%0 Generic %A Demadis, Konstantinos D. %A Papadaki, Maria %A Raptis, Raphael G. %A Zhao, Hong %D 2008 %T Corrugated, Sheet-Like Architectures in Layered Alkaline-Earth Metal R,S-Hydroxyphosphonoacetate Frameworks: Applications for Anticorrosion Protection of Metal Surfaces %U https://acs.figshare.com/articles/dataset/Corrugated_Sheet_Like_Architectures_in_Layered_Alkaline_Earth_Metal_i_R_i_i_S_i_Hydroxyphosphonoacetate_Frameworks_Applications_for_Anticorrosion_Protection_of_Metal_Surfaces/2921827 %R 10.1021/cm801004w.s002 %2 https://acs.figshare.com/ndownloader/files/5465348 %K Metal Surfaces Reactions %K ratio %K Ba %K pH 7.3 %K EDS %K XRD %K XRF %K corrosion %K SEM %K Sr %K HPAA %K TGA %X Reactions of M2+ (M = Mg2+ (1), Ca2+ (2), Sr2+ (3), or Ba2+ (4)) salts with R,S-hydroxyphosphonoacetic acid (HPAA) in aqueous solutions of pH 2.0−2.7 at a 1:1 ratio yield hydrated M−HPAA layered or three-dimensional coordination polymers with varying degrees of hydration (metal-coordinated water or lattice water). The crystal structures of 3 (two different phases, 3a and 3b, formed at slightly different pH) and 4 have been determined by single-crystal X-ray crystallography. Both enantiomers (R and S) of HPAA are incorporated in these metal−HPAA materials. Compounds were also characterized by a plethora of other techniques (ATR-IR, SEM, TGA, elemental analyses, powder XRD). Corrosion experiments were carried out at pH 2.0 and 7.3 to study the effect of combinations of externally added Sr2+ or Ba2+ and HPAA (1:1 ratio) on corrosion rates of carbon steel. It was found that at pH 2.0 Sr/HPAA or Ba/HPAA 1:1 combinations are not able to inhibit corrosion. However, at pH 7.3 quantitative corrosion inhibition is achieved. Anticorrosion films were studied by FT-IR, EDS, and XRF. These amorphous (by XRD) inorganic−organic protective coatings are composed of Sr2+ or Ba2+ and HPAA in a 1:1 ratio and are identical to Sr−HPAA or Ba−HPAA materials synthesized at pH 7.3 and different from those synthesized at pH 2.0−2.7. Structure elucidation was not possible because they are amorphous. %I ACS Publications