The i.r. spectra of substituted ferrocenes were investigated to determine and analyse the appropriate ring-metal stretching force constants. Assignment of the ring-mode vibrations is attempted.

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The dication [Ni(meso-L1)I2+, (11, [the NIl complex of the meso diastereoisomer of the ligand 1,3-bis((oaminophenyl)phenylphosphino}propane, rneso-Ll] on deprotonation gives the neutral complex, [Ni(meso-L1 -2H)],(2), with a cis-disposition of the two amido groups which undergo facile alkylation with propane-l,3-ditoluene-psulphonate to give [Ni(Lz-2H)], (3), a complex of the new P2N2 macrocycle meso-L2; X-ray structure analyses of the nitrate salt of (l), LZ, and (3) confirm the meso-configuration of the ligands.