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Nanocap‐Shaped Tin Phthalocyanines: Synthesis, Characterization, and Corrosion Inhibition Activity
Author(s) -
Beltrán Hiram I.,
Esquivel Raquel,
LozadaCassou Marcelo,
DominguezAguilar Marco A.,
SosaSánchez Arturo,
SosaSánchez Jose L.,
Höpfl Herbert,
Barba Victor,
LunaGarcía Rolando,
Farfán Norberto,
ZamudioRivera Luis S.
Publication year - 2005
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400955
Subject(s) - tin , tafel equation , corrosion , elemental analysis , brine , electrochemistry , chemistry , nuclear chemistry , inorganic chemistry , materials science , organic chemistry , electrode
Abstract Thermal and microwave reactions between [PcSn IV Cl 2 ] ( 1 ) and the potassium salts of eight fatty acids ( 2 a – h ) led to cis ‐[(RCO 2 ) 2 Sn 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 π‐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.