Journal
RUSSIAN CHEMICAL BULLETIN
Volume 71, Issue 5, Pages 980-992Publisher
SPRINGER
DOI: 10.1007/s11172-022-3500-8
Keywords
zinc compounds; zinc (1-hydroxyethylidene)diphosphonate; amines; aliphatic amines; (1-hydroxyethylidene)diphosphonic acid; ammonium salts; needle crystals; molecular structures
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Funding
- Institute of Organometallic Chemistry of the Russian Academy of Sciences [RFMEFI62120X0040]
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It has been found that the sparingly soluble zinc (1-hydroxyethylidene)diphosphonate can rapidly dissolve into aqueous solution when exposed to ammonia or aliphatic amines that do not contain hydrophilic groups, forming ammonium derivatives. Among these derivatives, those based on triethylamine, tert-butylamine, or di-n-butylamine have good solubility, while those based on hexamethylenediamine and ammonia have poor solubility.
A suspension of sparingly soluble zinc (1-hydroxyethylidene)diphosphonate ZnH2L center dot 2H(2)O (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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