Structural characteristics have been studied for phosphoramides [1] and thiophosphoramides [2]. These compounds have been attracted attention due to their biological activity and flame retardancy properties [3,4]. In this research, we report the syntheses of (EtO)2P(S)[NH(CH2) 4NH]P(S)(OEt) 2 (I), and (EtO) 2P(S)[trans-1-(NH)C6H10 -4-(NH)]P(S)(OEt) 2 (II), belonging to bisphosphoramidothioate family, and the characterization by IR, NMR ( 1H, 13 C, and 31P), elemental analysis, and Mass spectroscopy. In the Mass spectra, the molecular ion peaks are revealed (m/z = 392 for (I) and 418 for (II)). The phosphorus signals for (I) and (II) appear at 71.68 and 70.33 ppm, respectively. The N—H proton of (I) appears as a singlet at 3.07 ppm, and a similar proton of (II) appears at 3.02. In the IR spectra, the bands centered at 3304 cm–1 for (I) and at 3310 cm–1 for (II) are attributed to the NH stretching frequencies, and the P=S stretching bands appear at 790 and 787 cm–1 , respectively.

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