Darstellungen und Strukturen viergliedriger Metall-Stickstoff-Ringe

Ph 3 P=NSiMe 3 (1) reacts with InCl 3 , SnCl 2 and FeCl 3 to yield (Ph 3 P=N) 2 (InCl 2 ) 2 • 2DMF (2a), (Ph 3 P=N) 2 Sn 2 Cl 4 • 2 CH 3 CN (3a) and (Ph 3 P=N) 2 (FeCl 2 ) 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)Cl 3 group in the four-membered ring.