Hybrid compounds with chain and layered structures formed by p-alanine

摘要

Inorganic-organic hybrid compounds of the amino acid alanine have been prepared and characterized for the first time. Thus by the reaction of beta-alanine with copper salts, one-dimensional hybrid chain compounds of the formulae [Cu(CO_2CH_2CH_2NH_3)Cl_2], I, and [Cu (H_2O)_2(NH_3CH_2CH_2CO_2)][SO_4] centre dot H_2O, n, and a two-dimensional layered compound [NH_4]_(0.33)[Cu_(0.5)(CO_2CH_2CH_2NH_2)Cl_(0.33)] centre dot H_2O, III, have been obtained and their structures established by X-ray crystallography and other techniques. Hybrid chain alaninates of lead and strontium of the formulae [Pb(CO_2CH_2CH_2NH_3)_2(NO_3)_2], IV and [Sr(CO_2CH_2CH_2NH_3)_2(NO_3)_2], V have also been obtained by the reaction of the corresponding metal salts with alanine. The linear chain compounds, I, II, IV and V contain extended metal-X-metal (X = Cl or O) bonds and have the I~1O~0 type inorganic (I) and organic (O) connectivities. The layered compound III also has metal-X-metal bonds with I~2O~0 type connectivity. Interestingly, the zero-dimensional copper alaninate dimer of the composition [Cu_2(CO_2CH_2CH_2NH_3)_4Cl_2] centre dot 2Cl centre dot H_2O can be transformed to the linear chain structure I or the layered structure III under mild conditions.