Add time:08/02/2019         Source:sciencedirect.com

The thermal reactions of ReH7(dppe) (dppe = Ph2PCH2CH2PPh2) with pyridine-2-carboxylic acid (Hpic), 1-isoquinolinecarboxylic acid (Hisoquin), 2-hydroxy-6-methylpyridine (Hmhp) and 2-mercaptoquinoline (Hmq) in refluxing benzene afforded the monohydridorhenium(III) species ReH(L)2(dppe) [L = pic (1a), isoquin (1b), mhp (1c), mq (1d)]. While analogous complexes have been prepared previously from ReH7(PPh3)2 in the case of L = pic, isoquin and mhp, the reactions between ReH7(PPh3)2 and the ligands 2-hydroxyquinoline and 2-mercaptoquinoline are dependent on the choice of reaction solvent; the rhenium hydride complexes ReH4(L)(PPh3)2 (L = hq or mq) and ReH(hq)2 (PPh3)2 have been isolated in a pure state. 1H and 31P NMR spectral measurements on the seven-coordinate species 1a-d show that these compounds are stereochemically rigid at room temperature. The solution structures are in accord with the solid state structures of 1c and 1d, as determined by X-ray crystallography. Copyright © 1996 Elsevier Science Ltd

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