
TY  - JOUR
A1  - Lay, PA 
A1  - Mclaughlin, GM 
A1  - Sargeson, AM 
T1  - Crystal and Molecular Structure of Tris(Ethane-1,2-Diamine)Osmium(III) Trifluoromethanesulfonate Monohydrate
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1987
VL  - 40
IS  - 7
SP  - 1267
EP  - 1276
KW  - 
UR  - https://doi.org/10.1071/CH9871267 
N2  - The crystal and molecular structure of racemic [Os(en)3] (CF3SO3)3.H2O has been determined. The [Os(en)3]3+ ion adopts a le &#958;ob  configuration and has approximate C2 symmetry with an Os-N(av.) bond length of 2.11 Å and a bite angle for the chelate of - 82º. The previously recorded structure of the [Os(en-H)2(en)]2+ ion in which two deprotonated ethane-1,2-diamine ligands adoptoa cis configuration of the two amido donors, and in which the OsIV -N( amido ) bonds (1.90 Å) are much shorter than the Os-N(amine) bonds, 2.11 ( cis ), 2.19 (trans), along with the present structure indicates a bond order > 1 for the osmiumo amido bond. The normal Os-N bond lengths fall into well defined ranges OS-NR3 (2.11-2.14 Å), Os=NR2- (~1.90 Å),Os=NR2 (- 1.70 Å) and Os=N3-(- 1.58-1.63 Å). These single bond lengths are more affected by trans effects than the formal oxidation state of the osmium centre. 
ER  -

