钇与各种双烷基和双烯丙基配体Y(CH 2 SiMe 2 Ph)2(THF)4 ] [B(C 6 F 5)4 ],[Y(CH 2 C 6 H 4 NMe 2)的单阳离子络合物)2(THF)2 ] [B(C 6 F 5)4 ]和[Y [1,3-(SiMe 3)2 C 3 H 3 ] 2(THF)2 ] [B(C 6 F 5)4通过使用硼酸苯胺盐[PhNMe 2 H] [B(C 6 F 5)4 ]质子分解相应的均三烷基或-烯丙基配合物来制备[ ]。所得离子对络合物已通过不同技术进行了分离和表征,例如元素分析,1 H,13 C和89 Y NMR,以及烯丙基阳离子络合物[Y [1,3-(SiMe 3)2 C 3 H 3 ] 2(THF)2 ] [B(C 6 F 5)4 ]。更具体地说,是1为了量化合成的中性三-烷基和阳离子双-烷基钇配合物的金属/烷基配体化学计量,已经开发了H偶联的89 Y INEP
Prediction of 89Y NMR Chemical Shifts in Organometallic Complexes with Density Functional Theory
摘要:
Organometallic and coordination compounds containing yttrium are usefully characterized with Y-89 NMR spectroscopy (I = -(1)/(2), 100% nat. abund.). Even though the qualitative contributions of various ligand groups to the yttrium NMR chemical shift have been known for some time, attempts to predict the shifts quantitatively have been limited. In the present work, a variety of organoyttrium complexes containing cyclopentadienyl, alkyl, hydride, and aryloxide ligands have been optimized with density functional theory methods. The optimized structures were used with the gauge-including atomic orbital (GIAO) method to calculate the corresponding 89Y NMR magnetic shielding values (sigma(calc)); the latter were linearly scaled to adjust the fit with observed chemical shifts. Agreement between predicted and experimental Y-89 NMR shifts is typically within +/- 70 ppm (similar to 5% of the ca. 1300 ppm shift range). Y-89 NMR calculations were used to provide supporting evidence for the existence of the bulky triallyl complex Y[1,3-(SiMe3)(2)C3H3](3).