Acta Crystallographica Section C

Structural Chemistry

Volume 70, Part 4 (April 2014)

metal-organic compounds

fg3317 scheme

Acta Cryst. (2014). C70, 379-383    [ doi:10.1107/S2053229614005725 ]

Counter-anion role in the formation of two supra­molecular complexes: [Ag2(DPP)2](ClO4)2·CH3CN and [Ag2(DPP)2(NO3)2] {DPP is N-[(di­phenyl­phosphanyl)methyl]pyridin-4-amine}

G.-M. Liang, J. Shang, K.-G. Yang, K. Ma and Q.-L. Ni

Abstract: The title compounds, bis­{[mu]-N-[(di­phenyl­phosphanyl)methyl]pyridin-4-amine-[kappa]2N1:P}disilver bis­(perchlorate) aceto­nitrile monosolvate, [Ag2(C18H17N2P)2](ClO4)2·CH3CN, (1), and bis­{[mu]-N-[(di­phenyl­phosphanyl)methyl]pyridin-4-amine-[kappa]2N1:P}bis­[(nitrato-[kappa]2O,O)silver], [Ag2(C18H17N2P)2(NO3)2], (2), each contain disilver macrocyclic [Ag2(C18H17N2P)2]2+ cations lying about inversion centres. The cations are constructed by two N-[(di­phenyl­phosphanyl)methyl]pyridin-4-amine (DPP) ligands linking two Ag+ cations in a head-to-tail fashion. In (1), the unique Ag+ cation has a near-linear coordination geometry consisting of one pyridine N atom and one P atom from two different DPP ligands. Two ClO4- anions doubly bridge two metallomacrocycles through Ag...O and N-H...O weak inter­actions to form a chain extending in the c direction. The half-occupancy aceto­nitrile mol­ecule lies with its methyl C atom on a twofold axis and makes a weak N...Ag contact. In (2), there are two independent [Ag(C18H17N2P)]+ cations. The nitrate anions weakly chelate to each Ag+ cation, leading to each Ag+ cation having a distorted tetra­hedral coordination geometry consisting of one pyridine N atom and one P atom from two different DPP ligands, and two chelating nitrate O atoms. Each dinuclear [Ag2(C18H17N2P)2(NO3)2] mol­ecule acts as a four-node to bridge four adjacent equivalent mol­ecules through N-H...O inter­actions, forming a two-dimensional sheet parallel to the bc plane. Each sheet contains dinuclear molecules involving just Ag1 or Ag2 and these two types of sheet are stacked in an alternating fashion. The sheets containing Ag1 all lie near x = {1 \over 2}, {3 \over 2}, {5 \over 2} etc, while those containing Ag2 all lie near x = 0, 1, 2 etc. Thus, the two independent sheets are arranged in an alternating sequence at x = 0, {1 \over 2}, 1, {3 \over 2} etc. These two different supra­molecular structures result from the different geometric conformations of the templating anions which direct the self-assembly of the cations and anions.

CCDC references: 991653 and 991654

Formula: [Ag2(C18H17N2P)2](ClO4)2·C2H3N and [Ag2(C18H17N2P)2(NO3)2]

Keywords: crystal structure; silver(I) perchlorate; silver(I) nitrate; N-[(di­phenyl­phosphanyl)methyl]pyridin-4-amine; silver(I) complexes.

hkldisplay filedownload file

Structure factor file (CIF format) (218.0 kbytes)
[ doi:10.1107/S2053229614005725/fg33171sup2.hkl ]
Contains datablock 1

hkldisplay filedownload file

Structure factor file (CIF format) (414.5 kbytes)
[ doi:10.1107/S2053229614005725/fg33172sup3.hkl ]
Contains datablock 2


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