Synthetic Route of C20H14N4On June 10, 2020, Sharma, Kamna; Gupta, Sandeep K.; Murugavel, Ramaswamy published an article in European Journal of Inorganic Chemistry. The article was 《Discrete and Polymeric Cobalt Pyrophosphates Derived from Pyrophosphoric Acid Diester Ar2H2P2O7》. The article mentions the following:
While the structural elucidation and coordination chem. of organo-monophosphates have been well investigated, research on the simplest member of organo-oligophosphates, viz. diorganopyrophosphates, is relatively rare due to the inherent hydrolytic instability of the ligand. Water elimination from the 2,6-diisopropyl Ph phosphate (dippH2) by the action of dicyclohexylcarbodiimide (DCC) results in the isolation of a diorganopyrophosphates ligand formulated as [O{P(OAr)(OH)(O)}2] (1 or pyrodippH2) (Ar = 2,6-diisopropylphenyl). Due to the instability of 1, it has been transformed into its sodium salt [O{P(OAr)(ONa)(O)}2] (2), which has been used for further reactions to prepare cobalt pyrophosphate complexes 3-7. Reaction of 2 with anhydrous cobalt(II) chloride in the presence of N-heterocyclic ligands results in the formation of [Co(pyrodipp)(imz)3] (3), [Co(pyrodipp)(bpy)2](CH3OH) (4) and [Co(pyrodipp)(phen)2] (5) (imz = imidazole; bpy = 2,2′-bipyridine; phen = 1,10-phenanthroline). Use of multidentate ancillary ligand such as 4-pyridyl-2,2′:6′,2”-terpyridine (pyterpy) under similar reaction conditions leads to the formation of a one-dimensional zig-zag cobalt pyrophosphate coordination polymer [Co(pyrodipp)(pyterpy)(CH3OH)]n (6). In the absence of any ancillary ligand, the reaction between cobalt(II) chloride and 2 in acetonitrile results in the isolation of an interesting inorganic polymer [Co(pyrodipp)(CH3CN)2]n (7), whose backbone consists of a chain of spirocycles of CoP2O3 rings, joined at the cobalt centers. The newly synthesized cobalt pyrophosphates 3-7 have been characterized by both anal. and spectroscopic techniques, magnetic studies apart from single-crystal x-ray diffraction studies in each case. A striking and persistent structural feature in 3-7 is the presence of the cobalt pyrophosphate six-membered metallacycle Co(OPOPO). While cobalt metal exists in trigonal bipyramidal geometry in complex 3, distorted octahedral coordination geometry is observed for cobalt centers in complexes 4-7. In the experimental materials used by the author, we found 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3Synthetic Route of C20H14N4)
4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3) belongs to pyridine derivatives. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals. Synthetic Route of C20H14N4