R. M. Claramunt

Bio: R. M. Claramunt is an academic researcher from National University of Distance Education. The author has contributed to research in topics: Carbon-13 NMR & Nuclear magnetic resonance spectroscopy. The author has an hindex of 11, co-authored 40 publications receiving 279 citations.

13C NMR study of polyphenyl-, poly-N-azolyl-and poly-N-benzazoyl-methanes†

Abstract: 13C NMR chemical shifts of 69 substituted methanes (general formula R1R2R3R4C, where the substituents were H, C6H5, Cl, OH, OR, imidazol-1-yl, pyrazol-1-yl, 1,2,4-triazol-1-yl, 1,2,4-triazol-4-yl, benzimidazol-1-yl, indazol-1-yl, indazol-2-yl, benzotriazol-1-yl and benzotriazol-2-yl) are reported. The effects of the various N-substituents on the 13C chemical shifts of the heterocyclic nuclei are reported. The chemical shifts of the methane carbon atom are discussed using an interactive model. Some 1H-13C coupling constants have been measured.

Structure:function relationships in molecular spin-crossover complexes

Abstract: Spin-crossover compounds are becoming increasingly popular for device and sensor applications, and in soft materials, that make use of their switchable colour, paramagnetism and conductivity. The de novo design of new solid spin-crossover compounds with pre-defined switching properties is desirable for application purposes. This challenging problem of crystal engineering requires an understanding of how the temperature and cooperativity of a spin-transition are influenced by the structure of the bulk material. Towards that end, this critical review presents a survey of molecular spin-crossover compounds with good availability of crystallographic data. A picture is emerging that changes in molecular shape between the high- and low-spin states, and the ability of a lattice to accommodate such changes, can play an important role in determining the existence and the cooperativity of a thermal spin-transition in the solid state (198 references).