Terpyridine-Based 3D Metal-Organic-Frameworks: A Structure-Property Correlation.

Design, synthesis, and applications of metal-organic frameworks (MOFs) are among the most salient fields of research in modern inorganic and materials chemistry. As the structure and physical properties of MOFs are mostly dependent on the organic linkers or ligands, the choice of ligand system is of utmost importance in the design of MOFs. One such crucial organic linker/ligand is terpyridine (tpy), which can adopt various coordination modes to generate an enormous number of metal-organic frameworks.

Two- and Three-Dimensional Heterometallic Ln[Ru-α-Ammonium Diphosphonate] Nets: Structures, Porosity, Magnetism, and Proton Conductivity.

By virtue of its magnetic moment and variable valencies, the paddlewheel ruthenium dimer is a desirable molecular building block for the construction of functional networks. If in addition to the Ru open axial site the organic ligand is designed to allow transversal connections, a wider range of structural possibilities is expected. The organic ligand can also be modified to introduce other functionalities.

Metal-Organic Frameworks and Other Crystalline Materials for Ultrahigh Superprotonic Conductivities of 10 S cm or Higher.

Proton-conducting materials in the solid state have received immense attention for their role as electrolytes in proton-exchange membrane fuel cells. Recently, crystalline materials-metal-organic frameworks (MOFs), hydrogen-bonded organic frameworks (HOFs), covalent organic frameworks (COFs), polyoxometalates (POMs), and porous organic crystals-have become an exciting research topic in the field of proton-conducting materials. For a better electrolyte, a high proton conductivity on the order of 10  S cm or higher is preferred as efficient proton transport between the electrodes is ultimately necessary.

Polycarboxylate-Templated Coordination Polymers: Role of Templates for Superprotonic Conductivities of up to 10 S cm.

Three coordination polymers (CPs) have been synthesized based on a [Co(bpy)(H O) ] chain (bpy=4,4'-bipyridine) by a template approach. The frameworks are neutralized by different templated polycarboxylate anions (furan di-carboxylate (fdc) in Co-fdc, benzene tri-carboxylate (btc) in Co-tri and benzene tetra-carboxylate (btec) in Co-tetra). These templates with different degrees of protonation and ionic carrier concentration played significant role on crystal packing as well as formation of well-directed H-bonded networks which made these CPs perform well in proton conduction (PC).

A microporous MOF with a polar pore surface exhibiting excellent selective adsorption of CO from CO-N and CO-CH gas mixtures with high CO loading.

A microporous MOF {[Zn(SDB)(L)]·S} (IITKGP-5) with a polar pore surface has been constructed by the combination of a V-shaped -SO functionalized organic linker (HSDB = 4,4'-sulfonyldibenzoic acid) with an N-rich spacer (L = 2,5-bis(3-pyridyl)-3,4-diaza-2,4-hexadiene), forming a network with sql(2,6L1) topology. IITKGP-5 is characterized by TGA, PXRD and single crystal X-ray diffraction. The framework exhibits lozenge-shaped channels of an approximate size of 4.

A new set of Cd(ii)-coordination polymers with mixed ligands of dicarboxylate and pyridyl substituted diaminotriazine: selective sorption towards CO and cationic dyes.

On the basis of a mixed ligand system of L(NH) (6-(pyridin-4-yl)-1,3,5-triazine-2,4-diamine) and dicarboxylic acids, three new Cd(ii) coordination polymers viz. {[Cd(tdc)(L(NH))(HO)]·DMF·HO} (1), {[Cd(bdc)(L(NH))(HO)]·DMF·HO} (2), and {[Cd(ipa)(L(NH))(DMF)]·HO} (3) (tdcH = thiophene-2,5-dicarboxylic acid, bdcH = benzene-1,4-dicarboxylic acid, ipaH = benzene-1,3-dicarboxylic acid) were synthesized under diverse reaction conditions and characterized by single crystal X-ray diffraction, PXRD, elemental analysis, IR spectroscopy and TGA. While 1 and 2 revealed 1D chain structures, 3 acquired a 2D square net structural arrangement.