Bis{decacarbonylbis[mu-2,2 `-(phenylimino)diethanolato]ditin(II)ditungsten(0)(2 Sn-W)} hexacarbonyltungsten(0)

Abstract

In the title 2:1 adduct, [Sn(2)W(2)(C(10)H(13)NO(2))(2)(CO)(10)](2)[W(CO)(6)], the complete hexacarbonyltungsten molecule is generated by a crystallographic inversion centre. The heterometallic molecule features a central Sn(2)O(2) core with essentially equal Sn-O(ethoxy) bond lengths. The second ethoxy O and amine N atoms of each N,O,O'-tridentate ligand coordinate to one Sn atom only. The NO(3) donor atoms occupy basal positions and the W atom the apical position in a distorted square-pyramidal geometry for each Sn atom. The W atoms are approximately syn to each other but the central metal core is non-planar [W-Sn center dot center dot center dot Sn-W pseudo-torsion angle = 43.573 (16)degrees]. One of the carbonyl ligands in the heterometallic molecule is disordered over two orientations with equal occupancies. In the crystal, the heterometallic molecules associate via C-H center dot center dot center dot O interactions, forming supramolecular layers with undulating topology in the ab plane. These stack along the c axis, defining voids which are occupied by the W(CO)(6) molecules