  The deposition of a monolayer by direct self-assembly from solution of an
active spin-crossover (SCO) complex via chemisorption has been achieved
starting from the perchlorate salt of Co(II)
bis(4-(4-carboxyphenyl)-2,2:6,2-terpyridine). MALDI-TOF MS, Raman spectroscopy
and X-ray photoelectron spectroscopy (XPS) confirm the presence of an intact
monolayer of SCO molecules grafted through carboxylate groups to the Ag
surface. Three different spectroscopic techniques (Raman, XPS and X-ray
Absorption spectroscopy, XAS) evidence a thermal spin transition of such
monolayer of molecules. To our knowledge, this is the first example of an
active SCO assembly in direct contact with a surface obtained by wet chemistry.
