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Condensation of 8-hy-droxy-quinoline-2-carbaldehyde with 2-amino-phenol gave the ( E )-2-[(2-hy-droxy-phenyl-imino)-meth-yl]quinolin-8-ol derivative that reacted with di- n -butyl-tin oxide with release of H 2 O to yield the chelate title complex, [Sn 2 (C 4 H 9 ) 4 (C 16 H 10 N 2 O 2 ) 2 ]. The compound crystallizes in the triclinic space group P -1, with two independent centrosymmetric dimers in the unit cell. Each features a typical pincer-type structure where the dianionic ligand is tetra-dentate, coordinating to the central tin atom through both phenolate oxygen atoms, as well as through the quinoline and imine N atoms. Each metal atom adopts a distorted penta-gonal-bipyramidal SnC 2 N 2 O 3 coordination arising from the N , N ', O , O '-tetra-dentate deprotonated Schiff base, one bridging phenolate O atom of the neighbouring ligand and two butyl groups in the axial sites.

acta crystallographica. section e, crystallographic communications

Crystal structure of bis{μ-(E)-2-[(2-oxidophenylimino)methyl]quinolin-8-olato-κ4O,N,N′,O′}bis[dibutyltin(IV)]