Materials Literature
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Modern micro- and nano-fabrication methods provide a new avenue to prepare controlled model catalysts, which realistically mimic real supported catalysts. Such catalysts consist of 2D arrays of active catalysts deposited on active or inactive support materials. Particle size, shape, separation and support can be syste…
A series of poly[(alkyl ether)phosphazenes] was synthesized and their lower critical solution temperatures (LCST) were examined in water at concentrations from 0.1 to 30.0 wt %. The polymers synthesized were poly[bis(2,3-dimethoxypropanoxy)phosphazene], poly[bis(2,3-bis(2-methoxyethoxy)propanoxy)phosphazene], poly[bis…
This paper describes a computational procedure for the determination of complete crystal structures when the cell dimensions and space group only are known from X-ray crystallography. Molecular structure and conformation are assumed, and cannot be refined. When diffraction intensity data are available, the procedure o…
MCM-41 type mesoporous silica material is synthesized, under mild conditions, in the presence of cetylpyridinium chloride as the templating species. Seven reflections become observable in the powder X-ray diffraction pattern of this material that can be indexed on the basis of a hexagonal close-packed unit cell with a…
In model reactions for the synthesis of phosphine-terminated tentacles of polyamine dendrimers, the amides MeNHCOC 2 H 4 PPh 2 ( 2a ) and (CH 2 NHCOC 2 H 4 PPh 2 ) 2 ( 2b ) were prepared from the spacer phosphine (diphenylphosphino)propionic acid ( 1 ) and methylamine or ethylenediamine, respectively, using EDC [ N -e…
Stable mixed monolayers are prepared by combining Langmuir−Blodgett (LB) deposition with self-assembly. Islands of stable organosilane monolayers are formed on mica by the LB technique and the bare surface is then employed as a substrate for further selective self-assembly. When a surface covered by octadecyltrichloro…
A. C. Benniston, Chem. Soc. Rev., 1996, 25, 427 DOI: 10.1039/CS9962500427
The photochemical formation of the open merocyanine forms of several naphthoxazine-spiro-indolines in different solvents have been studied using both picosecond transient absorption (PTA) and picosecond time-resolved resonance Raman (PTR3) methods. The PTA studies have established the presence of several metastable sp…
This paper describes an experimental method for determining the relative stabilities of hydrogen-bonded aggregates in terms of the mole fraction of dimethyl sulfoxide (DMSO) in chloroform solution, χ DMSO, required to cause their dissociation. It also describes three indices I Tm, I G, and I G /( N −1) that estimate t…
Triblock copolymers polystyrene−polyisoprene−polystyrene are studied in semidilute solutions (1 < C / C * < 8), in a selective solvent, i.e., a nonsolvent for polystyrene and a good solvent for polyisoprene. The mass of the copolymer is equal to 1.6 × 10 5 g/mol and it contains 70% of polyisoprene. Static light scatte…
The reaction of (NH 4 ) 2 [MoO 2 S 2 ], CuI, and Et 4 NI in solid state produces a twin-nest-shaped cluster compound [Et 4 N] 4 [Mo 2 O 2 S 6 Cu 6 I 6 ]. The cluster anion consists of two nest-shaped fragments interconnected through a four-membered Cu(I) 2 Cu ring. The structure of the cluster has been characterized b…
Two Pd catalysts supported on ceria of high (HS) and low (LS) surface area have been investigated. Palladium morphologies and palladium accessibility were studied by CO adsorption using FTIR spectroscopy. Methanol and carbon monoxide were used as probes to assess the surface reduction state and the surface oxygen vaca…
The self‐organization of inorganic precursors in predetermined patterns is the first step towards the ability to synthesize mesoscopic inorganic materials. Several techniques are described, including the immobilization of inorganic precursors by coordination with bilayer ligands (see figure), which led, for example, t…
The preparation and modification of highly functionalized polyether dendrimers containing a versatile diethyl isophthalate terminal group is presented. The convergent synthesis consists of the construction of diester-terminated dendrons containing benzylic bromide functions at the focal point and their subsequent atta…
We conducted a computer simulation for the structural changes of randomly oriented lamellae of block copolymers under steady shear flow and observed two types of structural changes: one is breakup and recombination of lamellae, and the other is undulation of lamellae. To interpret these phenomena, we analyzed the stab…
Silica gel containing diyne units have been obtained from molecular organosilicon precursors and the properties associated to the very reactive unsaturated organic moieties have been explored. The sol−gel polymerization of 1,4-bis(trimethoxysilyl)-1,3-butadiyne ((MeO) 3 SiC⋮CC⋮CSi(OMe) 3 ) quantitatively led to a sils…
Two one-dimensional intercalating molybdenum oxide polymers have been synthesized using different structure-directing units under specific hydrothermal conditions. MoO-0 (NaNH 4 Mo 3 O 10 ) was synthesized using tetramethylammonium hydroxide, and MoO-1(C 6 H 18 N 2 Mo 4 O 13 ) was synthesized using 1,6-hexanediamine.…
Abstract In order to construct bimetallic organometallic donor–acceptor complexes with nonlinear optical (NLO) properties, the bimetallic sesquifulvalene complexes [{CpFe(η 5 ‐C 5 H 4 )}Z{η 7 ‐C 7 H 6 )Cr‐(CO) 3 }]BF 4 (2BF 4 ) have been synthesized with different bridging functions Z ( 2a : Z = ‐ 2b : Z = C 2 ; 2c :…
Thermotropic polyglutamates with photochromic azobenzene side groups are polymers of the “hairy rod” type. They form LB multilayer assemblies, in which the rod-like macromolecules are oriented in the dipping direction. The initial LB films have a well-defined bilayer structure in which the rod-like azobenzene moieties…
Tribological properties of molecular films composed of a fullerene monolayer chemically attached to the functional surface of self-assembled monolayers (C 60 −SAM) were studied by friction force microscopy. We observed very high wear stability of composite fullerene films. The friction coefficient (μ) for these films…