Self-assembly of 2∶2 and 3∶3 metallamacrocyclic complexes of platinum(II) with symmetrical, bipodal N′,N′,N ‴N ‴-tetraalkyl-N,N ″-phenylenedicarbonylbis(thiourea)

Abstract

Bipodal NЈ,NЈ,NٞNٞ-tetraalkyl-N,NЉ-phenylenedicarbonylbis(thiourea) readily 'self-assemble into' Pt 2 L 2 and Pt 3 L 3 metallamacrocyclic complexes depending on whether the S,O chelating moieties are meta or para relative to each other in the ligand. Thus treatment of PtCl 4 2with one equivalent of 3,3,3Ј,3Ј-tetra(n-butyl)-1,1Ј-terephthaloylbis(thiourea), {H 2 L 1 } 2 , leads to the exclusive formation of the cis-[Pt(L 1 -S,O)] 3 complex, while 3,3,3Ј,3Ј-tetraethyl-1,1Ј-isophthaloylbis(thiourea), {H 2 L 2 } 2 , yields only the cis-[Pt(L 2 -S,O)] 2 complex. The cis-[Pt(L 1 -S,O)] 3 complex forms extremely friable crystals, necessitating X-ray data collection in mother-liquor, the lattice of which was found to contain chloroform, water and ethanol molecules as 'guests'. By contrast, the sparingly soluble diethyl-substituted Pt 2 L 2 complex does not include solvent molecules in the crystal lattice.

2,6-Dipicolinoylbis(N,N-dialkylthioureas) as versatile building blocks for oligo- and polynuclear architectures

“…1). [21][22][23] This coordination mode has also been found for the extended tetraalkylisophthaloylbis(thioureas) in binuclear bis-chelates of the type 2 with Cu 2+ , Ni 2+ , Zn 2+ , Co 2+ , Cd 2+ , Pt 2+ and Pd 2+ ions, [24][25][26][27][28] 31 Attempts with corresponding 2,6-dipicolinoylbis(N,Ndialkylthioureas), H 2 L (Fig. 2), seem to be more promising.…”

AgI Metallacoronates and HgII Metallacryptates Derived from a Catechol‐Based Aroylbis(N,N‐diethylthiourea)

“…The coordination chemistry of aroyl( N , N ‐dialkylthioureas) has been dominated for a long time by metal complexes with bidentate benzoylthioureas, HL benz Because of their hard oxygen and soft sulfur donor atoms and an acidic amido group, such compounds are versatile ligands and form stable complexes with a large number of metal ions. However, the structural coordination chemistry of the HL benz ligands as well as of the related bis(thioureas) H 2 L meta or H 2 L para has mainly focused on metal ions that prefer square‐planar or pseudo‐planar coordination environments such as Ni 2+ , Pd 2+ ,, Pt 2+ ,, and Cu 2+ . Additionally, a few examples of tris complexes with M 3+ ions have been reported, and the coordination chemistry of rhenium and technetium with such ligands is relatively well explored .…”

18 Supramolecular coordination chemistry

“…25 Similarly, a cyclic array of four nucleotide bases (B) and two trans-{Pt(amine) 2 } 2 units is held together by a combination of Pt^N coordinate bonds within the {Pt(amine) 2 B 2 } units, and multiple hydrogen bonding between the two {Pt(amine) 2 B 2 } units. 28 The cyclic hexanuclear complex [{Pt(en) 2 (L 26 )} 3 ] 12 , in which L 26 acts as a 2,2 H -bipyridine-like chelate to the {Pd(en)} 2 unit and also as a 4,4 H -bipyridine-like link between two {Pt(en)} 2 units, is a highly charged receptor with a strong af¢nity for anions. The Cu 2 centres are strongly antiferromagnetically coupled.…”