Nickel(II) complexes of cyclic tetradentate thioethers

Abstract

Three tetradentate ligands, 1,4,8,11 -tetrathiacyclotetradecane (TTP), 2,5,9,12-tetrathiatridecane (TTT), and 13,14-benzo-1,4,8,11 -tetrathiacyclopentadecane (TTX), have been prepared. The nickel(II) tetrafluoroborate complexes of these ligands are the first low-spin nickel(II) species reported having four thioethers as donors. Ni(TTP)2+ and Ni(TTX)2+ constitute the first reported complexes of tetradentate macrocyclic ligands containing only sulfur donor atoms. Tetragonal Ni(TTP)X2 species, where X = NCS, Cl, Br, and I, have been prepared and their electronic spectra used to calculate a Dqxa of 1070 cm-1 for the macrocycle. The Ni(TTP)I2 com-

The removal of mercury from water by open chain ligands containing multiple sulfurs

“…3S2OH [47]. Sodium ethoxide (15.0 g, 220 mmol) was dissolved in approximately 200 mL of absolute ethanol, then 1,3-propanedithiol (1.00 mL, 109 mmol) was added.…”

“…The ligand structures and abbreviated names are given in Fig. 2a-d. All but 3S2SH are new compounds; a synthesis of 3S2SH has been reported previously, but the compound was not utilized for mercury precipitation [47]. A key feature of these ligands is that they provide Hg with four sulfur bonds while remaining neutral, thereby reducing water solubility.…”

Synthesis and characterization of two novel tin(IV) compounds containing 12‐membered metallarings

“…1a and 1b were prepared by the known procedures [7]. IR spectra were recorded in the region 4000-400 cm −1 as KBr pellets using a Bruker-Vector spectrometer.…”

“…In contrast, complexes of these ligands with main group elements have been much less studied. Similarly studies exist of the 1,11-dioxa-4,8-dithiaundecane (1a) and 1,4,8,11-tetrathiaundecano (1b) with transition metals [5][6][7] but their chemistry with main group elements have not been studied until now.…”

Thiophenophane metal complexes. III. Preparation, X-ray structure, and properties of 2,5,7,10-tetrathia[12] (2, 5) thiophenophane, L, and [Ag2L2]2+, its dinuclear silver complex cation

“…Purification can be achieved by washing the crude brown liquid with saturated sodium carbonate solution and then water until the washings are neutral, drying over anhydrous MgS04, and recrystallizing from petroleum ether or by distilling under reduced pressure. Sodium (1.15 g, 50.0 mmol) was dissolved in commercial absolute ethanol (500 mL) under an atmosphere of dry nitrogen and 1,4,7,10-tetrathiadecane (12) To a solution of AgC104 (0.052 g, 0.25 mmol) in acetonitrile (10 mL) was added a solution of L3 (0.080 g, 0.25 mmol) in dichloromethane (5 mL). The resulting solution was filtered immediately and the filtrate was left in a beaker to evaporate slowly, giving eventually white crystals that were collected by filtration, washed with acetonitrile, and dichloromethane and dried in air.…”