The silanol ligand HOSi(t)BuAr(2) (1; Ar = 0-C6H4(CH(2)NMe(2))) was prepared from (t)BuSiCl(3) and 2 equiv of LiAr followed by aqueous workup. Reaction of 1 with Y[N(SiMe(3))(2)](3) provided the monosiloxide complex Y[OSi(t)BuAr(2)]-[N(SiMe(3))(2)](2) (2). A single crystal X-ray diffraction study of 2 revealed a highly distorted tetrahedral geometry at Y. Only one of the two 2-(N,N-dimethylaminomethyl)phenyl arms of the siloxide is coordinated. [Crystal data : monoclinic space group I2/a, a = 20.709(3) Angstrom, b = 9.511(1) Angstrom, c = 46.579(6) Angstrom, beta = 98.04(1)degrees, V = 9084.6 Angstrom(3), Z = 8, R = 0.078 and R(W) = 0.101]. Reaction of 2 with 2 equiv of HOC(6)H(3)(t)Bu(2)-2,6 afforded Y[OSi(t)BuAr(2)][OC(6)H(3)(t)Bu(2)-2,6](2) (3) in good yield. Complexes 2 and 3 exhibit very similar fluxional behavior in solution. Two separate fluxional processes were distinguished by H-1 NMR : a lower temperature process involving restricted rotation of the silylamide (2, Delta G*(rotation) = 53 +/- 1 kJ/mol) or phenoxide (3, Delta G*(rotation) = 57 +/- 1 kJ/mol) groups and a higher temperature process involving exchange of free and coordinated 2-(N,N-dimethylamino-methyl)phenyl arms (2, Delta G*(arm exchange) = 72 +/- 1 kJ/mol; 3, Delta G*(arm exchange) = 75 +/- 1 kJ/mol). Complex 3 reacts with 2 equiv of LiCH(2)SiMe(3) to give Li+{Y[OSi(t)BuAr(2)][OC(6)H(3)(t)Bu(2)-2,6][CH(2)SiMe(3)](2)}(-) (4). Attempts to prepare a neutral dialkyl by elimination of the remaining LiOC(6)H(3)(t)Bu(2)-2,6 were not successful. Complex 4 exhibits complex fluxional behavior in solution by H-1 NMR.