Ultralowthermal conductivity draws great attention in avariety of fields of applications such as thermoelectrics and thermal barrier coatings.H erein, the crystal structure and transport properties of Cu 4 TiSe 4 are reported. Cu 4 TiSe 4 is au nique example of an on-toxic and low-cost material that exhibits al attice ultra-low thermal conductivity of 0.19 Wm À1 K À1 at room temperature.T he main contribution to the unusually low thermal conductivity is connected with the atomic lattice and its dynamics.T his ultralow value of lattice thermal conductivity (k L )c an be attributed to the presence of the localized modes of Cu, which partially hybridizew ith the Se atoms,w hich in turn leads to avoidance of crossing of acoustic phonon modes that reach the zone boundary with ar educed frequency.L ike ap honon glass electron crystal, Cu 4 TiSe 4 could also open ar oute to efficient thermoelectric materials,even, with chalcogenides of relatively high electrical resistivity and al arge band gap,p rovided that their structures offer as ublattice with lightly bound cations.

A microporous La-metal-organic framework (MOF) has been synthesized by the reaction of La(NO3 )3 ⋅6 H2 O with a ligand 4,4',4''-s-triazine-1,3,5-triyltri-p-aminobenzoate (TATAB) featuring three carboxylate groups. Crystal structure analysis confirms the formation of 3D MOF with hexagonal micropores, a Brunauer-Emmett-Teller (BET) surface area of 1074 m(2)  g(-1) and high thermal and chemical stability. The CO2 adsorption capacities are 76.8 cm(3)  g(-1) at 273 K and 34.6 cm(3)  g(-1) at 293 K, a highest measured CO2 uptake for a Ln-MOFs.

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The synthesis of a novel chemically coupled hybrid material based on Fe2O3‐Fe3O4 heterostructure and nitrogen‐doped reduced graphene oxide (N‐rGO) for the development of high performance supercapacitor devices is demonstrated. The chemically coupled hybrid material is synthesized in a one‐pot method under hydrothermal condition, resulting in the formation of crystalline α‐Fe2O3 and poorly crystalline/amorphous Fe3O4. The Fe2O3‐Fe3O4 particles have an average size of 30–50 nm. Chemical integration of Fe2O3‐Fe3O4 with N‐rGO through Fe‐O−C bonds is achieved. The chemical coupling of N‐rGO with pseudocapacitive Fe2O3‐Fe3O4 enhances the overall performance of the composite. Two asymmetric supercapacitor devices using the hybrid material either as positive or negative electrode are fabricated. The supercapacitive behaviour is evaluated in terms of specific capacitance, energy density, power density and cycling stability, showing excellent performance. The asymmetric device based on hybrid material as the positive and activated carbon as the negative electrode, delivers a specific capacitance of 111.95 F g−1 at 0.8 A g−1 with an energy density of 44.93 Wh kg−1. The supercapacitor has excellent cycling stability with a capacitance retention of >92 % even after 10000 extensive charge‐discharge cycles. The all‐solid‐state asymmetric supercapacitor device is fabricated using gel electrolyte. Solid‐state devices connected in series successfully light up 29 LEDs.

Three new copper(ii) Schiff base complexes have been prepared and characterized. DFT calculations were employed to estimate the contribution of different non-covalent interactions in the extended supra-molecular networks.