| | 1 | Author
| Volker Lorenz3, Bernhard Neumiillerb, Karl-Heinz Thiele3 | Requires cookie* | | | Title
| Synthese und Kristallstrukturen von Diazadien-Komplexen der Erdalkalimetalle Syntheses and Crystal Structures of Diazadiene Complexes of the Alkaline Earth Metals  | | | | Abstract
| [C aN R -CPh=CPh-N R (D M E)2] 1 (R = C6H4-4 -C H 3; D M E = dim ethoxyethane) was pre pared by reaction of calcium with N R = C P h -C P h = N R in D M E solution. The compound forms orange, moisture sensitive crystals, which were characterized by an X-ray structure determination [space group orthorhombic, P 2 i2 12 1, Z = 4, 4634 observed unique reflections, R = 0.046; lattice dimensions at -7 0 °C: a = 1340.2(3), b = 1528.1(3), c = 1609.1(3) pm]. The calcium atom is coordinated by the four oxygen atoms of two chelating D M E molecules and two nitrogen atoms of the diazadiene ligand, bonded in its enediam ide form. [Ba2(D M E)3(N P h -C P h = C P h -N P h)2 DM E] 3 was obtained from barium metal and N Ph=C Ph-C Ph=N Ph in D M E solution as red crystals [space group monoclinic, P2!/c, Z = 4, 4000 observed unique reflections, R = 0.166; lattice dim ensions at -7 0 °C: a = 1704.5(3), b = 1786.1(4), c = 2177.4(4) pm, ß = 105.98(3)°]. The two barium atoms are bridged by two differently bonded diazadiene ligands (/<2-N ,N ';/i-N ,a -N '). Additionally, one of the barium atoms is coordinated to two DM E m olecules and the other one to only one of the ether molecules. A further DM E molecule is a constituent of the crystal lattice. | | | |
Reference
| (Z. Naturforsch. 50b, 71—7 [1995]; eingegangen am 13. Juli 1994) | | | |
Published
| 1995 | | | |
Keywords
| Alkaline Earth Metal Complexes, Diazadiene Ligands, Enediamide Structure, X-Ray | | | |
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| ZNB-1995-50b-0071 | | | | Volume
| 50 | |
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