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Crystal Structures of the 1:1 Adducts of <i>N,N,N′,N′</i> - Tetramethyl-o-phenylenediamine with Zinc(II) Bromide and Mercury(II) Bromide and Iodide
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1985
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The 1:1 adducts of o-Me2N.C6H4.NMe2 (= L") with ZnI2, HgBr2 and HgI2 are isomorphous and their crystal structures have been established by single-crystal X-ray diffraction methods, being refined to residuals of 0.045, 0.050, 0.035, for 1759, 1617, 1911 'observed' reflections respectively. Crystals are monoclinic P21/c,Z = 4, with a ~ 8.5, b ~ 21, c ~ 8 ?, ß ~ 95°. In L"ZnI2, {Zn-I} is 2.538, {Zn-N} 2.09 ?, with I-Zn-I 115.36(6), N-Zn-N 84.6(3), and I-Zn-N 108.3(2)-118.3(2)°. In L"HgBr2, (Hg-Br) is 2.523, {Hg-N} 2.42 ?, with Br-Hg-Br 123.04(8), N-Hg-N 73.2(4) and Br-Hg-N 98.9(3)-131.2(3)°. In L"HgI2, {Hg-I} is 2.661, {Hg-N} 2.44 ?, with I-Hg-I 128.92 (3), N-Hg-N 72.8(3), and I-Hg-N 101.8(2)- 122.9(2). X-Hg-X angles are unexpectedly small and this is attributed to incipient dimer formation through an inversion centre, this tendency being greatest in (2) where the Hg…Br approach is 3.456(3) ? and the immediate HgBr2N environment of the mercury is trigonal planar.