Nuclear quadrupole resonance spectra of chlorine in some d8-transition-metal complexes

Abstract

The ³⁵Cl nuclear quadrupole resonance frequencies in some 22 compounds of the type L₂MCl₂(M = Ni^II, Pd^II, or Pt^II have been detected and are discussed in terms of the electronic structure of the complex. In trans-L₂PdCl₂ complexes, the ³⁵Cl frequencies appear to depend on the electron-donor power of the ligand L. The ³⁵Cl resonance signals in three trans-L₂PtCl₂ complexes are found at higher frequencies than in the corresponding cis-complex, and this difference is related to the charges on the ligands. In trans-(Buⁿ₃PPdCl₂)₂, the bridging ³⁵Cl signal is found near 12·8 MHz at 0 °C, considerably lower than the terminal ³⁵Cl signal at 19·50 MHz.