Synthesis of a bulk crystalline phase of carbon nitride

Dymont, V. P.; Nekrashevich, E. M.; Starchenko, I. M.

doi:10.1134/1.567896

Cited by 6 publications

(2 citation statements)

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“…31 A detailed analysis of the vibrational and structural evolution under pressure is of great importance in understanding the transformation from the highly unsaturated building-block to an interconnected network, providing fundamental information regarding the evolution of CN bonding and reaction mechanisms. 31,32 In this study, we present in situ, high-pressure spectroscopic and structural results for LiN(CN) 2 compressed to 22 GPa. Raman and IR spectroscopies were used to probe the evolution of CN bonding, whereas synchrotron PXRD was used to obtain structural information.…”

Section: Introductionmentioning

confidence: 99%

“…The unsaturated nitrile group has the potential to form new bonds under pressure through cycloaddition-type reactions and could possibly result in the formation of extended network solids . A detailed analysis of the vibrational and structural evolution under pressure is of great importance in understanding the transformation from the highly unsaturated building-block to an interconnected network, providing fundamental information regarding the evolution of CN bonding and reaction mechanisms. , …”

Section: Introductionmentioning

confidence: 99%

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Pressure-Induced Polymerization of LiN(CN)₂

Keefer¹,

Gou

Purdy

et al. 2016

J. Phys. Chem. A

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The high-pressure behavior of lithium dicyanamide (LiN(CN)) was studied with in situ Raman and infrared (IR) spectroscopies, and synchrotron angle-dispersive powder X-ray diffraction (PXRD) in a diamond anvil cell (DAC) to 22 GPa. The fundamental vibrational modes associated with molecular units were assigned using a combination of experimental data and density functional perturbation theory. Some low-frequency modes were observed for the first time. On the basis of spectroscopic and diffraction data, we suggest a polymorphic phase transformation at ∼8 GPa, wherein dicyanamide ions remain as discrete molecular species. Above ca. 18 GPa, dicyanamide units polymerize, forming a largely disordered network, and the extent of polymerization may be increased by annealing at elevated temperature. The polymerized product consists of tricyanomelaminate-like groups containing sp-hybidized carbon-nitrogen bonds and exhibits a visible absorption edge near 540 nm. The product is recoverable to ambient conditions but is not stable in air/moisture.

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Section: Introductionmentioning

confidence: 99%