Effect of anions on the solid-state interplay of symmetric and unsymmetric phosphonium cations

Abstract

Crystallographic studies of salts of quaternary phosphonium cations, tetraphenylphosphonium and benzyltriphenylphosphonium, reveal differences in size and shape of the phosphonium cations dominate the intermolecular packing with the cations self-associated through phenyl embraces.

Elucidating the Hydrotropic Mechanism of the Antagonistic Salt PPh4Cl

“…Multiplication of g ( r ) by the density factor ρ helps us compare systems of different densities. The center of mass (COM) ρg ( r ) for the pair TP–TP (Figure (a)) reveals a sharp peak around 7 Å consistent with crystallographic data . Due to the bulky nature of the ions, the first coordination shell appears at 8.5 Å.…”

“…We propose a modification where two TP molecules, each having its solvation shell, are oriented in an edge-to-face manner. 72 The COM separation between two solvated TPs is then around 8.5 Å per the SAXS data (Figure 5). Our model allows two TP molecules to approach closer to each other while preserving the surrounding water layer.…”

“…The authors attributed the distance between the phenyl rings of two adjacent TPs to around 7–8 Å to match the SAXS correlation peak at 8–9 nm –1 . We propose a modification where two TP molecules, each having its solvation shell, are oriented in an edge-to-face manner . The COM separation between two solvated TPs is then around 8.5 Å per the SAXS data (Figure ).…”

“…The center of mass (COM) ρg(r) for the pair TP−TP (Figure 2 consistent with crystallographic data. 72 Due to the bulky nature of the ions, the first coordination shell appears at 8.5 Å.…”

Cyano(fluoro)borate and cyano(hydrido)borate ionic liquids: low-viscosity ionic media for electrochemical applications

“…aThe crystal structures of [BnPh 3 P][BF 4 ] 93 and [BnPh 3 P][PF 6 ] 94 have been studied at 100 K, earlier. In case of [BnPh 3 P][BF 4 ] the structure was redetermined and the respective values are given in Table 1.bCalculated at the BP96/def2-SVP level of theory.cIdealized symmetry of the anion.ds.g.…”