Demadis, Konstantinos D. Papadaki, Maria Raptis, Raphael G. Zhao, Hong Corrugated, Sheet-Like Architectures in Layered Alkaline-Earth Metal <i>R</i>,<i>S</i>-Hydroxyphosphonoacetate Frameworks: Applications for Anticorrosion Protection of Metal Surfaces Reactions of M<sup>2+</sup> (M = Mg<sup>2+</sup> (<b>1</b>), Ca<sup>2+</sup> (<b>2</b>), Sr<sup>2+</sup> (<b>3</b>), or Ba<sup>2+</sup> (<b>4</b>)) salts with <i>R,S</i>-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 <b>3</b> (two different phases, <b>3a</b> and <b>3b</b>, formed at slightly different pH) and <b>4</b> have been determined by single-crystal X-ray crystallography. Both enantiomers (<i>R</i> and <i>S</i>) 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 Sr<sup>2+</sup> or Ba<sup>2+</sup> 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 Sr<sup>2+</sup> or Ba<sup>2+</sup> 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. Metal Surfaces Reactions;ratio;Ba;pH 7.3;EDS;XRD;XRF;corrosion;SEM;Sr;HPAA;TGA 2008-08-12
    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
10.1021/cm801004w.s002