Cobalt Tetrabutano- and Tetrabenzotetraarylporphyrin Complexes: Effect of Substituents on the Electrochemical Properties and Catalytic Activity of Oxygen Reduction Reactions
作者:Lina Ye、Yuanyuan Fang、Zhongping Ou、Songlin Xue、Karl M. Kadish
DOI:10.1021/acs.inorgchem.7b02405
日期:2017.11.6
product. Each porphyrin was also examined as a catalyst for oxygen reduction reactions (ORRs) when adsorbed on a graphite electrode in 1.0 M HClO4. The number of electrons transferred (n) during ORRs is 2.0 for the butano(TpYPP)CoII derivatives, consistent with only H2O2 being produced as a product for the reaction with O2. However, the reduction of O2 using the cobalt benzoporphyrins as catalysts gave n
合成了三系列的四芳基钴卟啉,并通过电化学和光谱电化学对其进行了表征。所研究的化合物具有通式(T p YPP)Co,丁醇(T p YPP)Co II和苯并(T p YPP)Co II,其中T p YPP代表内消旋卟啉的二价阴离子,Y为在四个苯环的对位上的CH 3,H或Cl取代基以及丁酸和苯并分别是在化合物的四个吡咯环上的β-和β'-取代的基团。根据内消旋取代基和所用溶剂的不同,每种卟啉都会经历一两次还原反应。对于(T p在含有0.1M四正丁基高氯酸铵的CH 2 Cl 2中的YPP)Co II和丁烷(T p YPP)Co II;首先导致形成高反应性的钴(I)卟啉,然后它可以与溶剂快速反应,生成Co III CH 2 Cl作为产物。在相同的溶液条件下,苯并(T p YPP)Co II只能看到一个可逆的还原,并且单电子还原产物被指定为钴(II)卟啉π阴离子自由基。对于CH 2 Cl 2中的每种受检
Formation of tetrabenzoporphine skeleton by the reactions of phthalimide with zinc carbonates
The high temperature reactions of phthalimide potassium salt (PIK) with various zinc carbonates were carried out. The reaction of PIK with zinc acetate yielded tetrabenzoporphinato zinc (ZnTBP). Tetra-tert-butyltetrabenzoporphinato zinc (ZntBu4TBP), whose four tert-butyl substituents were positioned on the TBP periphery, was also prepared in a similar way using the 4-tert-butylphthalimide potassium salt (4-tBuPIK). These results were explained on the basis of the function of zinc acetate as the meso-methine carbon source of the TBP structure. The use of zinc phenylacetate instead of zinc acetate in the reaction of PIK led to the production of meso-phenyl substituted ZnTBPs, although they were different in the number of meso-phenyl substituent(s). The attempt to introduce alkyl residues at the meso-position(s) by the reaction of PIK in the presence of zinc alkylacetate having a long alkyl chain was not successful, except for the substitution of the methyl group using zinc propionate.
Electrochemistry of zinc tetraarylporphyrins containing fused butano and benzo groups. Effect of solvent and substituents on spectra, potentials and mechanism in nonaqueous media
作者:Lina Ye、Yuanyuan Fang、Zhongping Ou、Liping Wang、Songlin Xue、Jing Sun、Karl M. Kadish
DOI:10.1142/s1088424618501067
日期:2018.12
text],[Formula: see text]′-pyrrole fused butano or benzo groups were synthesized and characterized as to their electrochemical and spectroelectrochemical properties in nonaqueousmedia. The examined compounds are represented as butano(Ar)4PorZn and benzo(Ar)4PorZn, where Por is the porphyrin dianion and Ar is a [Formula: see text]-CH3Ph, Ph or [Formula: see text]-ClPh substitutent on [Formula: see text]-positions