- Reactions of tris(2-pyridyl)phosphine oxides with electrophiles: Formation of 5-substituted 2, 2′-bipyridyls
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The reaction of tris (2-pyridyl)phosphine oxides with benzeneselenenyl chloride in methanol gave the corresponding 5-phenylseleno-2, 2′-bipyridyls together with a small amount of 2, 2′-bipyridyls. Similarly, the reaction with arenesulfenyl chlorides in aqueous acetonitrile afforded two kinds of coupling products, 5-phenylthio-2, 2′-bipyridyls and 2, 2′-bipyridyls. While in the reaction with arenesulfinyl chlorides in aqueous acetonitrile, four corresponding bipyridyl derivatives, 2, 2′-bipyridyls, 5-aryhhio-2, 2′-bipyridyls, 5-arylsulfinyl-2, 2′-bipyridyls, and 5-arylsulfonyl-2, 2′-bipyridyls, were formed.
- Uchida, Yuzuru,Matsumoto, Masami,Kawamura, Haruyasu
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- Spectrofluorometric method and compounds that are of value for the method
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A chelate formed between Eu3+, Tb3+, Dy3+ and Sm3+ and a compound having the formula STR1 where A1-6 are single carbon or nitrogen atoms; n=1 or 2; R1-6 is nothing when A is a nitrogen, and hydrogen or an organic group when A is a carbon; Z and Z' are selected among --N(CH2 CH2 COO-)2, --N(CH2 COO-)2, --N(CH2 OPO32-)2 and --N(CH2 PO32-)2 ;--species that --X--Y is a substituent replacing a hydrogen anywhere in the parent compound; and --X--Y represents an organic group containing no chelating heteroatom closer than four atoms from a chelating heteroatom in the parent compound and X is a stable bridge containing certain groups and Y is selected from (a) specified relative groups allowing coupling to other compounds and (b) residues of compounds participating in biospecific affinity reactions.
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- New 2,2'-Bipyridine Derivatives and Their Luminescence Properties with Europium(III) and Terbium(III) Ions
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Twenty differently substituted 2,2',2",2"'-III and TbIII ions.The relative luminescence yields, excitation maxima, and emission decay constants were determined for the corresponding EuIII and TbIII chelates.The substituents at the bipyridine moiety had a significant effect on the luminescence properties: the best relative luminescence yields R were obtained for ligands with electron-donating substituents (e.g.Me, Ph), electron-withdrawing substituents (e.g.NO2, COOH) had a reverse effect.However, no clear correlation between the relative luminescence yields and the substituent parameters was found.
- Mukkala, Veli-Matti,Kankare, Jouko J.
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p. 1578 - 1592
(2007/10/02)
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