Structure of 1,3-di-tert-butyl-2,2,4,4-tetraisopropylcyclodisilazane, C20H46N2Si2

The crystal structure of 2-chloro-1,3-bis(2,4,6-trimethylphenyl)-4,4-dimethyl-1,3,2λ3,4-diazaphosphasiletidine

“…The unusually acute N1-Si1-N2 angle in the title compound is associated with Si-N distances of 1.7436(17) Å (Si1-N1) and 1.7445(17) Å (Si1-N2). The latter are remarkably longer than the value reported for a Si-N single bond (1.724(4) Å [13]), but correspond to those in related cyclodisilazanes [14][15][16][17][18][19][20][21][22]. Consequently, the P-N bonds are shorter than expected for a single bond (1.6857(17) Å (P1-N1) and 1.6854(17) Å (P1-N2) vs. 1.704(4) Å [13]).…”

Bonding in silicon nitrides

“…Soc., Dalton Trans. 1982 [43][44] "Note that tr-Si3N4 can be considered as a framework of 6-membered rings and the ß form as a framework of 8-membered rings. silicon atoms bonded to trigonally coordinated nitrogen atoms.…”

Dianionic amidinates at silicon and germanium centers: Four-, six- and eight-membered rings

“…From the structure it is obvious that the two imide units are in anti conformation, indicating that not the syn compound s4b, but the anti a4b has been formed. There are no remarkable deviations from the respective data of known compounds of this type [9][10][11][12][13][14][15][16][17][18], whereby a common feature are the small N-Si-N and the larger Si-N-Si angles, although in a4b, these values lie at the low (83.9(1)°) and the high end (96.2(1)°) with a non-bonding Si. .…”