Statistics of Interaction of 6,6-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-2,2:6,2-terpyridine (CyMe4-BTTP) with some trivalent ions such as lanthanide(III) ions and americium(III)