Second Harmonic Generation of Eta(5)-Monocyclopentadienyl Ruthenium P-Benzonitrile Derivatives by Kurtz Powder Technique. Crystal and Molecular Structure Determinations of [Ru(Eta(5)-C5H5)((+)-Diop)(P-Ncc6H4No2)][X], X = Pf6-, Cf3So3- and [Ru(Eta(5)-C5H5)((+)-Diop)(Ncch3)][Pf6]