Bis(1°-amino)cyclodiphosph(III)azanes and bis(1°-amino)cyclodiphosph(V)azanes show different coordination preferences with titanium(IV). The bis(tert-butylamino)cyclodiphosph(III)azane cis-[But(H)N(ButNP)2N(H)But] (1) reacts with TiCl4 to afford [(ButNP)2(NBut)2]TiCl2} (2), in which the ligand chelates the metal as a diamide, above the heterocycle. Oxidations of 1 with phenyl- or p-tolyl azide yield the cyclodiphosph(V)azanes cis-[But(H)N(ArNPNBut)2N(H)But] (Ar = phenyl (3), p-tolyl (4)). Single-crystal X-ray studies of 3 and 4 reveal structures similar to those of their parent cyclodiphosph(III)azanes, but with pendent arylimino groups attached to the phosphorus(V) atoms. When 3 and 4 are allowed to react with TiCl4 the complexes [But(H)N(ArNPNBut)2NBut]TiCl3} (Ar = phenyl (5), p-tolyl (6)) are isolated. In these compounds the cyclodiphosph(V)azanes coordinate the metal laterally as monoanionic N–P–N ligands, similar to phosphoranates. An analogous side-on coordination is also found for the dichalcogeno complexes [But(H)N(EPNBut)2NBut]TiCl3} (E = S (9), Se (10)).
双(1°-
氨基)环二
磷(III)氮烷和双(1°-
氨基)环二
磷(V)氮烷与
钛(IV)显示出不同的配位偏好。双(叔丁基
氨基)环二
磷(III)氮烷顺式-[But(H)N(ButNP)2N(H)But](1)与 TiCl4 反应生成[(ButNP)2(NBut)2]TiCl2}(2),其中
配体以二元酰胺的形式在杂环上方螯合
金属。1 与苯基或
对甲苯基叠氮化物发生氧化反应,生成顺式-[But(H)N(ArN
PNBut)2N(H)But]环二
磷(V)氮杂环(Ar=苯基(3),
对甲苯基(4))。对 3 和 4 的单晶 X 射线研究表明,它们的结构与母体环二
磷(III)氮杂环烷的结构相似,但
磷(V)原子上附有下垂的芳基亚
氨基。当 3 和 4 与 TiCl4 反应时,分离出[But(H)N(ArN
PNBut)2NBut]TiCl3}复合物(Ar =苯基(5),
对甲苯基(6))。在这些化合物中,环二
磷(V)氮杂环作为单阴离子 N-P-N
配体横向配位
金属,类似于
磷酸盐。在[But(H)N(E
PNBut)2NBut]TiCl3}(E = S (9),Se (10))二
钙原络合物中也发现了类似的侧面配位。