A new heterotopic Ar-BIAN ligand with a pendant P donor site

Szalontai, Gábor and Szabó, Pál Tamás and Besenyei, Gábor (2015) A new heterotopic Ar-BIAN ligand with a pendant P donor site. POLYHEDRON, 92. pp. 156-165. ISSN 0277-5387

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Abstract The heterotopic ligand 1-[4-(4-diphenylphosphanylphenyl)phenylimino]-2-[3,5-bis(trifluoromethyl)phenylimino]acenaphthene, PN2, was prepared and characterized by NMR spectroscopic and MS methods. Depending on the size and the electronic properties of the metal reagent M, the two binding sites of the new ligand show selective coordination. At 1:1 molar ratio of PN2 and M, the sterically more demanding [Pd(dppe)]2+ and [Pd(dppp)]2+ cations coordinate only to the chelating nitrogen atoms while the less bulky [Pd(dppm)]2+ binds both to the imino and the phosphane donor groups. A 2:1:2 mixture of PN2, [Pd(dppm)(OTf)2] and [Pd(dppe)(OTf)2] results in the formation of a complex in which the [Pd(dppm)]2+ unit selectively coordinates to the terminal P atoms while the more voluminous dppe counterpart resides at the imino nitrogens. On the contrary, the [Pd(dppm)]2+ complex selectively binds to the chelating nitrogen atoms if the Ph2P group is ligated to Au+ center. In the interaction of [Au(PN2)2]PF6 with Ag(OTf), the silver ions do not replace Au+ in the P–Au bonds but occupy the chelating position.

Item Type: Article
Uncontrolled Keywords: Steric effects; NMR spectroscopy; Directed coordination; Heterotopic ligand; Ar-BIAN
Subjects: Q Science / természettudomány > QD Chemistry / kémia > QD04 Organic chemistry / szerves kémia
Depositing User: MTMT SWORD
Date Deposited: 13 Jun 2016 14:37
Last Modified: 13 Jun 2016 14:37

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