[shafaifer]

Attachment:

19:25: The solid state of [Y{N(SiMe₃₂}₃] possesses trigonal pyramidal metals centres (N-Y-N_angle=115 degrees) - it's likely that the deviation from planarity is caused by crystal packing.

How can you justify deviations from the trigonal planar structure which is regarded to the two other 3-coordinate complexes? Has it to do with the distorting effect of a chelate ring / steric and electronic factors?

[Irlanur]

Has it to do with the distorting effect of a chelate ring / steric and electronic factors?

yes, but that's very vague.

[shafaifer]

Nevertheless, than you very much.

[kriggy]

My answer would be that in the 1st compound the two Si substituents are quite large and they repulse each other. In the 2nd compound its because the 1,10-phenantroline is quite rigid - the coordinating nitrogens has fixed positions. The last one is tricky but I suppose that Ytrium has lone electron pair that distorts the gemetry?

[shafaifer]

Thank you.