
Zeitschrift fur Anorganische und Allgemeine Chemie p. 2470 - 2477 (2002)
Update date:2022-08-05
Topics:
Leschke
Rheinwald
Lang
The reaction of [P(C6H4CH2NMe2-2)3]AgX (1a, X = OTf; 1b, X = OClO3) with equimolar amounts of L∩L (2a, L∩L = 2,2′-bipyridine, bipy; 2b, L∩L = 4,4′-dimethyl-2,2′-bipyridine, bipy′; 2c, L∩L = 1,10-phenanthroline, phen) leads to the formation of the cationic complexes {[P(C6H4CH2NMe2-2)3] Ag(L∩L)}+X- (L∩L = bipy: 3a, X = OTf; 3b, X = ClO4; L∩L = bipy′: 3c, X = OTf; 3d, X = ClO4; L∩L = phen: 3e, X = OTf; 3f, X = ClO4) in which the building blocks L∩L and P(C6H4CH2NMe2-2)3 act as bidentate chelating ligands and are datively-bound to the silver atom. Spectroscopic studies reveal that on the NMR time-scale the phosphane group is dynamic with exchanging the respective Me2NCH2 built-in arms. While complex 3e is stable in the solid-state, it appeared that solutions of 3e start to decompose upon precipitation of colloidal silver when they are heated or irradiated with light, respectively. Appropriate work-up of the reaction mixture allows the isolation of the phosphane P(C6H4CH2NMe2-2)3 (5) along with [Ag(phen)2]OTf (4). The solid-state structures of neutral 1a and cationic 4 are reported. Mononuclear 1a crystallizes in the monoclinic space group P21/c with the cell parameters a = 16.7763(2), b = 14.7892(2), c = 25.44130(10) A, β = 106.1260(10), V = 6063.83(11) A3 and Z:= 4 with 8132 observed unique reflections (R1 - 0.0712), while 4 crystallizes in the monoclinic space group C2/c with the cell parameters a = 26.749(3), b = 7.1550(10), c = 26.077(3) A, β = 113.503(2), V = 4576.8(10) A3 and Z = 4 with 6209 observed unique reflections (R1 = 0.0481). The unit cell of 1a consists of two independent molecules. In both molecules the silver atom possesses a distorted tetrahedral coordination sphere and a boat-like conformation for the six-membered AgPNCH2C2/phenyl cycles is found. In 4, as typical for 1a, the silver atom possesses the coordination number 4. The two phen ligands are tilted by 40.63°. The OTf group is acting as non-coordinating counter ion.
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