Silylmethyl and related complexes. 5. Metallocene bis(trimethylsilyl)methyls and benzhydryls of early transition metals [M(.eta.5-C5H5)2R](M = T or V) and [M(.eta.5-C5H5)2(X)R](M = Z or H and X = C or R), and the crystal and molecular structures of [M(.eta.5-C5H5)2(CHPh2)2](M = Z or H)