Several compounds of the type Ph 3 Te[(XPR 2 )(YPR 2 )N] (R = Me, Ph; R = Me, Ph; Y = O, S) were obtained by metathesis reactions between Ph 3 TeCl and M[(XPR 2 )(YPR 2 )N]. Two of these, (tetraphenylmonothioimidodiphosphinato)triphenyltellurium(IV), Ph 3 Te-[(SPPh 2 )(OPPh 2 )N] (1) and (tetraphenylimidodiphosphinato)triphenyltellurium(IV), Ph 3 Te[(OPPh 2 ) 2 N] (2) were obtained by metathesis reactions between Ph 3 TeCl and K[(SPPh 2 )(OPPh 2 )N] or K[(OPPh 2 ) 2 N], respectively. The compounds were characterized by IR and multinuclear ( 1 H, 1 3 C and 3 1 P) NMR. The molecular structure of both compounds has been determined by X-ray diffractometry. Ph 3 Te[(SPPh 2 )(OPPh 2 )N] crystallizes in the monoclinic P2 1 /c space group (No. 14) and has the cell parameters a = 13.64(1), b = 13.88(1), c = 20.268(7) 9, β = 105.37(5)°, V = 3699(4) 9 3 and Z = 4, and Ph 3 Te[(OPPh 2 ) 2 N] crystallizes in the monoclinic C2/c space group (No. 15) and has the cell parameters a = 20.748(6), b = 13.824(5), c = 28.093(6) 9, β = 115.48(2)°, V = 7274(3) 9 3 and Z = 8. Both compounds are monomeric and the immediate environment about tellurium can be described as octahedral with the apparently stereochemically active lone pair occupying the axial position trans to a phenyl group from Ph 3 Te. The other two phenyl groups and two long tellurium-chalcogen secondary interactions [Te O 2.77(1) and Te S 3.282(4) in (1) and Te O(1) 2.926(6) and Te O(2) 2.654(6) 9 in (2), respectively] complete the equatorial plane around tellurium. As a result novel six-membered TeOSP 2 N and TeO 2 P 2 N inorganic chelate rings are formed. Five other compounds, Ph 3 Te[(SPPh 2 )(OPMe 2 )N], Ph 3 Te[(SPMe 2 )(OPPh 2 )N], Ph 3 Te[(OPMe 2 )(OPPh 2 )N], Ph 3 Te[(SPMe 2 ) 2 N] and Ph 3 Te[(SPMe 2 )(SPPh 2 )N], were identified unequivocally but unfortunately attempts to isolate them failed due to decomposition. The reaction mixtures were investigated by multinuclear ( 1 H, 1 3 C and 3 1 P) NMR spectroscopy.