اندازه گیری ثابتهای اسیدی 4-(2- تیازول‌ آزو)رزوسینول بوسیله طیف سنجی فرابنفش و شیمی سنجی در مخلوطهای دوتایی آب-استونیتریل و آب-دیوکسان

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

دانشکده شیمی، دانشگاه یزد، یزد، ایران

چکیده

در این مقاله با تلفیق روش طیف سنجی فرابنفش و روش شیمی سنجی، ثابت تفکیک اسیدی 4‏-(2- تیازول‏آزو)رزوسینول اندازه-گیری شد. طیف جذبی محلول 4‏-(2- تیازول‏آزو)رزوسینول دارای همپوشانی طیفی زیادی است، بنابراین تعیین ثابت تفکیک اسیدی آن با استفاده از روش طیف سنجی معمولی مشکل خواهد بود. با استفاده از طیف سنجی فرابنفش -مرئی و روش آنالیز فاکتوری کاهش دو مرتبه (TRAFA)، ثابت‌های اسیدی، تعداد گونه‌ها، کسر مولی، نمودار انحراف استاندارد نسبی (RSD) و طیف خالص گونه‌های حاصل از تفکیک اسیدی 4‏-(2- تیازول‏آزو)رزوسینول در محلول 0/20 تا 0/80 درصد حجمی استونیتریل در آب و دی‌اکسان در آب محاسبه شد. نتایج به‌دست آمده توسط روش فوق نشان ‌دهنده کارایی این روش در تعیین محلول با همپوشانی طیفی بالاست.با بررسی ثابت تفکیک اسیدی 4‏-(2- تیازول‏آزو)رزوسینول در حلال‌های مختلف مشخص می‌شود که با افزایش درصد حلال‌ها ثابت اسیدی کوچکتر می‌شود که این را می‌توان به این‌صورت توضیح داد که قدرت حلال‌پوشی و ثابت دی‌الکتریک آب ، استونیتریل و دی‌اکسان با هم متفاوتند. مقدار این متغیرها به پارامترهای فیزیکی (ثابت دی‌الکتریک و عدد القایی) وابسته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Measurement of 4-(2-thiazole azo) rososinol acidy constants by means of ultraviolet spectroscopy and chemometrics in water-acetonitrile and water-dioxane binary mixtures

نویسندگان [English]

  • Mansoor Namazian
  • Shahriar Jahanbani
  • Ali Benvidi
Faculty of Chemistry, Yazd University, Yazd, Iran
چکیده [English]

In this paper, by combining ultraviolet spectroscopy and Chemometrics method, the acid dissociation constant of 4- (2-thiazole azo) rososinol was measured. The absorption spectra of the 4- (2-thiazole azo) rososinol solution have a large spectral overlap, so it will be difficult to determine its acid dissociation constant using conventional spectroscopy. Using ultraviolet-visible spectroscopy and two rank annihilation factor analysis (TRAFA), acid constants, number of species, molar fraction, relative standard deviation (RSD) and net species spectrum acid dissociation of 4- (2-thiazole azo) rososinol in 20 to 80% v/v of acetonitrile in water and dioxane in water was calculated. The results obtained by the two rank annihilation factor analysis method show the efficiency of this method in determining the solution with high spectral overlap. As the percentage of solvents increases, the acid constant becomes smaller, which can be explained by the fact that the solubility and dielectric constant of water, acetonitrile and dioxane are different. The value of these variables depends on the physical parameters (dielectric constant and induction number).

کلیدواژه‌ها [English]

  • ‎4- (2-thiazole azo) rososinol ‎
  • ultraviolet spectroscopy ‎
  • two rank annihilation factor analysis ‎
  • acid dissociation constant
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