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Diorganodiselenides and zinc(ii) organoselenolates containing (imino)aryl groups of type 2-(RNCH)C6H4†‡
Alpar Pöllnitz,Cristian Silvestru,Jean-François Carpentier,Anca Silvestru
Dalton Transactions Pub Date : 02/10/2012 00:00:00 , DOI:10.1039/C2DT30098B
Abstract

Several new diorganodiselenides containing (imino)aryl groups, [2-(RN[double bond, length as m-dash]CH)C6H4]2Se2 [R = Me2NCH2CH2 (4), O(CH2CH2)2NCH2CH2 (5), PhCH2 (6), 2′,6′-iPr2C6H3 (7)] were obtained by reacting [2-{(O)CH}C6H4]2Se2 (3) with RNH2. Treatment of the diselenides 6 and 7 with stoichiometric amounts of K-selectride or Na resulted in isolation of the selenolates K[SeC6H4(CH[double bond, length as m-dash]NCH2Ph)-2] (9) and Na[SeC6H4(CH[double bond, length as m-dash]NC6H3iPr2-2′,6′)-2] (10), respectively. The reaction of potassium selenolates with anhydrous ZnCl2 (2 : 1 molar ratio) gave Zn[SeC6H4(CH[double bond, length as m-dash]NCH2Ph)-2]2 (11) and Zn[SeC6H4(CH[double bond, length as m-dash]NC6H3iPr2-2′,6′)-2]2 (12). When the dark green solution obtained from diselenide 7 and an excess of Na (after removal of the unreacted metal) was reacted with anhydrous ZnCl2 a carbon–carbon coupling reaction occurred and the 9,10-(2′,6′-iPr2C6H3NH)2C14H10 (8) species was obtained. The compounds were investigated in solution by multinuclear NMR (1H, 13C, 77Se, including 2D and variable temperature experiments) and by mass spectrometry. The molecular structures of 6, 8, 11 and 12 were established by single-crystal X-ray diffraction. All compounds are monomeric in the solid state. In the diselenide 6 the (imino)aryl group acts as a (C,N)-ligand resulting in a distorted T-shaped coordination geometry of type (C,N)SeX (X = Se). For the zinc complexes 11 and 12 the (Se,N) chelate pattern of the selenolato ligands results in tetrahedral Zn(Se,N)2 cores.

Graphical abstract: Diorganodiselenides and zinc(ii) organoselenolates containing (imino)aryl groups of type 2-(RN [[double bond, length as m-dash]] CH)C6H4
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