
TY  - JOUR
A1  - Fuller, DJ 
A1  - Kepert, DL 
A1  - Skelton, BW 
A1  - White, AH 
T1  - Structure, Stereochemistry and Novel 'Hydrogen Bonding' in Two Bipyridinium Salts of the B<sub>10</sub>H<sub>10</sub><sup>2-</sup> Anion
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1987
VL  - 40
IS  - 12
SP  - 2097
EP  - 2105
KW  - 
UR  - https://doi.org/10.1071/CH9872097 
N2  - Crystal structure determinations of (LH)2(B10H10), (1), and (LH2)(B10H10), (2), L = 2,2'- bipyridine , have been carried out by single-crystal X-ray diffraction methods at 295 K, being refined by full-matrix least squares to residuals of 0.041, 0.047 for 1758, 1771 'observed' independent reflections respectively. Crystals of (1) are monoclinic, P21/n, a 12.040(7), b 17.71(1), c 11.142(4) Å, &#946; 101.78(4)º, Z 4. Crystals of (2) are monoclinic, P21/c, a 9.937(4), b 10.837(3), c 14.856(5) Å, &#946; 109 2l(3)º, Z 4. The colour of the compounds is accounted for by charge-transfer interactions of a novel type, namely between the positively charged cationic acid hydrogen atoms and the negatively charged non-apical hydrogen atoms of the anion. In yellow (1), these distances are 2.26(5) Å, while in red (2), they are much shorter, being 1.89(4), 1.97(3) Å. 
ER  -

