Encapsulation of molecular Na2SiF6 by two metallacrown complexes

Abstract

A complex of molecular Na2SiF6, stabilised by two 12-metallacrown-3 host complexes, has been synthesised and characterised by single crystal X-ray diffraction.

Supramolecular chemistry with organometallic half-sandwich complexes

“…36 This can be attributed to several facts: (a) the receptors are very rigid and ideally preorganized to bind lithium or sodium ions; (b) the salts are bound as an ion pair; (c) the energetic for the desolvation of the receptors are very low because a maximum of one solvent molecule can fit inside the binding cavity; (d) the oxygen donor atoms have a high partial negative charge. 54 The outstanding affinity of the 12-metallacrown-3 complexes for lithium and sodium salts was utilized to capture molecular LiF 55 and Na 2 SiF 6 56 (Fig. 5).…”

New Catalysts and Receptors by Self-Assembly and Combinatorial Chemistry

“…The class of compounds that we are focusing on are macrocycles which are obtained by reaction of tridentate ligands with organometallic complexes of (arene)Ru II [23][24][25][26][27][28][29][30][31][32], Cp*Ir III [31][32][33], Cp*Rh III [24][30] and (CO) 3 Re I [34] (Fig. 2).…”

“…Similar to their organic counterparts they can bind lithium and sodium ions, although with much higher affinity and selectivity [23][24][25]. This was used to develop a specific chemosensor for Li + [28] and to stabilize the unusual molecular forms of LiF [31] and Na 2 SiF 6 [26]. If 2,3-dihydroxypyridine ligands with amino-substituents are employed, it is possible to generate trinuclear macrocycles, which are soluble in water at neutral pH.…”

(Hexafluorosilicato-κ2F,F′)bis(1,10-phenanthroline-κ2N,N′)zinc(II) methanol monosolvate

“…This is of particular interest considering that linear [Zn(-SiF 6 )] n pillars, formed through the bridging of Zn II cations by the F atoms in axial positions, are often exploited as building blocks in the construction of coordination networks (Larpent et al, 2013, and references therein). Examples of structurally characterized complexes containing a hexafluorosilicate ligand in a chelate binding mode for other metal ions are also scarce (Fleming et al, 1998;Lehaire et al, 2002).…”