Publication: Datiscetin (2’,3,5,7-Tetrahidroksiflavon)’in Alüminyum (III) ve Demir (II) ile oluşturduğu komplekslerin kararlılık sabitlerinin potansiyometrik ve spektrofotometrik olarak tayini
Abstract
DATİSCETİN (2’,3,5,7-TETRAHİDROKSİFLAVON)’İN ALÜMİNYUM (III) VE DEMİR (II)) İLE OLUŞTURDUĞU KOMPLEKSLERİN KARARLILIK SABİTLERİNİN POTANSİYOMETRİK VE SPEKTROFOTOMETRİK OLARAK TAYİNİ Günümüzde çeşitli bitki çayların içerisinde bulunan datiscetinin; gıda kimyası, boya kimyası, tıp kimyası, boya endüstrisi alanlarında kullanılmaktadır. Genellikle birçok bitkinin kök, gövde ve çiçeklerinde farklı flavonoidlerle birlikte bulunur. Bu çalışmada datiscetinin doğal boyamacılıkta mordan metalleri olarak bilinen demir (II) ve alimünyum (III) ile oluşturdukları komplekslerin kararlılık sabitleri Calvin-Bjerrum ve Irwing-Rossotti yöntemleri kullanılarak potansiyometrik yoldan tayin edildi. Ayrıca oluşan kompleksler spektrofotometrik yolla da desteklendi. Datiscetin dissosiyasyon sabiti potansiyometrik yöntemle logK1=3,31 olarak bulundu. Yine potansiyometrik olarak Irwing-Rossoti metoduyla oluşum sabitleri ise I=0,0043’de demir (II) için logK1= 4,10, alimünyum (III) için logK1= 4,63 olarak bulundu. Oluşan kompekslerin koşullu oluşum sabitleri hesaplandı ve buradan kompleksleşmenin ortaya çıktığı pH aralıkları bulundu. Demir (II) - datiscetin ve Alimünyum (III)-datiscetin çözeltilerinin ayrı ayrı spektrofotometrik ölçümleri alındı ve bu ölçümler sonucunda kompleks oluşumunun gerçekleştiği görüldü. Demir (II) ve Alimünyum (III) komplekslerinin bileşimleri ligand/ metal=1/ 1 olarak bulundu ve bunların yapıları tartışıldı.
DETERMINATION OF STABILITY CONSTANTS OF DATISCETIN (2,3, 5, 7 TETRAHYROXYFLAVON) COMPLEXES WITH IRON (II) AND ALUMINIUM (III) BY POTENTIOMETRIC AND SPECTROPHOTOMETRIC METHODS Datiscetin which is found in various kinds of herbal tea is used in, food chemistry, medicinal chemistry, dye industry. It generally occurs with different kind of flavonoids in roots, stems and blossoms of plants. In this study, the stability constants of the iron (II) and aluminium (III) complexes of datiscetin were determined potentiometrically by using Calvin-Bjerrum and Irwing Rossotti methods and by spectrophotometric method. logK1=3,31 were found with the method of the evaluated protonation constants of the ligand. For the meal complexes, logarithms of the stability constants were found by Irwing-Rossotti method, for iron (II) complex logK1 = 4.10 and for aluminium (III) complex logK1= 4.63 at I= 0,0043 conditional formation constants for complex are calculated and pH ranges which complexation occurred are found. Absorption spectra measurements are recorded for iron (II) - datiscetin and aluminium (III) – datiscetin solutions. As a consequence of this, formation of complexes has been observed. From the results, the components of datiscetin/ metal complexes are given 1/ 1 both iron (II) and aluminium (III).
DETERMINATION OF STABILITY CONSTANTS OF DATISCETIN (2,3, 5, 7 TETRAHYROXYFLAVON) COMPLEXES WITH IRON (II) AND ALUMINIUM (III) BY POTENTIOMETRIC AND SPECTROPHOTOMETRIC METHODS Datiscetin which is found in various kinds of herbal tea is used in, food chemistry, medicinal chemistry, dye industry. It generally occurs with different kind of flavonoids in roots, stems and blossoms of plants. In this study, the stability constants of the iron (II) and aluminium (III) complexes of datiscetin were determined potentiometrically by using Calvin-Bjerrum and Irwing Rossotti methods and by spectrophotometric method. logK1=3,31 were found with the method of the evaluated protonation constants of the ligand. For the meal complexes, logarithms of the stability constants were found by Irwing-Rossotti method, for iron (II) complex logK1 = 4.10 and for aluminium (III) complex logK1= 4.63 at I= 0,0043 conditional formation constants for complex are calculated and pH ranges which complexation occurred are found. Absorption spectra measurements are recorded for iron (II) - datiscetin and aluminium (III) – datiscetin solutions. As a consequence of this, formation of complexes has been observed. From the results, the components of datiscetin/ metal complexes are given 1/ 1 both iron (II) and aluminium (III).