Isocyanide Coordination to Three Metal Atoms

A one-electron reduction of the analogous [Ni3(dppm)3( X3-l)( X3-T t t -CN-2,6-Me2CisH3)] complex decreases v(N=C) from 1849/1822 to 1723 cm . These 100-250cm decreases in v(N=C) with a one-electron reduction of Ni3(dppm)3( X3-l) (IX3-TI t t -CNR) indicate that v(N=C) values for 1X3-13 13 t isocyanides adsorbed on metal surfaces might be expected over a rather broad range. 

Investigations of the adsorption of isocyanides on metal surfaces use various analytical techniques. Table 13.2 lists the techniques and their acronyms that are used throughout this chapter. Because isocyanides adsorbed on metal surfaces are often characterized by their v(N=C) stretching frequencies, these vibrational data are summarized in Table 13.3. Also given in Table 13.3 are v(N=C) values of the free (unadsorbed) isocyanides and brief descriptions of the proposed adsorption modes, which are often based on interpretations of the v(N=C) values as discussed in the following sections. 

---