Coordination modes of N-2-(4-amino-1-methyl-5-nitroso-6-oxo-1,6-dihydropyrimidinyl) potassium L-alaninate toward Ag(I), Cd(II) and Pd(II). Crystal structure of {Ag((#eta#~4-#mu#_3-L)] centre dot 3H_2O}_n, first example of a silver 3D-polymer with a p

摘要

The acid-base behaviour of the N-2-(4-amino-1-methyl-5-nitroso-6-oxo-1,6-dihydropyrimidinyl) potassium L-alaninate (KL) and its reactivity with Ag(I), Cd(II) and Pd(II) metal ions have been studied. Three solid species with formulae AgL centre dot 3H_2O, CdL_2 centre dot 6H_2O and PdClL centre dot H_2O have been obtained and characterized by IR, ~1H and ~(13)C NMR spectroscopic methods and thermal, conductivity and magnetic measurements. The structure of {Ag((#eta#~4-#mu#_3-L)] centre dot 3H_2O}_n had been established by single-crystal X-ray diffraction and consists in a 3D-polymer. Within the polymer each Ag(I) ion is tetrahedrally coordinated to three differents L anions, while each ligand is coordinated in a rather unusual #eta#~4-#mu#_3 coordination mode. Spectroscopic data show a similar coordination mode for the Cd(II) complex, while for the Pd(II) one a different coordination mode is proposed.