ic700762x_si_011.cif (34 kB)

Construction of [(η5-C5Me5)MoS3Cu3]-Based Supramolecular Assemblies from the [(η5-C5Me5)MoS3(CuNCS)3]- Cluster Anion and Multitopic Ligands with Different Symmetries

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posted on 06.08.2007, 00:00 by Wen-Hua Zhang, Ying-Lin Song, Zhi-Gang Ren, Hong-Xi Li, Ling-Ling Li, Yong Zhang, Jian-Ping Lang
The assembly of a new family of [(η5-C5Me5)MoS3Cu3]-supported supramolecular compounds from a preformed cluster [PPh4][(η5-C5Me5)MoS3(CuNCS)3]·DMF (1·DMF) with four multitopic ligands with different symmetries is described. Reactions of 1 with 1,2-bis(4-pyridyl)ethane (bpe) (Cs symmetry) or 1,4-pyrazine (1,4-pyz) (D2h symmetry) in aniline gave rise to two polymeric clusters {[{(η5-C5Me5)MoS3Cu3}2(NCS)3(μ-NCS)(bpe)3]·3aniline}n (2) and [(η5-C5Me5)MoS3Cu3(1,4-pyz)(μ-NCS)2]n (3). On the other hand, solid-state reactions of 1 with 2,4,6-tri(4-pyridyl)-1,3,5-triazine (tpt) (D3h symmetry) or 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphyrin (H2tpyp) (D4h symmetry if 21H and 23H of the H2tpyp are omitted) at 100 °C for 12 h followed by extraction with aniline yielded another two polymeric clusters {[(η5-C5Me5)MoS3Cu3(tpt)(aniline)(NCS)2]·0.75aniline· 0.5H2O}n (4) and {[(η5-C5Me5)MoS3Cu3(NCS)(μ-NCS)(H2tpyp)0.4(Cu−tpyp)0.1]·2aniline·2.5benzene}n (5). These compounds were characterized by elemental analysis, IR spectra, UV−vis spectra, 1H NMR, and X-ray analysis. Compound 2 consists of a 2D (6,3) network in which [(η5-C5Me5)MoS3Cu3] cores serve both a T-shaped three-connecting node and an angular two-connecting node to interconnect other equivalent units through single bpe bridges, double bpe bridges, and μ-NCS bridges. Compound 3 has a 3D diamondlike framework in which each [(η5-C5Me5)MoS3Cu3] core, acting as a tetrahedral connecting node, links four other neighboring units by 1,4-pyz bridges and μ-NCS bridges. Compound 4 contains a honeycomb 2D (6,3)core(6,3)tpt network in which each cluster core, serving a trigonal-planar three-connecting node, links three pairs of equivalent cluster cores via three tpt lignads. Compound 5 has a rare scalelike 2D (4,62)core(42,62)ligand network in which each cluster core acts as a T-shaped three-connecting node to link with other equivalent ones through μ-NCS bridges and H2tpyp (or Cu−tpyp) ligands. The results showed that the formation of the four different multidimensional topological structures was evidently affected by the symmetry of the ligands used. In addition, the third-order nonlinear optical properties of 15 in aniline were also investigated by using Z-scan techniques at 532 nm.