Résumés Année 2003

"A molecular tectonics/crystal enginering approach for building organic/inorganic composites. Potential application to the growth control of hydroxyapatite crystals"

J.-M. PLANEIX, W. JAUNKY, T. DUHOO, J. CZERNUSZKA, M. W. HOSSEINI, E. F. BRES, J. Mat. Chem., 2003, 13, 2521-2524.(download .pdf)

Abstract: A molecular tectonics approach was used for processing organic/hydroxyapatite composites, preliminary results concerning the growth control of hydroxyapatite (HAP) nanocrystals are presented.

"Molecular tectonics : Design of enantiomerically pure single-stranded helical H-bonded molecular networks"

P. GROSSHANS, A. JOUAITI, V. BULACH, J.-M. PLANEIX, M. W. HOSSEINI, J.-F. NICOUD, Cryst. Eng. Comm., 2003, 5, 414-416.( download .pdf )

Abstract: The self-assembly between self-complementary tectons based on the enantiomerically pure isomannide stereoisomer bearing both H-bond donor (OH group) and acceptor (pyridine unit) groups generates analogous enantiomerically pure single-stranded helical infinite H-bonded networks which were structurally characterised by X-ray diffraction studies on single crystals.

"Molecular tectonics : design of coordinating tectons based on fluorene bearing pyridines and structural analysis of their coordination networks generated in the presence of mercury and cobalt salts"

P. GROSSHANS, A. JOUAITI, N. KARDOUH, M. W. HOSSEINI, N. KYRITSAKAS, New J. Chemistry, 2003, 27, 1806-1810.( download .pdf )

Abstract: A series of six new bis-monodentate tectons based fluorene skeleton and bearing two pyridine derivatives as coordinating sites have been designed and prepared. The ability of two of them presenting a "V" type geometry to generate coordination networks in the presence of HgCl2 or CoCl2 acting as metallatectons and offering either a "V" or a square type geometry respectively was structurally studied by X-ray diffraction on single crystals. Whereas a combination of "V" shape organic and metallic tectons leads to a 1-D coordination network, when combining a "V" shape organic tecton with a metallatecton presenting four available coordination sites occupying the corners of a square, a 2-D neutral coordination network was obtained. In the latter case, a two-fold homo interpenetrating architecture was obtained.

"Molecular tectonics : structural and magnetic properties of a discrete Copper binuclear complex and a 1-D coordination network"

S. FERLAY, A. JOUAITI, M. LOÏ, M. W. HOSSEINI, A. DE CIAN, P. TUREK, New J. Chemistry, 2003, 27, 1801-1805.( download .pdf )

Abstract: The two new copper complexes 2 ([Cu2(pyS4)Cl4]. 2CHCl3) and 3 ([Cu2(pyS4)Cl2]2+. 2BF4-) have been prepared, their crystal structure elucidated and their magnetic properties have been studied. The compound 2 is a discrete binuclear copper (II) complex (monoclinic, P 21/n space group, Z = 2, a = 9.7076(3)Å, b = 12.6420(3)Å, c = 16.1419(3) and b = 98.468(2)°. The geometry around the metal centre is a distorted square pyramid. The compound 3, in contrast, is an infinite coordination network formed upon mutual bridging of binuclear species through chloride atoms (monoclinic, C2/c space group, Z = 4, a = 32.475(3)Å, b = 13.496(2)Å, c = 8.7380(5) and b = 96.335(6)). Again, the geometry around each copper atom is closed to a square pyramid. The packing of the 1-D coordination networks generates channels which are occupied by BF4- anions. The magnetic behaviour observed for the 1-D network is comparable to the one corresponding to a discrete chloro-bridged copper (II) binuclear complex. In terms of magnetic coupling, whereas a strong ferromagnetic coupling is observed between the two spin bearers within the dimer (d = 3.467Å) (J/kB = 337 K), a weak interdimer antiferromagnetic interaction is measured (zJ’/kB =-1.6 K).

"Molecular tectonics: from enantiomerically pure sugars to enantiomerically pure triple stranded helical coordination network"

P. GROSSHANS, A. JOUAITI, V. BULACH, J.-M. PLANEIX, M. W. HOSSEINI, J.-F. NICOUD, J. Chem. Soc., Chem. Commun., 2003, 1336-1337. ( download .pdf )

Abstract: The self-assembly between a bismonodentate tecton based on two pyridine units connected to an enantiomerically pure isomannide stereoisomer and HgCl2 leads to the formation of an enantiomerically pure triple stranded helical infinite coordination network which was structurally characterised by X-ray diffraction on single crystal.

"Charge assisted chiral hybride H-bonded molecular networks"

S. FERLAY, R. HOLAKOVSKI, M. W. HOSSEINI, J.-M. PLANEIX, N. KYRITSAKAS, J. Chem. Soc., Chem. Commun., 2003, 1224-1225. ( download .pdf )

Abs tract: The co-crystallisation of [Fe(CN)5NO]2- and cyc lic achiral 12+ and chiral 22+ or 32+ bisamidinium dicationic tectons leads in the crystalline phase to the formation of 1-D H-bonded achiral and chiral molecular networks respectively. In all cases, the network is formed by mutual bridging of the anionic and cationic units through a chelate mode of H-bonding.

"Gradual increase in the dimensionality of cobalt and mercury coordination networks based on conformation of tetradentate tectons"

P. GROSSHANS, A. JOUAITI, M. W. HOSSEINI, N. KYRITSAKAS, New. J. Chem., 2003, 27, 793-797. ( download .pdf )

Abstract: Neutral tetrakis monodentate tectons 1 and 2, based on the pentaerythritol skeleton and bearing four nicotinoyl or isonicotinoyl groups respectively as coordination sites, have been prepared and their ability to generate coordination networks was studied in the presence of HgCl2 or CoCl2 behaving as metallatectons offering either a "V" or a square type geometry respectively. Whereas