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Benzeneselenolates of Mercury(II). Crystal and Molecular Structures of [Hg(SePh)2] and (Bu4N)[Hg(SePh)3]

✍ Scribed by Ernesto Schulz Lang; Marcelo Müller Dias; Ulrich Abram; Ezequiel M. Vázquez-López


Publisher
John Wiley and Sons
Year
2000
Tongue
German
Weight
133 KB
Volume
626
Category
Article
ISSN
0372-7874

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✦ Synopsis


The reaction of dibenzenediselenide, (SePh) 2 , with mercury in refluxing xylene gives bis(benzeneselenolato)mercury(II), [Hg(SePh) 2 ], in a good yield. ( n Bu 4 N)[Hg(SePh) 3 ] is obtained by the reaction of [Hg(SePh) 2 ] with a solution of [SePh] ± and ( n Bu 4 N)Br in ethanol. The solid state structures of both compounds have been determined by X-ray diffraction. The mercury atom in [Hg(SePh) 2 ] (space group C2, a = 7.428(2), b = 5.670(1), c = 14.796(4) A Ê , b = 103.60(1)°) is linearly co-ordinated by two selenium atoms (Hg±Se = 2.471(2) A Ê , Se±Hg±Se = 178.0(3)°). Additional weak interactions between the metal and selenium atoms of neighbouring molecules (Hg ´´´Se = 3.4±3.6 A Ê ) associate the [Hg(SePh) 2 ] units to layers. The crystal structure of ( n Bu 4 N)[Hg(SePh) 3 ] (space group P2 1 /c, a = 9.741(1), b = 17.334(1), c = 21.785(1) A Ê , b = 95.27( 5)°) consists of discrete complex anions and ( n Bu 4 N) + counter ions. The coordination geometry of mercury is distorted trigonal-planar with Hg±Se distances ranging between 2.5 and 2.6 A Ê .


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