Series of Inorganic–Organic Hybrid Materials Constructed From Octamolybdates and Metal–Organic Frameworks: Syntheses, Structures, and Physical Properties

Series of inorganic–organic hybrid materials based on octamolybdates,
silver ions, and multidentate N-donor ligands, namely, [Ag2(2,3′-tmbpt)­(β-Mo8O26)0.5] (1), [Ag2(2,4′-tmbpt)2(α-Mo8O26)0.5(H2O)0.5]·2H2O (2), [Ag3(3,3′-tmbpt)2(α-H2Mo8O26)0.5(β-Mo8O26)0.5]·3.5H2O (3),
[Ag2(3,3′-tmbpt)­(ε-Mo8O26)0.5]·1.75H2O (4), [Ag2(3,4′-tmbpt)2(β-Mo8O26)0.5]·0.5H2O (5),
and [Ag­(3,4′-Htmbpt)­(β-Mo8O26)0.5] (6), where 2,3′-tmbpt = 1-((1H-1,2,4-triazol-1-yl)­methyl)-3-(3-pyridyl)-5-(2-pyridyl)-1,2,4-triazole),
2,4′-tmbpt = 1-((1H-1,2,4-triazol-1-yl)­methyl)-3-(4-pyridyl)-5-(2-pyridyl)-1,2,4-triazole),
3,3′-tmbpt = 1-((1H-1,2,4-triazol-1-yl)­methyl)-3,5-bis­(3-pyridyl)-1,2,4-triazole,
and 3,4′-tmbpt = 1-((1H-1,2,4-triazol-1-yl)­methyl)-3-(4-pyridyl)-5-(3-pyridyl)-1,2,4-triazole)
have been synthesized under hydrothermal conditions. Compound 1 displays a rare 3D (3,4,8)-connected net with (4·82)­(42·84)­(43·820·105) topology. Compound 2 shows
a rare 3D (4,6)-connected self-catenated framework with (64·82)­(42·63·82)­(42·68·84·10)
topology. Compound 3 is a scarce 3D framework based on
two different kinds of [Mo8O26]4– isomers. Compound 4 exhibits a 3D framework constructed
by silver–organic sheets and the rare [ε-Mo8O26]4– anions. Compound 5 shows an interesting 1D → 2D polythreaded structure. Compound 6 displays a 2D layer structure, which is further linked by
the N–H···O hydrogen bonds to form a 3D supramolecular
architecture. Their structures have been further characterized by
infrared spectra (IR), elemental analyses, powder X-ray diffraction
(PXRD), electrochemistry and photoluminesce. Moreover, the photocatalytic
activities for degradation of organic pollutant have been investigated
for compounds 3–6.