Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， HPLC of Formula: C18H18N4, Which mentioned a new discovery about 16858-01-8
An oxo-bridged dirhenium(III,III) complex of tris(2-pyridylmethyl)amine (tpa) and its one-electron oxidized (III,IV) species, [Re2(mu-O)Cl2(tpa)2]3+,4+ have been prepared. They are new members to a series of rhenium tpa complexes in various oxidation states. X-ray structural determination of the Re2(III,IV) complex revealed practically linear Re-O-Re bridge (178(1)) with short Re-O distances of 1.85(2) A? indicative of some multiple bonded character. The 1H NMR spectrum disclosed the relatively slow rotation around the Re-O-Re axis in CH3CN solution in the timescale of 1H NMR. The complex undergoes two consecutive reversible one electron oxidations Re2(III,III)/(III,IV) and Re2(III,IV)/(IV,IV) at E1/2=0.23 and 0.90 V vs Ag/AgCl, respectively. Strong visible absorption bands are observed for the Re2(III,III) species at 448 (epsilon=31 160) and 563 nm (19 550) which are tentatively assigned to MLCT transitions. A unique oxidation product, Re2(mu-O)(O)2Cl2(bpaO2) 2 (bpaO2H=1,3-bis(2-pyridyl)-2-aza-propanedione) has also been isolated and its crystal structure was determined. The complex is dirhenium(V) species with linear O=Re-O-Re=O moiety. Ligand tpa has been oxidized to ketone with simultaneous dissociation of one of the 2-pyridylmethyl arms.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI