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The new iron-tin metal cluster system (CH 2 CH) 2 Sn 2 Fe 4 (CO) 16 has been isolated as a by-product of the reaction between (CH 2 CH) 2 Sn(O 2 CCF 3 ) 2 and Na 2 [Fe(CO) 4 ] and characterised by chemical analyses, mass spectrometry, and infra-red spectroscopy.

The reaction between [Mo2(O2CCF3)4] and 2,2′-bipyridyl (1: 2) has been investigated in several solvents, and four different adducts, two 1:1 and two 1:2 compounds, have been isolated and characterised. The reaction between [Mo2(O2CCF3)4], 2,2′-bipyridyl, and [OEt3][BF4](1:2:2) has been shown to produce [Mo2(O2CCF3)2(bipy)2]-[BF4]2. Structures have been assigned to these compounds on the basis of spectroscopic data and the nature of the solution species, from which the various adducts originate, is discussed.

Molybdenum(II) trifluoroacetate adducts [Mo2(O2CCF3)4Xn]n–(n= 1, X = Cl, Br, I, O2CCF3, or SnCl3; n= 2, X = Br or I) have been synthesised and characterised by i.r., Raman, and u.v.–visible spectroscopy. The metal–metal stretching frequencies occur in the range 382–366 cm–1, that of a monoadduct being higher than that of the corresponding diadduct. The effect of addended ligands on the Mo–Mo bond in compounds of this type is discussed in the light of these and other data. The new substituted derivatives [Et4N]2[Mo2(O2CCF3)3Cl3] and [Et4N]4[Mo2(CN)8] have been characterised.