SYNTHESIS, STRUCTURE AND RELATIVE HYDROLYTIC STABILITY OF CIS-[PTCL2L] AND CIS-[W(CO)4L] WHERE L IS THE BIDENTATE TRIAMINOPHOSPHINE LIGAND [MENCH2CH2N(ME)PN(ME)CH2]2

The ligand MeNCH2CH2N(Me)PN(Me)CH2CH2N(Me)PN(Me)CH2CH2NMe (L) reacted with [{Pt(C2H4)Cl2}2] to give a mixture of cis-[PtCl2L] and trans-[{PtCl2(mu-L)}2] and with [W(CO)4(nbd)] (nbd = norbornadiene) to give cis-[W(CO)4L] and [{W(CO)4(mu-L)}n] (n = 2-4). The ligand L and [W(CO)4L] are readily hydrolysed to give HPO32-, 2MeNHCH2CH2NHMe+ and MeNHCH2CH2NHMe. In contrast the complex [PtCl2L] is considerably more resistant to ligand hydrolysis. The molecular structures of cis-[PtCl2L], cis-[W(CO)4L] and [W(CO)4(MeNHCH2CH2NHMe)] {a hydrolysis product of the reaction of [W(CO)4L] with water} have been determined by single-crystal X-ray diffraction studies. Crystal data (all monoclinic): cis-[PtCl2L], space group Cc, a = 17.986(2), b = 9.286(1), c = 12.059(1) angstrom, beta = 91.07(1)degrees, Z = 4, R = 0.024 (R'= 0.028); cis-[W(CO)L], space group Pn, a = 15.611(3), b = 8.437(2), c = 27.604(6), beta = 99.78(3)degrees, Z = 6, R = 0.036 (R' = 0.039); [W(CO)4-(MeNHCH2CH2NHMe], space group C2/c, a = 22.960(2), b = 7.456(1), c = 14.039(1) angstrom, beta = 106.60 (1)degrees, Z = 8, R = 0.040 (R' = 0.045).