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Two novel polyoxometalate (POM)-based organic–inorganic hybrids, namely, [(CH 3 ) 2 NH 2 ][Co(tpba)(Mo 2 O 7 )]·2H 2 O ( 1 ) and [(CH 3 ) 2 NH 2 ][Ni(tpba)(Mo 2 O 7 )]·2H 2 O ( 2 ) (tpba = 4-([4,2′:6′,4′′-terpyridin]-4′-yl)benzoic acid), have been synthesized and characterized by elemental analyses, IR spectra, TG analyses and single-crystal X-ray diffraction. Compounds 1 and 2 are isostructural and feature microporous interpenetrated frameworks, which are constructed from metal–organic layers pillared by the [Mo 2 O 7 ] 2 − anions. Topologically, the overall structures of 1 and 2 can be classified as a rare (3,5)-connected twofold interpenetrated hms net, which has never been observed in POM-based hybrid materials prior to this work. Furthermore, the magnetic property of compound 1 are discussed. [ABSTRACT FROM AUTHOR]

Two new isostructural metal-organic frameworks, namely [Co(HL)(bpp)] · 0.5H 2 O (1) and [Zn(HL)(bpp)] · 3H 2 O (2) (H 3 L = 5-(2′-carboxy-biphenyl-4-ylmethoxy)-isophthalic acid, bpp = 1,3-bis(4-pyridyl)propane), have been hydrothermally synthesized and further characterized by single crystal X-ray diffraction, powder X-ray diffraction, elemental analyses, IR spectra and TG analyses. Compounds 1 and 2 exhibit interesting 3D frameworks of (6 5 .8)-CdSO 4 topology with dangling arm (i.e. the uncoordinated 2′-carboxy-biphenyl-4-ylmethoxy group of HL ligand). The remarkable feature of these two compounds is that each dangling arm threads into two 6-membered rings belonging to the 3D net itself, displaying the self-threading character. The magnetic properties of 1 and photoluminescence of 2 have also been investigated. [ABSTRACT FROM AUTHOR]