Ratios of quadrupole splittings: determination of quadrupole parameters for ruthenium-99 and tin-119

Abstract

Partial quadrupole splitting values from Fe^II low-spin compounds are used to obtain the sign of e²qQ* for nine Ru^II compounds; from the ratios of quadrupole splittings of Ru^II and Fe^II analogues, the ⁹⁹Ru quadrupole moment, Q*, has been calculated to be |0·34|± 0·07 × 10^–28 m². The Ru quadrupole splittings and centre shifts for [Ru(NH₃)₅L]²⁺ compounds (L = N₂, CO, or MeCN) indicate that N₂ is relatively a poor σ donor but a moderate π acceptor.

By comparing ¹¹⁹Sn and ¹²¹Sb e²qQ values for isoelectronic and isostructural compounds, the quadrupole moment of ¹¹⁹Sn is calculated to be –0·062 ± 0·02 × 10^–28 m². The quadrupole splitting of the SnCl₅^– ion is deduced to be negative.