Abstract
The crystals of cyclic oxaalkyl diamide of o-phthalic acid (CPhDA) and its complex with lead(II) perchlorate (CPhDA–Pb(ClO 4) 2–H 2O (6:2:3)) were obtained from acetonitrile and were studied using X-ray crystallography and FT-IR spectroscopy. CPhDA crystallises in the centrosymmetric space group ( P2 1/ n) of monoclinic system, while its complex with Pb(ClO 4) 2 in the space group R 3 ¯ of rhombohedral system. The conformation of CPhDA does not change significantly upon coordination of the Pb 2+cation. Within the complex structure all six carbonyl oxygen atoms of the three CPhDA ligand molecules coordinate the Pb 2+ cation with comparable bond lengths forming a cationic complex [Pb(CPhDA) 3] 2+. One water molecule occupies the centro-symmetric position in the cationic [(CPhDA) 3⋯Pb 2+⋯(H 2O)⋯Pb 2+⋯(CPhDA) 3] dimeric structure. The FT-IR spectrum of the complex shows the characteristic shifts of amide I and amide II bands as all oxygen atoms of the carbonyl group are involved in complexation.
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