
TY  - JOUR
A1  - Henrick, K 
A1  - Raston, CL 
A1  - White, AH 
A1  - Wild, SB 
T1  - Crystal structures of <I>rac</I>- and <I>meso-o-</I>Phenylenebis(iodomethylarsine), the latter as its lattice complex with the methiodide of 1,3-Dimethyl-1,3-dihydro-2,1,3-benzoxadiarsole
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1977
VL  - 30
IS  - 11
SP  - 2417
EP  - 2423
KW  - 
UR  - https://doi.org/10.1071/CH9772417 
N2  - The crystal structures of the title compounds, o-C6H4(AsMeI)2 (1), and o- C6H4(AsMeI)2- [o-C6H4(AsMe)(As+Me2)O] I- (2), have been determined at 295 K by single-crystal X-ray diffraction and refined by least squares to residuals of 0.037 and 0.067 for 2095 and 2913 reflections respectively. Crystals of (1) are triclinic, P&#299;, a 9.865(5), b 9.837(7), c 7.765(4) &#506;, &#945; 98.89(5), &#946; 96.71(4), &#947; 60.72(4)°, Z 2. <As- I> is 2.585 &#506; and <As-C> 1.97 &#506;. The angles about the arsenic differ only trivially, the mean being 98.4°. Crystals of (2) are monoclinic, P21/n, a 15.315(4), b 21.511(8), c 7.952(2) &#506;, &#946; 98.19(2)°, Z 4. In the cation As-O distances are unequal [1.75(1) (quaternary As), 1.86(2) &#506;]; As-O-As is very small being 115.8(8)°. Charge-transfer interactions between iodine species are present in both derivatives; in (2), there is an interaction between the tertiary arsenics of the meso molecule and the iodide anion, As...I being 3.307(3), 3.551(3) &#506;, with the geometry of the arsenics approaching that of a tetrahedral disposition. Within the cation, the geometry about the quaternary arsenic is typical of arsenic(v), the bond lengths being shorter than those about the ternary arsenic. 
ER  -

