The author of 《Hydrophilic quaternary ammonium-group-containing [FeFe]H2ase models prepared by quaternization of the pyridyl N atoms in pyridylazadiphosphine- and pyridylmethylazadiphosphine-bridged diiron complexes with various electrophiles》 were Song, Li-Cheng; Feng, Li; Guo, Yuan-Qiang. And the article was published in Dalton Transactions in 2019. Recommanded Product: 4-Bromobutanoic acid The author mentioned the following in the article:
The first aromatic quaternary ammonium-group-containing [FeFe]H2ase models have been prepared by a simple and convenient two-step method in high yields. Thus, on the basis of preparation of the N-pyridylazadiphosphine-bridged diiron complex (μ-PDT)Fe2(CO)4[μ-3-(Ph2P)2NC5H4N] (A) by CO substitution of parent complex (μ-PDT)Fe2(CO)6 with N-pyridylazadiphosphine 3-(Ph2P)2NC5H4N in refluxing xylene, further quaternization of the pyridyl N atom in complex A with electrophile 1,3-propanesultone, 1,3,2-dioxathiolane-2,2-dioxide, or 4-bromobutyric acid in refluxing MeCN afforded the pyridyl quaternary ammonium-group-containing models (μ-PDT)Fe2(CO)4[μ-3-(Ph2P)2NC5H4NR] (1, R = (CH2)3SO3; 2, R = (CH2)2OSO3) and (μ-PDT)Fe2(CO)4[μ-3-(Ph2P)2NC5H4N(CH2)3CO2H]Br (3). Similarly, the N-pyridylmethylazadiphosphine-bridged diiron complex (μ-PDT)Fe2(CO)4[μ-3-(Ph2P)2NCH2C5H4N] (B) could be prepared by CO substitution of parent complex (μ-PDT)Fe2(CO)6 with N-pyridylmethylazadiphosphine 3-(Ph2P)2NCH2C5H4N in refluxing xylene, while further quaternization of the pyridylmethyl N atom in complex B with 1,3-propanesultone and 3-bromo-1-propanol in MeCN at reflux gave the pyridylmethyl quaternary ammonium-group-containing models (μ-PDT)Fe2(CO)4[μ-3-(Ph2P)2NCH2C5H4N(CH2)3SO3] (4) and (μ-PDT)Fe2(CO)4[μ-3-(Ph2P)2NCH2C5H4N(CH2)3OH]Br (5), resp. All new complexes A, B, and 1-5 were characterized by elemental anal. and various spectroscopies, while the mol. structures of complexes A, B, 2 and 5 were further confirmed by x-ray crystallog. The electrochem. study on hydrophilic models 1 and 3 in MeCN and the MeCN/H2O mixed solvent indicated that the reduction potentials were shifted to less-neg. potentials as the water content increased; such an observation implies that both 1 and 3 are easily reduced in the mixed MeCN/H2O solvent than in MeCN. In addition, the electrocatalytic study demonstrated that both 1 and 3 can serve as electrocatalysts for H2 production from acetic acid with higher icat/ip and TONs in MeCN/H2O than in MeCN. In the experiment, the researchers used 4-Bromobutanoic acid(cas: 2623-87-2Recommanded Product: 4-Bromobutanoic acid)
4-Bromobutanoic acid(cas: 2623-87-2) belongs to carboxylic acids. The chief chemical characteristic of the carboxylic acids is their acidity. They are generally more acidic than other organic compounds containing hydroxyl groups but are generally weaker than the familiar mineral acids (e.g., hydrochloric acid, HCl, sulfuric acid, H2SO4, etc.).Recommanded Product: 4-Bromobutanoic acid
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary