Electronic absorption studies of the complexes with 2-amino benzothiazole derivatives doped in Nd (III) ion have been calculated. In present work, we describes the spectral characterization of the complexes of benzothiazole derivatives with Nd(III) ion in agreement to Green chemistry approach. For eleven different peaks, viz 4I9/2→2P1/2, 4I9/2→4G11/2,4I9/2→2G9/2,4I9/2→4G9/2,4I9/2→4G7/2, 4I9/2→2G7/2,4I9/2→4F9/2, 4I9/2→4S3/2, 4I9/2→4F7/2 , 4I9/2→4F5/2, and 4I9/2→4F3/2 transitions of Nd(III) have been observed . Various spectroscopic parameters viz- Interaction Parameters viz: Slater- Condon F2, F4,& F6 and Lande parameter or Spin-Orbit Coupling Constant (ζ4f, Racah Parameters or Energy parameters (E1, E2 and E3):Bonding parameters : Nephelauxetic ratio (β), Bonding(b1/2), Sinha Covalency (δ%) and Covalency-Angular Overlap (η) have been computed using partial and multiple regression methods and evaluated by expressing energy as Taylor series. This work describes investigations on Nd (III)-2-amino benzothiazole system. Effect of codoped viz. Ca+2,Mg+2,Sr+2 metal ions have been analyzed and it has been observed that degree of covalency have been raised in presence of Ca+2,Mg+2,Sr+2 metal ions.