Synthesis, structure, and properties of nitrilo-tris(methylenephosphonato)-triaquairon(II) {Fe[µ-NH(CH2PO3H)3](H2O)3}, as an ingredient of anticorrosive protective coatings on the steel surface

Zinc and Cadmium Nitrilotris(methylenephosphonate)s: A Comparative Study of Different Coordination Structures for Corrosion Inhibition of Steels in Neutral Aqueous Media

“…FeNTP is then isolated and its structure is characterized in detail by the single-crystal XRD (CCDC 1035265). [19] The interaction of soluble NTP complexes of Zn or Cd with Fe 2 + ions has been previously shown [20]…”

“…The inhibition activity of NTP arises from its reaction with Fe 2+ ions followed by the formation of an anti‐corrosion film of sparingly soluble linear organic‐inorganic coordination polymer [Fe(H 2 O) 3 μ‐{NH(CH 2 PO 3 H) 3 }] n ( FeNTP ) on steel surface. FeNTP is then isolated and its structure is characterized in detail by the single‐crystal XRD (CCDC 1035265) [19] …”

“…The resulting Fe 1/2 Zn 1/2 NTP and Fe 7/8 Cd 1/8 NTP compounds have been isolated and thoroughly characterized [20] . The single‐crystal XRD analysis has shown that the mentioned compounds have the crystal structure (CCDC 1849911 and 1850041) [20] which is isostructural with FeNTP [19] . Doping the FeNTP polymer structure with the Cd 2+ ions has been shown to cause the spin‐crossover of the Fe atoms from the high‐spin state 5 D(3 s 2 3 p 6 3 d ↑ 5 ↓ 1 ) to the low‐spin state 1 S(3 s 2 3 p 6 3 d ↑ 3 ↓ 3 ).…”

3d‐metal (Cr to Zn) Nitrilotris(Methylenephosphonate)s with different coordination symmetries: Electronic Structure and Chemical Bond

“…Complexes with chelating and bridging structure, coordination polymers, and H 6 L-based MOF were obtained. These compounds have many valuable functional properties and may be used as corrosion inhibitors, [8][9][10][11][12] protective anticorrosion coatings, [13][14][15] scaling inhibitors, [16,17] proton conductors and phosphors. [18] Some metal-phosphonate complexes exhibit fascinating and practically important photoelectric properties.…”

“…Complexes [Mn II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Mn) [37,38] and [Zn II-(H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Zn) [37,39] used as corrosion inhibitor have been earlier obtained by the interaction of the respective Mn 2 + /Zn 2 + ions with H 6 L, structurally characterized and described. Complexes [Cu II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Cu), [40] [Cr II-(H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Cr), [41] [Co II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Co), [42] [Fe II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Fe), [43] [44] have been recently synthesized by the authors and their structures have been described in detail elsewhere. [37][38][39][40][41][42][43][44] Despite difficulties in preparing I-Cr and I-Fe caused by their extremely low solubility, single-crystals of these complexes have been obtained using the method of crystal growth in gel.…”