For PCl6, it is octahedral which is d2sp3; however, adding an electron to make it [PCl6]^- adds an extra electron to an already filled d2sp3 and it really has no place to go. So I think the latter is less stable.

Dec 11, 2024 · He explained the mechanism as: sample of PCl5 exists as a compound of two ions PCl4+ and PCl6- where, PCl4+ acts as a Nucleophile and accepts a lone pair from the double bonded oxygen (step-1).

There are four pairs of electrons surrounding the phosphorus atom in the PCl4+ ion, which requires a tetrahedral arrangement of the pairs. The Lewis structure for PCl6- (5 + 6(7) + 1 = 48 valence electrons) is shown.

Mar 29, 2018 · $\ce{PCl5}$ exists as $\ce{[PCl4+][PCl6-]}$. The lone pairs on the oxygen attack the central phosphorus atom. Step 2: The negatively charged phosphonate complex has high energy (nucleophilic) $\ce{P-Cl}$ bonds. They attack the electrophilic carbonyl carbon.

Jun 15, 1979 · It is suggested that the PCl 6− ion should ionize to PCl 4+ and 2Cl − in the solid under pressure, and evidence has been sought by measuring the phase diagram of phosphorus pentachloride, which has the constitution PCl 4+ PCl 6−. Two new phases were discovered, one of which is wholly metastable relative to the ordinary phase. 1.

Note that solid PCl 5 has an ionic structure and is not a trigonal bipyramidal (bipyramid) molecule - a 4 bond pair tetrahedral [PCl 4] + ion and a 6 bond pair octahedral [PCl 6]-ion, neither of which involve lone pairs. These have been separately described in the appropriate sections.

May 1, 1994 · Lattice potential energy calculations made on [PCl 4+] 2 [PCl 6−] [Cl −] lead to an estimate of the lattice energy of this metastable phase of phosphorus (V) chloride to be 956 kJ mol − (corresponding to 319 kJ mol − per PCl 5 formula unit).

Mar 27, 2006 · Chlorine-35 nuclear quadrupole resonance frequencies in the ionic crystal PCl 4 + ·PCl 6 − were redetermined. Ten resonance lines were found and their temperature dependences were measured below the second order phase transition point at 102 K.

In the reaction 2PC l5 ⇌ PC l4+ + PC l6−, the change in hybridisation is from. PC l5 is sp3 d-hybridized with trigonal bipyramidal. In PC l4+ phosphorous is sp3 hybridized. PC l6− is sp3d2 hybridized with octahedral shape.

Nov 17, 2023 · PCl4+ (Tetrahedral Phosphorus Cation): In PCl4+, phosphorus loses one electron to form a cation. The remaining four electrons participate in bonding with four chlorine atoms, forming four bonding pairs. There are no lone pairs around phosphorus in PCl4+. PCl6- (Octahedral Phosphorus Anion): In PCl6-, phosphorus gains one electron to form an anion.