The paper reports results of measurements of the ClKα shifts in the X-ray fluorescence spectra and 3 5 Cl-NQR frequency for a group of tetrachloride titanium complexes. The experimental ClKα shifts were correlated with the parameters describing donor properties of ligands such as ligand strength (DN), ionisation potential (IP) or parameters of influence (P). Analysis of the correlation dependencies has indicated that changes in the electronic density on the chloride atom of the acceptor, taking place upon complexation, are determined by the polarisation effects.