Using polynuclear metal clusters as nodes, many high-symmetry high-connectivity nets, like 8-connnected bcu and 12-connected fcu, have been attained in metal-organic frameworks (MOFs). However, construction of low-symmetry high-connected MOFs with a novel topology still remains a big challenge. For example, a uninodal 8-connected lsz network, observed in inorganic ZrSiO, has not been topologically identified in MOFs. Using 2,2'-difluorobiphenyl-4,4'-dicarboxylic acid (HL) as a new linker and 1,2,4-triazole (Htrz) as a coligand, a novel three-dimensional Cd-MOF, namely poly[tetrakis(μ-2,2'-difluorobiphenyl-4,4'-dicarboxylato-κO,O:O:O:O)tetrakis(N,N-dimethylformamide-κO)tetrakis(μ-1,2,4-triazolato-κN:N:N)hexacadmium(II)], [Cd(CHFO)(CHN)(CHNO)], (I), has been prepared. Single-crystal structure analysis indicates that six different Cd ions co-exist in (I) and each Cd ion displays a distorted [CdON] octahedral geometry with four equatorial O atoms and two axial N atoms. Three Cd ions are connected by four carboxylate groups and four trz ligands to form a linear trinuclear [Cd(COO)(trz)] cluster, as do the other three Cd ions. Two Cd clusters are linked by trz ligands in a μ-bridging mode to produce a two-dimensional Cd-triazolate layer with (6,3) topology in the ab plane. These two-dimensional layers are further pillared by the L ligands along the c axis to generate a complicated three-dimensional framework. Topologically, regarding the Cd cluster as an 8-connected node, the whole architecture of (I) is a uninodal 8-connected lsz framework with the Schläfli symbol (4·6). Complex (I) was further characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction, thermogravimetric analysis and a photoluminescence study. MOF (I) has a high thermal and water stability.
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