Structural characterization of some adducts of the form [M2(µ-dppm)2(MeCN)x]X2 [M = Cu, Ag; X = ClO4, BF4, PF6; dppm = (Ph2P)2CH2; x = 0–4]

© 2016 Elsevier B.V.Structural characterizations are reported for a number of adducts of the form [M2(µ-dppm)2(MeCN)x]X2 (M = univalent Cu, Ag; X = ClO4, BF4, PF6; dppm = Ph2PCH2 PPh2; x = 0–4) for (a) M = Cu, X = BF4, x = 4 (1), 3 (2); (b) M = Ag, x = 2, X = BF4 (3), X2 = PF6, PO2 F2 (4). Within derivatives 1 and 2, we find four- and three-coordinate copper atoms within the one species, with two and one acetonitrile molecules being coordinated, respectively; in 3 and 4, significant bridging interactions between the BF4 and PO2 F2 anions, and the silver atoms of the dimer respectively, are found. Electrospray-ionisation mass spectral studies of 2 and 4 in MeCN solution show that MeCN is only weakly bonded to the M2(dppm)2 core, the ions of major intensity being [Cu2(dppm)2(BF4)]+ and overlapping [Cu2(dppm)2]2+/[Cu(dppm)]+ for 2, and [Ag(dppm)2(PO2 F2)]+ and [Ag2(dppm)2]2+ for 4.