Louisiana State University

About: Louisiana State University is a education organization based out in Baton Rouge, Louisiana, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 40206 authors who have published 76587 publications receiving 2566076 citations. The organization is also known as: LSU & Louisiana State University and Agricultural and Mechanical College.

A Luminescent Metal–Organic Framework with Lewis Basic Pyridyl Sites for the Sensing of Metal Ions

Abstract: The last two decades have witnessed significant progress in the design and synthesis of a new type of porous materials generally referred to as metal–organic frameworks (MOFs) and/or coordination polymers which can be readily selfassembled by the coordination of metal cations/clusters with organic linkers. Extensive efforts on such species have not only led to the creation of a huge number of MOFs of diverse topologies and aesthetic beauty, but also initiated a rational design strategy to construct porous materials with high surface areas, predictable structures, and tunable pore sizes to target some important applications, such as gas storage, separation, catalysis, magnetism, sensing, and imaging. Such progress within this field allows us to rationally design and synthesize porous MOFs with functional sites for specific host–guest recognition and thus to tune their functional properties. One of these extensively investigated methodologies is to immobilize unsaturated (open) Lewis acidic metal sites within porous MOFs for gas storage, catalysis, and sensing. Immobilization of Lewis basic sites within porous MOFs, however, has been more challenging, as such Lewis basic sites tend to bind other metal ions to form condensed structures. The very few examples of porous MOFs with Lewis basic sites include POST-1 with pyridyl sites, [Cd(4-btapa)2(NO3)2]·6 H2O·2DMF (4-btapa = 1,3,5-benzenetricarboxylic acid tris[N-(4-pyridyl)amide]) with amide sites and [Zn3(OH)3(2-stp)(bpy)1.5(H2O)]·EtOH·2H2O (2-stp = 2-sulfonylterephthalate; bpy = 4,4’bipyridine) with anionic sulfonate sites. Importantly, POST-1 and [Cd(4-btapa)2(NO3)2] exhibit interesting catalytic activities for the transesterification and Knoevenagel condensation, attributed to pyridyl and amide sites, respectively, highlighting the significance of such Lewis basic sites within porous MOFs for their functional properties. To make use of the preferential binding of lanthanide ions (Ln) to carboxylate oxygen atoms over pyridyl nitrogen atoms in Ln-pyridinecarboxylate complexes, 27] herein we report a rare example of luminescent MOFs, [Eu(pdc)1.5(dmf)]·(DMF)0.5(H2O)0.5 (1, pdc = pyridine-3,5-dicarboxylate), with Lewis basic pyridyl sites for the sensing of metal ions. Compound 1 was synthesized by the solvothermal reaction of [Eu(NO3)3]·(H2O)6 and H2pdc in DMF at 120 8C over night. It was formulated as [Eu(pdc)1.5(dmf)]·(DMF)0.5(H2O)0.5 by elemental microanalysis and single-crystal X-ray diffraction studies, and the phase purity of the bulk material was independently confirmed by powder X-ray diffraction (PXRD) and thermal gravimetric analysis (TGA) (see the Supporting Information, Figure S1-3). Complex 1 is isostructural with [Er(pdc)1.5(dmf)]·(solv)n and [Y(pdc)1.5(dmf)]·(solv)n, in which Eu atoms are bridged by pdc organic linkers to form a three-dimensional rodpacking structure. Each europium atom is coordinated by six oxygen atoms from the carboxylate groups of pdc, and capped by one distorted DMF molecule. One-dimensional hexagonal channels of about 6.3 8.5 along the a axis are filled by the capping DMF molecule, as well as free DMF and water molecules (Figure 1). TGA data indicated that 1 releases the free water and DMF, and terminal DMF molecules in the temperature range of 25–220 8C, to form a guest-free phase [Eu(pdc)1.5] (1 a) which is thermally stable up to 450 8C. The powder X-ray diffraction (PXRD) pattern of the guest-free phase 1a is almost identical with that of the as-synthesized 1, and matches well with that of the anhydrous [Er(pdc)1.5], indicating that the basic 3D framework is retained and the in situ-generated open Eu sites are occupied by carboxylate oxygen atoms, thus the 1D hexagonal channels are accessible to guest molecules. This shift of the carboxylate groups stabilizes the Eu sites and pores in 1a, so, even re-immersed in DMF, no solvent molecules are coordinated. Phase 1a exhibits type I isotherm characteristic N2 adsorption at 77 K with a Langmuir surface area of 537 m g (see the Supporting Information, Figure S4). The most significant structural feature is the presence of free Lewis basic pyridyl sites within the pores, highlighting the potential for their recognition of metal ions and thus for sensing functions. [*] Prof. Dr. B. Chen, L. Wang, Y. Xiao, Y. Cui, Prof. Dr. G. Qian Department of Materials Science & Engineering, State Key Laboratory of Silicon Materials, Zhejiang University Hangzhou 310027 (China) Fax: (+ 86)571-879-51234 E-mail: gdqian@zju.edu.cn

Quantum Information Theory

Abstract: Finally, here is a modern, self-contained text on quantum information theory suitable for graduate-level courses. Developing the subject 'from the ground up' it covers classical results as well as major advances of the past decade. Beginning with an extensive overview of classical information theory suitable for the non-expert, the author then turns his attention to quantum mechanics for quantum information theory, and the important protocols of teleportation, super-dense coding and entanglement distribution. He develops all of the tools necessary for understanding important results in quantum information theory, including capacity theorems for classical, entanglement-assisted, private and quantum communication. The book also covers important recent developments such as superadditivity of private, coherent and Holevo information, and the superactivation of quantum capacity. This book will be warmly welcomed by the upcoming generation of quantum information theorists and the already established community of classical information theorists.

A joint economic-lot-size model for purchaser and vendor

Abstract: In a typical purchasing situation, the issues of price, lot sizing, etc, usually are settled through negotiations between the purchaser and the vendor Depending on the existing balance of power, the end result of such a bargaining process may be a near-optimal or optimal ordering policy for one of the parties (placing the other in a position of significant disadvantage) or, sometimes, inoptimal policies for both parties This paper develops a joint economic-lot-size model for a special case where a vendor produces to order for a purchaser on a lot-for-lot basis under deterministic conditions The focus of this model is the joint total relevant cost It is shown that a jointly optimal ordering policy, together with an appropriate price adjustment, can be beneficial economically for both parties or, at the least, does not place either at a disadvantage

Deep inferior epigastric perforator flap for breast reconstruction.

Abstract: The ideal material for reconstruction of a breast is fat and skin. Most current methods of autogenous reconstruction use myocutaneous flaps. We investigated the feasibility of transfer of skin and fat from the lower abdomen without muscle sacrifice. The flap is based on one, two, or three perforators of the deep inferior epigastric vessels. The study will demonstrate both experimentally and clinically this original technique for breast reconstruction. Fifteen breasts have been successfully reconstructed with this technique. This technique has all of the advantages of the free transverse rectus abdominis myocutaneous flap with decreased possibility of ventral hernia or muscle weakness.