title: Nanocap-shaped tin phthalocyanines: synthesis, characterization, and corrosion inhibition activity.
abstract: Thermal and microwave reactions between [PcSn(IV)Cl2] (1) and the potassium salts of eight fatty acids (2 a-h) led to cis-[(RCO2)2Sn(IV)Pc] compounds (3 a-h) in yields ranging from 54 to 90 %. Compounds 3 a-h were fully characterized by elemental analysis, spectroscopy (IR, UV/Vis, multinuclear NMR), and seven X-ray diffraction structures, whereby two different allotropes were observed in two cases. The two carboxylates in 3 have a cis anisobidentate binding mode, octacoordination of the tin atoms with square-antiprismatic geometry, and pi-electron-rich nanocap shapes. On account of the latter characteristics, 3 a-h compounds have anticorrosion properties. LPR and Tafel electrochemical methods were used to characterize the behavior of these derivatives in naturally aerated sour brine, which is a common environment in petroleum production and refinery operations. The measurement of the corrosion rate of carbon steel AISI 1018 in the presence of 3 a-h (500 ppm) gave efficiencies of 61-87 % for the inhibitor performance. Of the different derivatives examined, compounds 3 e and 3 h were the most effective corrosion inhibitor prototypes.
authors.affiliation: PIM-IMP, Eje Central Lázaro Cárdenas 152, Col. San Bartolo Atepehuacan, C. P. 07730 Mexico D. F., Mexico. hbeltran@imp.mx
authors.forename: Hiram I
authors.initials: HI
authors.lastname: Beltrán
authors.forename: Raquel
authors.initials: R
authors.lastname: Esquivel
authors.forename: Marcelo
authors.initials: M
authors.lastname: Lozada-Cassou
authors.forename: Marco A
authors.initials: MA
authors.lastname: Dominguez-Aguilar
authors.forename: Arturo
authors.initials: A
authors.lastname: Sosa-Sánchez
authors.forename: Jose L
authors.initials: JL
authors.lastname: Sosa-Sánchez
authors.forename: Herbert
authors.initials: H
authors.lastname: Höpfl
authors.forename: Victor
authors.initials: V
authors.lastname: Barba
authors.forename: Rolando
authors.initials: R
authors.lastname: Luna-García
authors.forename: Norberto
authors.initials: N
authors.lastname: Farfán
authors.forename: Luis S
authors.initials: LS
authors.lastname: Zamudio-Rivera