Ph3P=NSiMe3 (1) reacts with InCl3 , SnCl2 and FeCl3 to yield (Ph3P=N)2(InCl2)2 • 2DMF (2a), (Ph3P=N)2Sn2Cl4 • 2 CH3CN (3a) and (Ph3P=N)2 (FeCl2)2 (4). The X-ray single crystal structures of 2a, 3a and 4 are reported. The compounds form four-membered rings consisting of alternating metal and nitrogen atoms. 2a and 4 are symmetrical, but 3a has both a Sn(II)Cl and a Sn(IV)Cl3 group in the four-membered ring.