Dianion and monoanion ligation of 1,4-diaza-1,3-butadiene to barium, strontium, and calcium

Panda, Tarun K and Kaneko, H and Michel, O and Pal, K and Tsurugi, H and Tornroos, K W and Anwander, R and Mashima, K (2012) Dianion and monoanion ligation of 1,4-diaza-1,3-butadiene to barium, strontium, and calcium. Organometallics, 31 (8). pp. 3178-3184. ISSN 0276-7333

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Two synthetic protocols, a salt metathesis reaction and a direct metalation, were developed for preparing 1,4-diaza-1,3-butadiene complexes of barium, strontium, and calcium, in which 1,4-diaza-1,3-butadiene serves as a dianionic or monoanionic ligand. A salt metathesis reaction of BaI 2 with the dipotassium salt of N,N′-bis(2,6-diisopropylphenyl)-1,4-diaza-1, 3-butadiene (1; abbreviated (Dip) 2DAD) afforded the iodide-bridged dinuclear complex [[K((Dip) 2DAD)(THF) 2][Ba(ν-I)(THF) 2]] 2 (2) bearing a dianionic ene-diamide ligand, while the reaction of MI 2 (M = Sr, Ca) with the dipotassium salt of 1 gave the mononuclear complexes [M((Dip) 2DAD)[THF] 4] (4, M = Sr; 5, M = Ca). A direct metalation reaction of barium powder with (Dip) 2DAD in the presence of iodine (10 mol%) afforded an iodide-bridged dinuclear complex, [Ba((Dip) 2DAD)(ν-I)(THF) 2] 2 (3), in which (Dip) 2DAD coordinates as a monoanionic ligand to the barium center, as was evident from the X-ray analysis and the EPR spectral data. The products from the direct metalation reaction of Sr and Ca powders with 1 in the presence of a catalytic amount of iodine (1 mol%) resulted in the formation of mononuclear complexes 4 and 5 bearing the dianionic ene-diamide DAD ligand

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IITH Creators:
IITH CreatorsORCiD
Panda, Tarun Khttp://orcid.org/0000-0003-0975-0118
Item Type: Article
Uncontrolled Keywords: Catalytic amounts; Dianions; Dinuclear complex; EPR spectral; Metalation reaction; Metalations; Monoanions; Mononuclear complexes; Salt metathesis; Synthetic protocols
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Team Library
Date Deposited: 14 Nov 2014 06:45
Last Modified: 07 Sep 2017 11:30
URI: http://raiith.iith.ac.in/id/eprint/774
Publisher URL: https://doi.org/10.1021/om300054h
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