed by the adjacent 1D {Co2(btp)2}
n
chains connected by {β-Mo8O26}
n
units, which demonstrates
a rare 4,6-c fsc topology. In complex 4, one 2D {Co(Hbip)2(γ-Mo8O26)} layer with a (4, 4)
network is connected to one 3D hydrogen-bonding framework via N-H···O and O-H···O hydrogen
bonds. Magnetic data indicate that complexes 1 and 4 exhibit antiferromagnetic behaviors, whereas complexes 2 and 3 reveal spin-canting magnetic behavior
and metamagnetic behavior, respectively. In addition, the proton conductivity
of complexes 3 and 4 was investigated, showing
that compound 4 has good proton conductivity at 85 °C
and a relative humidity of 98% RH.
