[slizza]

Hi

I have a question which I do not understand completely and hopefully someone can help me out on.  I have to draw a tetragonally elongated octahedron crystal field splitting diagram and use it to explain why 4 compounds which i made in labs are diamagnetic and paramagnetic with the magnetic moments indicating 2 unpaired electrons on the central atom of the complexes.


The compounds which i made were Ni(Et2en)2(NCS)2, Ni(Et2en)2Cl2,Ni(Et2en)2Br2 and Ni(Et2en)2I2.

Linked below is what i believe is the correct crystal field splitting diagram but how do i use it to explain why my compounds are dia- and para- magnetic?

Anyone with any knowledge to this topic please help me i would be very grateful. Thanks

[vex]

What is your rationale for drawing the second orbital splitting pattern the way you have? You start from the free ion and then proceed to the octahedral complex, both of which are correct. But what octahedral complex are you assuming and how are you lowering the symmetry?

[slizza]

This crystal field splitting diagram is an image i got from a journal showing the general structure for a diagram for a tetragonally elongated octahedron. The octahedral complexes I want to use this for are Ni(Et2en)2(NCS)2, Ni(Et2en)2Cl2, Ni(Et2en)2Br2 and Ni(Et2en)2I2

[vex]

Do you know whether your individual compounds are diamagnetic or paramagnetic and you're just trying to give a background explanation, or are you trying to determine it using this diagram?

[slizza]

i know which ones are dia- and para just need to to give background information on how i know. Ni(Et2en)2(NCS)2 and Ni(Et2en)2Cl2 are para, Ni(Et2en)2Br2 and Ni(Et2en)2I2 are dia.