Bidentate ligands salicylato

E. Compounds Containing Two Bidentate Ligands of the Salicylato(2-) Type... 

The spirocyclic zwitterionic A5A/-silicates 77,52 78,53 and 7953 contain two bidentate salicylato(2-) ligands. The chiral zwitterions are built up by two six-membered Si02C3 ring systems that are connected by the silicon spirocenter, whereas all the other spirocyclic A5A/-silicates described in Section III contain two five-membered Si02C2 (III,A to III,D) or Si02CN rings (III,F). 

Measurements of the low-frequency Raman spectrum of TIN3 at various temperatures are consistent with the existence of a low-temperature phase transition, involving distortion of the ion, at 225 K. Salicylato-(l,10-phenanthroline)thallium(i) exists in dimeric form with five-co-ordinate Tl. The phenanthroline is bidentate, with T1—N distances of 2.65 and 2.71 A, as is the salicylato ligand, although it is here markedly unsymmetrical (with Tl—O distances of 2.65, 2.98 A). Further, the former oxygen undergoes a weak bridging interaction with the second Tl atom of the dimer (Tl O = 3.00 A). ... 

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