Ca2Te3O8, a new phase in the CaO–TeO2system

Single crystals of dicalcium octaoxidotritellurate(IV), Ca2Te3O8, were obtained from a CsCl/NaCl melt with CaO and TeO2as educts in the molar ratio of 1:2. Ca2Te3O8crystallizes isotypically with Pb3Te2O8and is comprised of two unique Ca, four Te and eight O sites. One calcium cation has eight and the other nine coordination partners. Both coordination polyhedra are considerably distorted. Two kinds of oxotellurate(IV) anions with the same formula [Te3O8]4−are present. One is an infinite zigzag chain anion consisting of pairs of [TeO4] bisphenoids linked to a trigonal–pyramidal [TeO3] group with a connectivity of [(TeO1/1O2/2)(TeO2/1O2/2)2]n, while the other is a finite anion made up of one central [TeO4] bisphenoid linked to two [TeO3] trigonal pyramids and has a connectivity of [(TeO2/1O1/2)2(TeO2/2O2/1)]. In the crystal, the anions are organized in layers extending parallel to (100). Adjacent layers are held together by the calcium cations to define a three-dimensional framework structure.

Lipophilic halogen-free ionic liquid with antibacterial and anti-biofilm activities against Pseudomonas aeruginosa

A halogen-free ionic liquid (IL) designed with long alkyl chain anion is reported. 1-methylimidazolium stearate (MIM stearate) synthesized through Bronsted acid-base reaction has shown improved lipophilic character and is able to penetrate bacterial cell walls. Antimicrobial activities against Gram-negative bacteria, Escherichia coli, and Pseudomonas aeruginosa were observed. Anti-biofilm assays showed effectivity against the biofilm of Pseudomonas aeruginosa. At 50 µg/mL the %biofilm inhibition of MIM stearate towards P. aeruginosa biofilm formation is comparable to the Bromofuran positive control. Brine shrimp lethality assay showed weak toxicity indicating the IL to be safe and benign. The synthesized MIM stearate showed good promise as an antimicrobial and anti-biofilm agent.

Synthesis, crystal structure and magnetic properties of the complex [C(NH2)3]2[Mn(N3)4] with a polynuclear azido-bridged chain anion

A new complex [C(NH2)3]2[Mn(N3)4], in which MnII cations are alternatively bridged by double EE azide-bridges and the [Mn(N3)4]n2− chains are separated by guanidinium cation bilayers, has been synthesized and characterized by single crystal X-ray diffraction, infrared (IR) spectroscopy, elemental analyses, and magnetic measurements. Magnetic susceptibility data indicate antiferromagnetic interaction among the MnII ions.