He is a corresponding member of the French Academy of sciences[1] and Professor Emeritus at the Pierre and Marie Curie University.
He is preparing a PhD thesis in Physical Sciences (1962) under the supervision of Pr J. Bénard, on the crystallochemistry of titanium sulphides.
In research, Jeannin shows an interest in the chemistry of transition metals, in the synthesis and structure of the species they form.
[6][7][8] The laboratory has made a major contribution to the development of their synthesis and structural study by X-ray and NMR of tungsten, holding the record for the largest known polytungstate.
[17] In order to carry out this research on the creation of a centre for structure determination by X-ray diffraction, he was made available to French and foreign chemists and to external laboratories.