Structural complexity in indium selenides prepared using bicyclic amines as structure-directing agents.

The synthesis and characterization of five new indium selenides, [C 9 H 17 N 2 ] 3 [In 5 Se 8+x (Se 2 ) 1−x ] (1–2), [C 6 H 12 N 2 ] 4 [C 6 H 14 N 2 ] 3 [In 10 Se 15 (Se 2 ) 3 ] (3), [C 6 H 14 N 2 ][(C 6 H 12 N 2 ) 2 NaIn 5 Se 9 ] (4) and [enH 2 ][NH 4 ][In 7 Se 12 ] (5), are described. These materials were prepared under solvothermal conditions, using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,4-diazabicyclo[2.2.2]octane (DABCO) as structure-directing agents. Compounds 1–4 represent the first examples of ribbons in indium selenides, and 4 is the first example of incorporation of an alkali metal complex. Compounds 1, 2 and 4 contain closely related [In 5 Se 8+x (Se 2 ) 1−x ] 3− ribbons which differ only in their content of (Se 2 ) 2− anions. These ribbons are interspaced by organic countercations in 1 and 2, while in 4 they are linked by highly unusual [Na(DABCO) 2 ] + units into a three-dimensional framework. Compound 3 contains complex ribbons, with a long repeating sequence of ca. 36 Å, and 4 is a non-centrosymmetric three-dimensional framework, formed as a consequence of the decomposition of DABCO into ethylenediamine (en) and ammonia. [ABSTRACT FROM AUTHOR]

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