The reaction of [RuHCl(CO)(PPh 3 ) 3 ] with an equimolar amount of salicylaldehyde-4(N)-methylthiosemicarbazone [H 2 -(Sal-mtsc)] resulted in two entities, namely [Ru(H-Sal-mtsc)Cl(CO) (PPh 3 ) 2 ] (1) and [Ru(Salmtsc)(CO)(PPh 3 ) 2 ] (2) from a single tub. The new complexes were characterized by various spectro (IR, absorption and NMR), analytical and single crystal X-ray diffraction studies. From the crystallographic studies, it is confirmed that in complex 1, the ligand coordinated through the thiolate sulfur and the deprotonated hydrazinic nitrogen N(2), resulting in the formation of an unusual strained four membered chelate ring. The third potential donor, phenolic oxygen, remained uncoordinated. In complex 2, the ligand coordinated as an ONS chelate with the formation of more common five and six membered chelate rings. Complexes 1 and 2 have been tested for their DNA/protein binding properties by taking CT-DNA/lysozyme as models. From the protein binding studies, the alterations in the secondary structure of lysozyme by the ruthenium(II) complexes (1 and 2) were confirmed with synchronous and threedimensional fluorescence spectroscopic studies. The in vitro cytotoxicity of the newly-synthesized complexes was carried out in two different human tumour cell lines, A549 and HepG2. The cytotoxicity studies showed that complex 2 exhibited higher activity than 1. † Electronic supplementary information (ESI) available. CCDC 821302 for [Ru-(H-Sal-mtsc)(CO)Cl(PPh 3 ) 2 ]•CH 3 CN (1) and 821303 for [Ru(Sal-mtsc)(CO)(PPh 3 ) 2 ] (2). For ESI and crystallographic data in CIF or other electronic format see

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The Bismuth Hydrogen Sulfate [Bi 2(SO4)2(dmso)8](HSO4)2. -[Bi 2(SO4)2(dmso)8](HSO4)2 is prepared by the reaction of basic [Bi 6O4(OH)4(NO3)6]·H2O with either thiosalicylic acid or H2SO4 in DMSO (80 C, 7 h, slow diffusion of Me2CO into the solution). The formation of sulfate ions is observed in the presence of either Bi 3+ or [Bi6O4(OH)4] 6+ indicating Bi-induced oxidation of thiosalicylic acid. The compound crystallizes in the triclinic space group P1 (Z = 1, single crystal XRD) and is composed of alternating layers of [Bi 2(SO4)2(dmso)8] 2+ cations and anions. Within the anionic layers, two adjacent are linked to each other by hydrogen bridges. IR spectra and thermal decomposition studies reveal the formation of Bi 2O(SO4)2 and Bi2O2(SO4) as intermediates and Bi28O32(SO4)10 as the final product. -(WROBEL, L.; MIERSCH, L.; SCHLESINGER, M.; RUEFFER, T.; LANG, H.; MEHRING*, M.; Z.