Thermo-Mechanical Behaviour of LCC in Presence of Glassy Phase Containing Sintered Alumina Aggregate

Two types of low cement castable (LCC) coded as C1 and C2 were prepared utilizing 50wt% previously synthesized sintered alumina aggregate (HA]. and HA2), 25wt% calcined kaolin aggregate, 20wt% reactive alumina and 5wt% calcium aluminate cement (CAC). Physico and thermo-mechanical properties of both the castables heated at different temperatures were compared. The results indicated that the C2 castable showed higher density and cold crushing strength due to enhanced sintering in presence of glassy phase. In contrast, C1 castable exhibited higher thermo-mechanical properties due to aggregate purity. The deterioration in hot modulus of rupture (HMOR values 5.98 MPa for Cl and 5.10 MPa for C2) and refractoriness under load (RUL values 1620 for C1 and 1515 degrees C for C2) in C2 is within the acceptable limit for many high temperature applications. The phase composition of 1500 degrees C heated castables and densely packed microstructure with clusters of corundum grains (major) and rod like mullite crystals embedded in the matrix shown beneficial effect on their physico and thermo-mechanical properties

Sensing of tryptophan by a non-toxic cobalt(II) complex

The first report of a cobalt(ii) based non-toxic, hemocompatible, fluorescent probe that sense Trp and BSA by reducing internal fluorescence quenching of Trp in aqueous solution.</p

1D lead(II) coordination chains with carboxylate containing ligands. A rare example of polyrotaxane 1D -> 1D interpenetrated coordination polymer

The structural determination of twointeresting lead(II) coordination polymers, namely [Pb(ind)2(H2O)]n (1) and [Pb2(dbsf)2(bipy)]n (2) (Hind = indane-2-carboxylic acid, H2dbsf= 4,4′-sulfonyldibenzoic acid, and bipy 4,4′- bipyridine), reveals in the second an unexpected polyrotaxane 1D → 1D interpenetrated coordination polymer thanks to the hemidirected coordination geometry of the metal and the rings formed by the dicarboxybiphenyl sulfone ligands along the 1D chain

Two three-dimensional coordination polymers of lead(II) with iminodiacetate and naphthalene-dicarboxylate anions: Synthesis, characterization and luminescence behavior

Two lead(II) compounds [Pb3(idiac)3(phen)2(H2O)] . 2(H2O) (1) and [Pb(ndc)]n (2), where H2idiac = iminodiacetic acid, phen = 1,10-phenanthroline and H2ndc = naphthalene-2,6-dicarboxylicacid ,have been synthesized and structurally characterized. Singlecrystal X-ra ydiffraction analysis showed that compound 1 is adiscrete trinuclear complex (of two-fold symmetry) which evolves to a supramolecular 3D network via \u3c0\u2013\u3c0 interactions, while i ncompound 2 the naphthalene dicarboxylate anion act as a linker to form a three dimensional architecture, where the anion adopts a bis-(bidentatebridging) coordination mode connecting four Pb(II) centers.The photoluminescence property of the two complexes hasbeenstudied

Three New Co-ordination Polymers of Zinc(II) and Cadmium(II) with Dicarboxylate and Bipyridine Ligands: Synthesis, Structure and Luminescence Study

Three coordination polymers of zinc(II) and cadmium(II) of formula {[Zn(bipy)(NIPH)]0.15H2O}n(1), {[Cd2(bipy)2(NIPH)2]2H2O}n (2) and {[Cd2(bipy)4 (BDAC)(NO3)](NO3)6H2O}n (3) (NIPH = 5-nitro-isophthalic acid, H2BDAC = 1,4-benzenediacrylic acid and bipy = 2,20-bipyridine) have been synthesized and structurally characterized by X-ray single crystal diffraction analysis. All the complexes display 1D coordination polymers where M(bipy) units are connected by dicarboxylate anions(and also by nitrate in 3)acting as bridging ligands. While in 1 and 3 a zig–zag chain is generated, in case of 2 a double linear chain is formed by the two crystallographic distinct Cd atoms. In solid state all the complexes expand the dimensionality to 3D by means of p–p interactions among p rings and H-bonds generated by lattice water molecules. The fluorescence study indicates intraligand p–p* charge transfer is the reason for emission in all the complexes

Three manganese(II) coordination polymers with mixed donor ligands: synthesis, X-ray structures and luminescence properties

Three new coordination polymers of manganese(II) of formulae [Mn3(phen)2(phdac)3]2H2O (1), [Mn(4,40-bipy)(H2O)4](cbprop)(2) and [Mn(2,20-bipy)(4-nph)(H2O)2]2 (3) (phen = 1,10-phenanthroline, 4,40-bipy = 4,40-bipyridine, 2,20-bipy = 2,20-bipyridine, H2phdac = 1,4-phenylenediacetic acid, H2cbprop = 4-carboxybenzenepropanoic acid and H2nph = 4-nitrophthalic acid) have been synthesized and structurally characterized by X-ray single-crystal diffraction analysis. The metal complexes possess 2D (1), 1D (2) and 0D (3) dimensionalities. In each case, the crystal packing shows three-dimensional architecture by means of p–p interactions and/or hydrogen bonding supported by coordinated and lattice water molecules. The emission spectra show metal-perturbed intra-ligand p*–p charge transfer transitions for 1 and p*–p and p*–n charge transfer transitions for 3

Topological aspects of lanthanide\u2013adipate\u2013aqua compounds: Close packed and open framework structures

A searchintheCambridgeStructuralDatabase(CSD)forlanthanidecomplexeswithadipate[OOC(CH2)4 COO]2 12 and aqualigandsretrievedafairnumberofcompounds.Tothisdatasetanewlanthanummetal\u2013 organic framework,{[La2(adip)3(H2O)2] (1) (adipH2\ubcadipic acid),synthesisedandstructurallycharac- terized intheselabs,wasincluded.Thecrystalstructuresofthesecoordinationpolymers,ofgeneral formulation [Ln2(adip)3(H2O)x], exhibitavarietyoftopologiesanddimensionality,whichwereclustered in differentclassesanddescribedindetail.Itwasexploredthatthemajorityoftheseevidencesthe presence ofmetalchainsordinuclear Ln2 entities (separatedinbothcasesby4.0\u20134.8 \uc5),where lanthanide ionsaredifferentlyconnectedbycarboxylategroupswithchelatingoroxygen-bridging mode. Thedifferentamountofcoordinatedwatermoleculesappeartoaffectthesolidstatenetworks. Moreoverthecrystalpackingofthesecompoundsshowspeculiaraspectsandexampleswerereportedin the literaturewherethelongalkylchainofadipateconnectorsgiverisetointerpenetratedstructures,or to porousmaterialwherelatticewaterorneutrallargermoleculesareclathrated