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Decomposition of zinc (1-hydroxyethylidene)diphosphonate induced by aliphatic amines and ammonia. Molecular structures of ammonium (1-hydroxyethylidene)diphosphonates |
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| Authors: | Semenov V V Zolotareva N V Novikova O V Petrov B I Lazarev N M Fukin G K Cherkasov A V Razov E N |
| Institution: | 1.G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 ul. Tropinina, 603950, Nizhny Novgorod, Russian Federation ;2.Lobachevsky State University of Nizhny Novgorod, 23 prosp. Gagarina, 603022, Nizhny Novgorod, Russian Federation ;3.Mechanical Engineering Research Institute, Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences, 85 ul. Belinskogo, 603024, Nizhny Novgorod, Russian Federation ; |
| Abstract: | A suspension of sparingly soluble zinc (1-hydroxyethylidene)diphosphonate ZnH2L?2H2O (H4L = MeC(OH)P(O)(OH)2]2) is rapidly transformed into an aqueous solution when treated with ammonia or aliphatic amines (hexamethylenediamine, triethylamine, tert-butylamine, di-n-butylamine) containing no hydrophilic groups ?OH and ?(OCH2CH2)n?. The dissolution effect is due to the decomposition of the coordination polymer giving ammonium derivatives. Dehydrated dry powders of the corresponding ammonium compounds based on triethylamine, tert-butylamine, or di-n-butylamine rapidly dissolve in water to form transparent colorless solutions, whereas hexamethylenediamine and ammonia derivatives are poorly soluble. (1-Hydroxyethylidene)diphosphonic acid forms ammonium salts with hexamethylenediamine, triethylamine, and tert-butylamine. The molecular structures of these compounds are considered. |
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