Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds. 5232-99-5, Name is Ethyl 2-cyano-3,3-diphenylacrylate, molecular formula is C18H15NO2, belongs to Triazoles compound, is a common compound. In a patnet, author is Ahmed, Manan, once mentioned the new application about 5232-99-5, Quality Control of Ethyl 2-cyano-3,3-diphenylacrylate.
Dual-supramolecular contacts induce extreme Hofmann framework distortion and multi-stepped spin-crossover
An extended nitro-functionalised 1,2,4-triazole ligand has been used to induce considerable lattice distortion in a 2-D Hofmann framework material via competing supramolecular interactions. Single crystal X-ray diffraction analyses on [Fe-3(N-cintrz)(6)(Pd(CN)(4))(3)]center dot 6H(2)O (N-cintrz: (E)-3-(2-nitrophenyl)acrylaldehyde) reveal a substantial deviation from a regular Hofmann structure, in particular as the intra- and inter-layer contacts are dominated by hydrogen-bonding interactions rather than the typical pi-stacking arrays. Also, the 2-D Hofmann layers show an assortment of ligand conformations and local Fe-II coordination environments driven by the optimisation of competing supramolecular contacts. Temperature-dependent magnetic susceptibility measurements reveal a two-step spin crossover (SCO) transition. Variable temperature structural analyses show that the two crystallographically distinct Fe-II centres, which are arranged in stripes (2 : 1 ratio) within each Hofmann layer, undergo a cooperative HS <-> HS/LS <-> LS (HS = high spin, LS = low spin) transition without periodic spin-state ordering. The mismatch between crystallographic (2 : 1) and spin-state (1 : 1) periodicity at the HS : LS step provides key insight into the competition (frustration) between elastic interactions and crystallographically driven order.
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