Polyol‐Metall‐Komplexe. 18. Mehrkernige Cuprate(II) mit deprotoniertem Glycerin als Ligands

Abstract

Na3[Cu3(GlycH−3)3] · 7 H2O (1) and Na3[Cu3(GlycH−3)] · 1/3 NaNO3 · 10 H2O (4) (Glyc = Glycerin) kristallisieren aus wäßrig‐alkalischer Lösung. Die dreikernigen Tricuprat(II)‐Ionen sind (bei 1 angenähert) Cs‐symmetrisch, der zentrale Cu3O3‐Ring liegt in einer Briefumschlagkonformation mit einem Kupferatom als weggeklappter Ecke vor. Ba2(ox)[Cu2(μ‐OH)2(Glycl, 2 H−2)2] · 10 H2O (2) (ox = Oxalat) entsteht durch Luftoxidation aus entsprechenden Lösungen mit Bariumhydroxid.

Glycerol as Ligand: The Synthesis, Crystal Structure, and Properties of Compounds [Ln2(H2L)2(H3L)4][Re6Q8(CN)6], Ln = La, Nd, Gd, Q = S, Se

“…Scheme 2 presents the coordination modes of glycerol and glycerolate anions (H 2 L -, HL 2-, and L 3-) in structurally characterized complexes of transition metals. [13] b) chelating coordination of HL 2-; [14][15][16][17] c) chelating/bridging coordination of HL 2-; [18,19] d) chelating/bridging coordination of L 3-. [17,20] There is only one crystal structure in which glycerol ex-…”

“…These coordination modes were encountered in numerous complexes of transition metals, e.g. CoHL, [18] ZnHL, [19] [17] www.eurjic.org…”

“…The chelating coordination of HL 2-(Scheme 2b) has been reported for several molecular complexes of platinum, [14,15] vanadium, [16] and copper. [17] The glycerolate anions HL 2-and L 3-often served as both chelating and bridging ligands (Scheme 2c and d). These coordination modes were encountered in numerous complexes of transition metals, e.g.…”

Tin and Lead Alkoxides of Ethylene Glycol and Glycerol and their Decomposition to Oxide Materials

“…Triple‐deprotonated glycerolate ligands were found in the trinuclear complex [Cu 3 (C 3 H 5 O 3 ) 3 ] 3– in lithium‐copper(II) and sodium‐copper(II) glycerolates. While these copper glycerolates were precipitated from highly alkaline solutions,, Sn 5 (C 3 H 5 O 3 ) 4 forms without a strong base in the reaction mixture. Similar to the reaction of Sn(C 2 O 4 ) with EG, the deprotonation of glycerol (p K a1 = 14.15) might be facilitated by large differences in the involved complex formation constants and/or the solubility products.…”

Copper(II) and Palladium(II) Complexes of the Reducing Sugar Lyxose

“…Neither simple monometallated species of the kind [(N‐ligand) m Cu( D ‐LyxH −2 )] nor bimetallated complexes of the type [(N‐ligand) n Cu 2 ( D ‐LyxH −4 )] have been isolated despite the use of suitable molar ratios. One of the reasons for the formation of the more complicated structures of 1 and 2 is the higher stability of polyolato over am(m)ine complexes in solutions of sufficiently high pH, as has been shown for simple diolates,4 possibly together with a particular stability of Cu 2 ‐μ‐triolate(3−) assemblies, which are known for glycerol complexes 5…”