Abstract
The first title compound, C29H24S2, L1, represents an example of an anthracene-based functionalized di-thio-ether, which may be useful as a potential chelating or terminal ligand for coordination chemistry. This di-thio-acetal L1 crystallizes in the monoclinic space group P21/c. The phenyl rings of the benzyl groups and that of the anthracene unit form dihedral angles of 49.21 (4) and 58.79 (5)° and the crystal structure displays short C-H⋯π contacts. Surprisingly, when attempting to coordinate L1 to [PdCl2(PhCN)2], instead of the targeted chelate complex [PdCl2(κ2-L1)], a cleavage reaction leads to the formation of the centrosymmetric hexa-nuclear cyclic cluster of composition [Pd6(μ2-SCH2Ph)12] Pd6, or [Pd6(C7H7S)12]·C14H8O2. This tiara-shaped hexa-mer crystallizing in the triclinic space group P consists of six approximately square planar Pd(II)S4 centers, which are inter-connected through twelve μ2-bridging benzyl thiol-ate groups. The Pd⋯Pd contacts range from 3.0892 (2) to 3.1609 (2) Å and can be considered as weakly bonding. The unit cell of Pd6 contains also a co-crystallized anthracene-9,10-dione mol-ecule.
Highlights
The first title compound, C29H24S2, L1, represents an example of an anthracenebased functionalized dithioether, which may be useful as a potential chelating or terminal ligand for coordination chemistry
This dithioacetal L1 crystallizes in the monoclinic space group P21/c
This tiara-shaped hexamer crystallizing in the triclinic space group P1 consists of six approximately square planar Pd(II)S4 centers, which are interconnected through twelve 2-bridging benzyl thiolate groups
Summary
No examples of structurally characterized anthracene-based thioacetals could be found within the Cambridge Structural Database These disparities make this field interesting for further investigations. In this context, we synthesized the anthracene thioacetal L1 with the objective of using it as an S-donor ligand for the assembly of potentially luminescent coordination compounds. The complete spectroscopic data are reported in the Synthesis and crystallization section With this starting material in hand, we attempted to ligate L1 to [PdCl2(PhCN)2], (Fig. 1). The isolation of Pd6 was hampered by the co-crystallization of important amounts of the eight-membered cluster Pd8 [Pd8(2-SCH2Ph)16], having a structure similar to that of [Pd8(2-SPr)16] (Higgins et al, 1988) Details of this reaction will be reported elsewhere
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