
TY  - JOUR
A1  - Creaser, II 
A1  - Engelhardt, LM 
A1  - Harrowfield, JM 
A1  - Sargeson, AM 
A1  - Skelton, BW 
A1  - White, AH 
T1  - Syntheses and Structures of Manganese(II) and Manganese(III) Nitrate Diaminosarcophagine Complexes
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1993
VL  - 46
IS  - 4
SP  - 465
EP  - 476
KW  - 
UR  - https://doi.org/10.1071/CH9930465 
N2  - The syntheses of [ Mn ((NH3)2sar)](NO3)4.H2O and [ Mn ((NH3)2sar)](NO3)5.2H2O, manganese(II) and manganese(III) complexes of the cage amine ligand  diaminosarcophagine ( di-aminosarcophagine = (NH2)2sar = 1,8-diamino-3,6,10,13,16,19-hexaazabicyclo[6.6.6] icosane ) in its diprotonated form are recorded, together with their single-crystal X-ray structure determinations at c. 295 K. The monoclinic P21 array of the manganese(II) complex (a 12.386(5), b 12.431(4), c 8.598(4) &#506;, &#946; 93.89(4)&#176;, V 1321(1) &#506;3,Z 2) is archetypical for similar complexes of a wide variety of transition metals; for the present determination, R was 0.027 for 2013 'observed' (I > 3&#963;(I)) reflections. The manganese(III) complex is monoclinic C 2/c, a 10.744(2), b 13.294(4), c 20.462(9) &#506;, &#946; 102.38(3)&#176;, Z 4; R was 0.055 for 1629 'observed' reflections. Both structures show the six secondary nitrogen atoms of the ligand to be bound to the manganese ion in a configuration approximately halfway between a trigonal prism and an octahedron. The ligand is in the lel3 conformation. In the first complex, Mn -N distances, appropriate to high-spin manganese(II), range from 2.228(3) to 2.253(3) &#506;, mean 2.238 &#506;; in the second, surprisingly, the distances are even more closely ranged (unlike those of the sarcophagine analogue of the previous paper), 2.115(4)-2.127(4) &#506;, the mean (2.122 &#506;) being closely comparable to that recorded for the sar analogue, and show no appreciable variation attributable to the expected Jahn-Teller effect. 
ER  -

