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Spectrophotometric Study of Acidity and Complex Formation of Anti-Inflammatory Drug Piroxicam with Some Transition Metal Ions in Different Methanol/Water Mixtures by Chemometric Methods

Chemometric 방법에 의한 메탄올/물 계에서 전이 금속 이온과 소염제 Piroxicam의 산성도 및 착체 형성에 관한 분광광도법 연구

  • Ghasemi, Jahan B. (Chemistry Department, Faculty of Sciences, K. N. Toosi University of Technology) ;
  • Jalalvand, Alireza (Department of Analytical Chemistry, Faculty of Chemistry, Razi University)
  • Published : 2009.12.20

Abstract

The complex formation of anti-inflamatory drug piroxicam (PX, 4-hydroxy-2-methyl-N-2--pridyl-2H-1,2-benzothiazine-3-carboxadiamide-1,1-dioxide) with transition metal ions Co(II), Ni(II), Cu(II) and Zn(II) in methanol(MeOH)/water binary mixtures were studied by spectrophotometric method at 25$^{\circ}C$, constant pH = 5.0 and I = 0.1 M. The computer program SQUAD was used to extract the desired information from the spectral data. The outputs of the fitting processes were stability constants, standard deviations of the estimated stability constants, concentration distribution diagrams and spectral profiles of all species. The sequence of the stability constants of PX complexes with Co(II), Ni(II), Cu(II) and Zn(II) follow the Cu(II) > Co(II) > Ni(II) ${\approx}$ Zn(II) order. This may be due to different geometry tendencies of these metal ions. The acidity constants of the PX were also determined under above condition from its absorption spectra at different pH values. The computer program DATAN was used for determination of acidity constants of PX. The validity of the obtained acidity constants was checked by a well known computer program SPECFIT/32. The effects of the different parameters like solvent nature, cations characteristics on the stability and acidity constants were thoroughly discussed.

소염제 piroxicam (PX, 4-hydroxy-2-methyl-N-2-pridyl-2H-1, 2-benzothiazine-3-carboxadiamide-1,1-dioxide)의 착물형성을 전이금속이온, Co(II), Ni(II), Cu(II), Zn(II)과 함께 메탄올(MeOH)/물 이성분 혼합물에서 25$^{\circ}C$, 일정한 pH=5.0와 I=0.1 M에서 분광광도법으로 연구하였다. 컴퓨터 프로그램 SQUAD를 스팩트라 데이터로부터 원하는 정보를 얻는데 사용하였다. Fitting 과정의 output은 안정도 상수, 평가한 안정도 상수의 표준편차, 농도분포 다아그램, 모든 종의 스팩트럼 프로파일이다. Co(II), Ni(II), Cu(II), Zn(II)의 PX 착체의 안정도 순서는 Cu(II) > Co(II) > Ni(II) ${\approx}$ Zn(II) 순서이다. 이것은 이들 금속이 온들이 기하학적 경향이 다른 이유일 것이다. PX의 산성도 상수는 다른 pH 값에서 흡수 스펙트럼으로 부터 위의 조건에서 역시 결정하였다. 컴퓨터 프로그램 DATAN을 PX의 산성도 상수의 결정하는 데 사용하였다. 산성도 상수의 validity는 잘 알려진 컴퓨터 프로그램 SPECFIT/32을 사용하였다. 안정 및 산성도 상수의 용매성질, 음이온과 같은 다른 인자의 효과에 관하여 자세하게 논의하였다.

Keywords

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