The Schiff base organotin(IV) complex {[4-Et_2NC_6H_3(O)C=NC_6H_3(O)-5-NO_2](n-Bu_2Sn)}_2 has been synthesized via the reaction between 4-(diethylamino) salicylaldehyde-2-amino-4-nitrophenol Schiff base (H_2L) and dibutyltin oxide. Complex C1 has been characterized by IR, ~1H NMR, ~(13)C NMR spectra, and elemental analysis, and its crystal structure was determined by X-ray diffraction. It crystallizes in the monoclinic system, space group P2_(1/n) with a = 15.6559(8), b = 9.1657(5), c = 18.8351(10) A, β = 107.3440(10)°, Z = 4, V = 2579.9(2) A...