Aminoalkyl‐1,1‐bis(phosphinic acids): Stability, Acid–Base, and Coordination Properties

Autor:	Jan Kotek, Petr Hermann, Ivan Lukeš, Soňa Procházková, Tomáš David, Vojtěch Kubíček
Rok vydání:	2014
Předmět:	Inorganic Chemistry Trigonal bipyramidal molecular geometry Crystallography Coordination sphere Denticity Geminal Octahedron Stereochemistry Chemistry Chelation Amine gas treating Nuclear magnetic resonance spectroscopy
Zdroj:	European Journal of Inorganic Chemistry. 2014:4357-4368
ISSN:	1099-0682 1434-1948
Popis:	Four geminal bis(phosphinic acids), namely, aminomethylbis(H-phosphinic acid) (H2L1) and 4-aminobutyl-1-hydroxy-1,1-bis(R-phosphinic acid) with R = H (H2L2), Me (H2L3) and CH2CH2COOH (H4L4), were studied. Their acid–base properties and coordination ability towards Cu2+, Ni2+ and Zn2+ ions were studied by potentiometry, UV/Vis spectroscopy and NMR spectroscopy. The amine group in H2L1 has a lower protonation constant (log Ka = 6.79) than those found for other studied bisphosphinates (log Ka = 10.75–11.05) with distant amine groups. The structure of [Ca(H2L2-O,O′)(HL2-O,O′)]Cl revealed an octahedral arrangement of the metal coordination sphere and a linear polymeric structure, which forms through eight-membered Ca(–O–P–O–)2Ca rings. The structure of [Cu(HL3-O,O′)2(H2O)]·5H2O shows two chelating bisphosphinate groups in an equatorial O4 environment. The structure of [Cu(H0.5L3-O,O′)(NO3)0.5]·2.25H2O shows two different coordination environments, one is an elongated tetragonal pyramid, and the other is a trigonal bipyramid with a bidentate nitrate ion.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1a5d76517d4bb01a8e50084f4383cf95 https://doi.org/10.1002/ejic.201402420 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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