CHELATING BEHAVIOUR OF 2,4,9,11-TETRAPHENYL-1,5,8,12- TETRAAZACYCLOTETRADECA -1,4,8,11-TETRAENE WITH SOME DIVALANT METALS LIKE Cu(II), Ni(II), Fe(II), Co(II) METAL IONS - Deepshikha; Gupta, Mamta (International Journal of Advance Research and Innovative Ideas In Education, 2024)