Materials based on ureidopyrimidinone (UPY) dimers and Adenine (A) / Thymine (T) derivatives were... more Materials based on ureidopyrimidinone (UPY) dimers and Adenine (A) / Thymine (T) derivatives were synthesized and characterized by advanced solid state NMR (Nuclear Magnetic Resonance) techniques. Silylated UPY molecules were used as model compounds, leading to structured organic-inorganic materials after hydrolysis and condensation processes (sol-gel reactions). High resolution 1H solid state NMR has been extensively used for the in-depth description of the H-bond networks, including very fast MAS (Magic Angle Spinning) experiments at very high field and DQ (double quantum) recoupling experiments. The chemical nature of the organic-inorganic interface has been illuminated by such techniques. In, particular, it has been demonstrated that H-bond networks were preserved during sol-gel reactions and were comparable to those observed in the UPY crystalline precursors.
... NN Vlasova, GY Zhila, AI Kirillov and MG Voronkov, Heteroat. Chem., 1995, 6, 311. 9 A. Adima,... more ... NN Vlasova, GY Zhila, AI Kirillov and MG Voronkov, Heteroat. Chem., 1995, 6, 311. 9 A. Adima, JJE Moreau and M. Wong Chi Man, J. Mater. Chem., 1997, 7, 2331. 10 KJ Shea, DA Loy and OW Webster, Chem. Mater., 1989, 1, 574; KJ Shea, DA Loy and OW Webster, J. Am. ...
Imprinted materials: Monosilylated derivatives of melamine and cyanuric acid are used in the prep... more Imprinted materials: Monosilylated derivatives of melamine and cyanuric acid are used in the preparation of hybrid silica. The assembly of the melamine and cyanuric acid moieties through molecular recognition properties is the key factor in building a bridged silsesquioxane and an imprinted hybrid silica (see picture).magnified imageTwo monotrialkoxysilylated compounds that consist of complementary fragments of melamine (M) and cyanuric acid (CA) have been synthesised. The molecular recognition properties of the M and CA fragments through complementary hydrogen bonds (DAD and ADA; D=donor, A=acceptor) are the key factor used to direct the formation of hybrid silica materials by using a sol–gel process. These materials were synthesised following two methods: First, an organo‐bridged silsesquioxane was obtained by the hydrolysis of the two complementary monotrialkoxysilylated melamine and cyanuric acid derivatives, with fluoride ions as a catalyst. The hydrogen‐bonding interactions be...
Materials based on ureidopyrimidinone (UPY) dimers and Adenine (A) / Thymine (T) derivatives were... more Materials based on ureidopyrimidinone (UPY) dimers and Adenine (A) / Thymine (T) derivatives were synthesized and characterized by advanced solid state NMR (Nuclear Magnetic Resonance) techniques. Silylated UPY molecules were used as model compounds, leading to structured organic-inorganic materials after hydrolysis and condensation processes (sol-gel reactions). High resolution 1H solid state NMR has been extensively used for the in-depth description of the H-bond networks, including very fast MAS (Magic Angle Spinning) experiments at very high field and DQ (double quantum) recoupling experiments. The chemical nature of the organic-inorganic interface has been illuminated by such techniques. In, particular, it has been demonstrated that H-bond networks were preserved during sol-gel reactions and were comparable to those observed in the UPY crystalline precursors.
... NN Vlasova, GY Zhila, AI Kirillov and MG Voronkov, Heteroat. Chem., 1995, 6, 311. 9 A. Adima,... more ... NN Vlasova, GY Zhila, AI Kirillov and MG Voronkov, Heteroat. Chem., 1995, 6, 311. 9 A. Adima, JJE Moreau and M. Wong Chi Man, J. Mater. Chem., 1997, 7, 2331. 10 KJ Shea, DA Loy and OW Webster, Chem. Mater., 1989, 1, 574; KJ Shea, DA Loy and OW Webster, J. Am. ...
Imprinted materials: Monosilylated derivatives of melamine and cyanuric acid are used in the prep... more Imprinted materials: Monosilylated derivatives of melamine and cyanuric acid are used in the preparation of hybrid silica. The assembly of the melamine and cyanuric acid moieties through molecular recognition properties is the key factor in building a bridged silsesquioxane and an imprinted hybrid silica (see picture).magnified imageTwo monotrialkoxysilylated compounds that consist of complementary fragments of melamine (M) and cyanuric acid (CA) have been synthesised. The molecular recognition properties of the M and CA fragments through complementary hydrogen bonds (DAD and ADA; D=donor, A=acceptor) are the key factor used to direct the formation of hybrid silica materials by using a sol–gel process. These materials were synthesised following two methods: First, an organo‐bridged silsesquioxane was obtained by the hydrolysis of the two complementary monotrialkoxysilylated melamine and cyanuric acid derivatives, with fluoride ions as a catalyst. The hydrogen‐bonding interactions be...
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