Abstract
Carbocisteine, also known as carbocysteine, is a mucolytic that reduces the viscosity of sputum and thus can be used to help relieve symptoms of chronic obstructive pulmonary disorder and bronchiectasis by allowing the sufferer to expel sputum more easily. A total of three new metal complexes of carbocysteine, HCcy with the metal ions Sr(II), Ba(II), and Pb(II) have been successfully prepared in alkaline medium in situ H2O/CH3OH (50/50 w/w). The complexes obtained are characterized quantitatively and qualitatively by using micro elemental analysis, FTIR spectroscopy, UV-Vis spectroscopy, X-ray powder diffraction spectroscopy, H-1-NMR, and conductivity measurements. From the spectral study, all the synthesized Ccy complexes obtained as monomeric structure and the metals center moieties are six-coordinated except lead(II) complex which existed as a four-coordinated respectively, suggesting formulas ESr(Ccy) (H2O)(2)] [Ba(Ccy) (H2O)(2)] and [Pb(Ccy)] in neutral form. Beside, regarding both Sr(II) and Ba (II) complexes, the aquo groups are existed inside the coordination sphere. The infrared assignments reveal that HCcy ligand act as a bidentate ligand with the metal ions through oxygens of the deprotonated carboxylic COOH group. The H-1-NMR spectrum of the [Ba(Ccy) (H2O)(2)] complex has an absent of the proton of -COOH groups upon the deprotonated of carboxylic group.