A Spontaneous Magnetic Moment in an Organic Radical: Synthesis and Characterization of Benzodioxepinyl-1,3,2-dithiazolyl.

The synthesis of the 1,3,2-dithiazolyl radical () derived from 3,4-dihydro-2H-1,5-benzodioxepine is described. Crystals of were grown by vacuum sublimation and adopt the orthorhombic space group . DC SQUID magnetometry reveals Curie-Weiss behavior for > 20 K ( = 0.

Magnetic properties and magnetocaloric effect of Ln = Dy, Tb carborane-based metal-organic frameworks.

We present the synthesis and magneto-thermal properties of carborane-based lanthanide metal-organic frameworks (MOFs) with the formula {[(Ln)(CB-L)(NO)(DMF)]·Solv}, where Ln = Dy or Tb, characterized by dc and ac susceptibility, X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD) and heat capacity measurements. The MOF structure is formed by polymeric 1D chains of Ln ions with three different coordination environments (Ln1, Ln2, Ln3) running along the -axis, linked by carborane-based linkers thus to provide a 3D structure. Static magnetic measurements reveal that these MOFs behave at low temperature as a system of * = 1/2 Ising spins, weakly interacting ferromagnetically along the 1D polymeric chain (/ = +0.

Luminescent and magnetic [TbEu] 2D metal-organic frameworks.

We present the synthesis, through a simple, microwave-assisted method, of lanthanoid-based 2D metal-organic frameworks (MOFs) of general formula [LnLn'(MeCOO)(PhCOO)], including homonuclear compounds ( = 1), LnEu, Tb, and heterometallic compounds, [TbEu]. The crystalline material is formed by neutral nanosheets held together by van der Waals interactions, which can be easily exfoliated by sonication. Photoluminescent emission in the visible range was observed for all of the synthesized 2D MOF compounds excitation of the ligand, showing benzoates are efficient antenna ligands.

Unraveling the Ordered Phase of the Quintessential Hybrid Perovskite MAPbI─Thermophysics to the Rescue.

Hybrid perovskites continue to attract an enormous amount of attention, yet a robust microscopic picture of their different phases as well as the extent and nature of the disorder present remains elusive. Using specific-heat data along with high-resolution inelastic neutron scattering and ab initio modeling, we address this ongoing challenge for the case of the ordered phase of the quintessential hybrid-perovskite MAPbI. At low temperatures, the specific heat of MAPbI reveals strong deviations from the Debye limit, a common feature of pure hybrid perovskites and their mixtures.

Temperature- and Field-Induced Transformation of the Magnetic State in CoGeBO.

A tetravalent-substituted cobalt ludwigite CoGeBO has been synthesized using the flux method. The compound undergoes two magnetic transitions: a long-range antiferromagnetic transition at = 84 K and a metamagnetic one at = 36 K. The sample-oriented magnetization measurements revealed a fully compensated magnetic moment along the - and -axes and an uncompensated one along the -axis leading to high uniaxial anisotropy.