请教一道化学sub题

AshangUID: 2250940

Which of the following species has a magnetic moment?
(A) [Zn(NH3)4]2+
(B) [Co(NH3)6]3+
(C) TiF4
(D) [PdCl4]2-
(E) [Cr(NH3)6]3+

我觉得D和E都对，答案给的是E,为什么？

jiangsanfengUID: 2259035

D Pd是第5周期的，所以四个氯原子采取正方形排布，晶体场分裂能很大，所以采取低自旋，8个d电子正好成对，是反磁性的
E 6个配体成8面体场 Cr(III)有两个d电子，肯定是分别排在两个轨道里，所以是顺磁性的啊

AshangUID: 2250940

Thank you!

AshangUID: 2250940

Theoretically there should be no pure rotational spectrum in the microwave region for CH4 because the
(A) rotational transitions for this molecule lie in the infrared region of the spectrum.
(B) molecule contains no multiple bonds.
(C) molecule has no permanent dipole moment.
(D) separation between successive rotational energy levels is too small for rotational tra nsitions to be observed in the microwave region.
(E) vibrational transitions in this wavelength region obscure the rotational transitions.

请化学高手帮忙啊！

chuanweizuoUID: 2189837

c
看结构化学里面讲转动光谱的选律的时候会提到，首要条件就是要求要永久偶极矩

monica98UID: 2124796

E 是3个d电子,分别3个轨道