Abstract
A cyclic alkyl(amino) carbene (cAAC) stabilized dimer (cAAC)Si(P-Tip)2 (2) (Tip = 2,4,6-triisopropylphenyl) is reported. 2 can be considered as a dimer of the heavier ketenimine (R2C=C=N-R) analog. The dark-red rod-shaped crystals of 2 were synthesized by redn. of the precursor, cAAC-dichlorosilylene-stabilized phosphinidene (cAAC)SiCl2$\rightarrow$P-Tip with sodium naphthalenide. The crystals of 2 are storable at room temp. for several months and stable up to 215 °C under an inert atm. X-ray single-crystal diffraction revealed that 2 contains a cyclic nonplanar four-membered SiPSiP ring. Magnetic susceptibility measurements confirmed the singlet spin ground state of 2. Cyclic voltammetry of 2 showed a quasi-reversible one-electron redn. indicating the formation of the corresponding radical anion 2.bul.-, which was further characterized by EPR measurements in soln. The electronic structure and bonding of 2 and 2.bul.- were studied by theor. calcns. The exptl. obtained data are in good agreement with the calcd. values. on SciFinder(R)
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