Kinetics and mechanism of complexation reactions of (I) Ni (II), Co(II), Cu(II)-L-x-amino-B-indolepropionic acid, (II) Ni(II), Cu(II)-L-x- aminoglutaric acid, (III) Ni(III)-L-x-aminoisocaprioc acid, L-x-amino-r-methylthio-n-butyric acid, histidine methy