Stephen D. Robinson and Arvind Sahajpal
J. Chem. Soc., Dalton Trans., 1997, 3349-3352
DOI:
10.1039/A702940C,
Paper
*
′-Diphenylguanidine reacted with
the hydrido complexes [MH
2
(CO)(PPh
3
)
3
]
(M = Ru or Os) and
mer-[IrH
3
(PPh
3
)
3
] in boiling
toluene to afford the complexes
[MH{PhNC(NH
2
)NPh}(CO)(PPh
3
)
2
]
and
[IrH
2
{PhNC(NH
2
)NPh}(PPh
3
)
2
] in which the
N,N′-diphenylguanidinate anions adopt a
symmetrical chelate co-ordination mode. Under similar conditions the
trifluoroacetato complexes
[M(O
2
CCF
3
)
2
(CO)(PPh
3
)
2
] afforded salts
[M{PhNC(NH
2
)NPh}{PhNC(NH
2
)NPh
·H}(CO)(PPh
3
)
2
][O
2
CCF
3
] containing one chelate
N,N′-diphenylguanidinate anion and one
monodentate N,N′-diphenylguanidine
ligand. Spectroscopic evidence indicates that the trifluoroacetate
anions are hydrogen bonded to one or more of the N-bound hydrogens.