
TY  - JOUR
A1  - Figgis, BN 
A1  - Kucharski, ES 
A1  - Mitra, S 
A1  - Skelton, BW 
A1  - White, AH 
T1  - Crystal Structure of Two Different Hydrate Phases of Bis[2,4,6-tri(2-pyridyl)-1,3,5-triazine]cobalt(II) Diiodide
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1990
VL  - 43
IS  - 7
SP  - 1269
EP  - 1276
KW  - 
UR  - https://doi.org/10.1071/CH9901269 
N2  - The title compound crystallizes at room temperature from aqueous solution as two distinct hydrated phases, both monoclinic and characterized by single-crystal X-ray structure determinations. The dihydrate ('blocks') is C2/c, a 42.58(2), b 9.099(8), c 21.14(1)&#506;, &#946; 112.12(4)&#176;, Z= 8; R was 0.048 for 3784 'observed' reflections. The c. 3.75 hydrate ('Tetrahydrate'?) ('needles') is P21/c, a 9.348(2), b 36.663(8), c 23.071(8)&#506;, &#946; 93.51(2)&#176;, Z 8; R was 0.050 for 6042 'observed' reflections. There are one and two independent cations in the asymmetric unit of each structure; all cations have the metal atom 'mer' coordinated by a pair of tridentate ligands. In the C2/c phase, Co-N (central) are 2.057(4) and 2.063(4)&#506; with N-Co-N 175.8(2)&#176;; Co-N (distal) are 2.163(6)-2.187(6)&#506;. In the P21/c phase, in the first cation, Co-N are 2.045(8) and 2.050(7)&#506; (central) [with N-Co-N, 167.0(3)&#176;] and 2.193(8)-2.216(8)&#506; (distal), while, in the second, Co-N (central) are 2.030(8) and 2.042(8)&#506; with N-Co-N, 168.3(3)&#176;; Co-N (distal) are 2.164(8)-2.227(8)&#506;. These Co-N distances are longer than those observed in the [Co( tpy )2]2+ cations hitherto studied ( tpy = 2,2&#8242;:6&#8242;,2&#8242;-terpyridine), in which the electronic ground state has an appreciable low-spin component. 
ER  -

