F.-F. Li et al. / Journal of Molecular Structure 787 (2006) 106–112
111
silver(I) and can be compared with those of related compounds:
[Ag2(pz)2(PPh3)2] at d 9.87 and [Ag2(pz)2(PPh3)3] at d 6.13 [9].
There should be various degrees of association in addition to
dissociation of PPh3 and perhaps also of sulfonate anions, i.e.
an equilibrium based on dynamic exchange, which takes place
very rapidly on the NMR time-scale, just as observed in
[Ag(im)(PPh3)3] [10], and [Ag2(pz)2(PPh3)3] [9].
3.3. Conclusion
Four new silver(I) sulfonate compounds incorporating PPh3
acting as an auxiliary donor ligand have been synthesized and
characterized. The structures of these compounds have been
determined by single-crystal X-ray analysis. All compounds
have discrete structures rather than polymeric structures as a
result of the presence of the bulky terminal ligand PPh3. In
addition the compounds 1–3 display room-temperature
photoluminescence.
Fig. 5. Molecular structure of [Ag4L4(PPh3)10]$8H2O 4. All the H atoms are
omitted for clarity.
Acknowledgements
WethanktheNationalNaturalScienceFoundationofChina(No.
20471014), the Fok Ying Tung Education Foundation and the
Natural Science Foundation of Jilin province (China) for Support.
a distorted trigonal coordination geometry. Each sulfonate
group coordinates to only one silver ion, which is similar to that
observed in compounds 1, 2 and 3. Although each of Ag(1) and
Ag(2) is bonded to one sulfonate oxygen atom, the numbers of
PPh3 molecules bonded to Ag(1) and Ag(2) are two and three,
respectively. This difference may be on account of the steric
repulsion among the PPh3 molecules. Moreover it is
noteworthy that compound 4 represents the first silver
tetrasulfonate with discrete structure. In addition there are
eight lattice water molecules in the unit cell, which do not show
any covalent interactions in the structure. We failed to obtain
the structure of silver 1,3,6,8-pyrenetetrasulfonate. Since L4
contains four sulfonate groups, this compound is supposed to
have a 3D polymeric structure.
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