Acentric Extended Solids by Self Assembly of 4,4′-Bipyrazolyls

The Effenberger´s synthesis of 3,3´-bipyrazole revisited

“…1 All of them have been prepared: the family of 3,3'-, 3,5'-and 5,5'-derivatives by many authors, generally with substituents on the carbon atoms, 2-12 the 3,4'-(4,5'-) family less frequently 6,13,14 and, finally, 4,4'-bipyrazoles being again quite common. 6,[15][16][17][18][19][20][21][22] 6 but not its melting point. Finally, some of us prepared again 1 using the Effenberger's procedure, determined its X-ray structure and discussed its tautomerism in solution.…”

Metal‐Anion Coordination and Linker‐Anion Hydrogen Bonding in the Construction of Metal‐Organic Frameworks from Bipyrazole

“…This scenario is observed more frequently when N-based ligands are used as linkers, for the reasons that i) this coordination is based on the lone pairs from a neutral ligand, as in the pyridine case; and ii) the hydrogen atom in the protonated N-H could not be removed in the reaction conditions applied, as in the imidazole case. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Me 4 bpz is highly flexible due to that the two pyrazole rings can rotate around the central C-C bond, and a wide angle of 50°-90° between the two pyrazole rings were observed in the MOFs based on Me 4 bpz. On the other hand, as for the self-assemblies of MOFs, the geometries of organic ligands and inorganic secondary building units (SBUs) [9] are the key factors which determine the topologies of the final structures.…”

Synthesis, crystal structure, thermal stability, and photoluminescence of a 3-D silver(I) network with twofold interpenetrated dia-f topology

“…3,3',5,5'-Tetramethyl-4,4'-bipyrazole (bpz) normally appears as an exo-bidentate ligand, whereby the connected metal centers adopt distances between 9.0 and 10.5 Å [28][29][30][31][32][33][34][35][36][37][38][39][40]. This ligand possesses some flexibility introduced by the free rotation of two pyrazolyl rings around the central C-C bond.…”