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Solid State Metathesis Reactions in Various Applications
Authors:Katharina Gibson  Markus Strbele  Bjrn Blaschkowski  Jochen Glaser  Martina Weisser  Radhakrishnan Srinivasan  Heinz‐Jürgen Kolb  Hans‐Jürgen Meyer
Institution:Katharina Gibson,Markus Ströbele,Björn Blaschkowski,Jochen Glaser,Martina Weisser,Radhakrishnan Srinivasan,Heinz‐Jürgen Kolb,Hans‐Jürgen Meyer
Abstract:Solid state metathesis reactions have been studied in fused silica tubes, by differential thermal analysis, and by X‐ray powder diffraction. A selection of reactions between metal (La, Nb, and Ni) chlorides and lithium nitride or lithium acetylide were investigated to get more insight into reaction pathways and intermediate reaction stages that may be adopted on course of the formation of metal nitrides or carbides. Intermediate compounds are considered to be important because they can control the reactivity of a system. Such compounds were traced by changing the molar ratios of reaction partners away from the salt‐balanced binary metal nitride or carbide target compositions. New preparative perspectives are discovered when metal chlorides were reacted with lithium nitridoborate or lithium cyanamide. Due to their reductive nature towards several d‐block metal chlorides, (BN2)3‐ and (CN2)2‐ react to form metals or metal nitrides plus X‐ray amorphous BN, and probably C3N4. With lanthanum chloride they can react to form nitridoborates and nitridocarbonates. The metathesis reaction between lithium cyanamide and cyanuric chloride (C3N3Cl3) instead of metal chloride was studied for the synthesis of C3N4.
Keywords:Metathesis reactions  Carbides  Nitrides  Cyanamide  Carbon nitride
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