5788-47-6Relevant articles and documents
Novel pyridazine based scorpionate ligands in cobalt and nickel boratrane compounds
Nuss, Gernot,Saischek, Gerald,Harum, Bastian N.,Volpe, Manuel,Gatterer, Karl,Belaj, Ferdinand,Moesch-Zanetti, Nadia C.
, p. 1991 - 2001 (2011)
Heating of 6-methylpyridazine-3-thione (HPnMe) and 6-tert-butylpyridazine-3-thione (HPntBu) with potassium borohydride in diphenylmethane in a 3:1 ratio gave two new scorpionate ligands K[HB(Pn Me)3] and K[HB(PntBu)3]. Single crystal X-ray diffraction analysis of the methyl derivative K[HB(Pn Me)3] revealed a dimeric species with one potassium atom coordinated by six sulfur atoms of two scorpionate ligands and a second potassium atom coordinated by three nitrogen atoms of one of the two ligands as well as by three water molecules. The reaction of K[HB(PntBu) 3] with nickel(II) chloride or cobalt(II) chloride in CH 2Cl2 led to the new boratrane compounds [M{B(Pn tBu)3}Cl] (M = Ni 1, Co 3) where a formal reduction of the metal ions to Ni(I) and Co(I), respectively, and activation of the B-H bond occurred. Similar reactivity was observed by employing K[HB(PnR) 3] (R = Me, tBu) and nickel(II) chloride in water. Reaction with cobalt(II) chloride in water also gave boratrane compounds [Co{B(Pn R)3}(PnR)] (R = tBu 4, Ph 5), but instead of a chloride a bidentate pyridazinethionate ligand from a defragmentated scorpionate is found in the molecules. The molecular structures of all nickel and cobalt compounds were determined by single crystal X-ray diffraction analyses confirming the formation of boratranes in compounds 1-5. Magnetic measurements confirm the reduced oxidation states and the paramagnetic character of the Ni(I) and Co(I) complexes. Supportive DFT studies were carried out for a better understanding of the electronic nature of the metal-boron bond of the boratrane complexes.
Studies of heterocyclic compounds. IX. The synthesis and the properties of thiazolo[3,2-b]pyridazin-4-ium perchlorates
Arakawa,Miyasaka,Satoh
, p. 299 - 306 (2007/10/07)
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