Se 2 2 - , Se 5 2 - , and Se 7 2 - Ligands in [NEt 4 ] 2 [As 2 Se 6 ], [enH][AsSe 6 ]·2.2.2-cryptand, [NEt 4 ][AsSe 8 ], and [(en) 2 In(SeAs(Se)Se 2 )]·en
1998; American Chemical Society; Volume: 37; Issue: 10 Linguagem: Inglês
10.1021/ic971181h
ISSN1520-510X
AutoresDonna M. Smith, Michael A. Pell, James A. Ibers,
Tópico(s)Organic and Molecular Conductors Research
ResumoThe extraction in ethylenediamine (en) of "AsSe4", "TlAsSe4", and "InAsSe4", followed by reaction with cation sources or 2.2.2-cryptand, has led to the isolation of [NEt4]2[As2Se6] (1), [enH][AsSe6]·2.2.2-cryptand (2), [NEt4][AsSe8] (3), and [(en)2In(SeAs(Se)Se2)]·en (4). These compounds contain AsSe+ units coordinated to Se22-, Se52-, and Se72- ligands in 1 and 4, 2, and 3, respectively. The [As2Se6]2- anion features two AsSe+ units joined by Se22- ligands; the resultant As2Se4 ring exhibits a chair conformation. The [AsSe6]- anion features an AsSe+ unit coordinated in a bidentate fashion by a Se52- ligand to create an AsSe5 ring with a chair conformation. The [AsSe8]- anion contains an AsSe+ unit coordinated by a bidentate Se72- ligand; the resultant AsSe7 ring has a crown conformation. [(en)2In(SeAs(Se)Se2)] features an octahedral In atom bridged by one Se2- and one Se22- ligand to an AsSe+ unit; two bidentate en ligands complete the coordination about the In center.
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