Side group dependent room temperature crystallization-induced phosphorescence of benzil based all organic phosphors.

In this work, we report alkoxy substituted benzil based all organic room temperature phosphors which showed crystallization induced phosphorescence (CIP). Nine title compounds were prepared with various alkyl lengths (OCH: = 8-16) and the effect of alkyl side group length on the phosphorescence performance was investigated, as compared to -anisil. It was found that both phosphorescence quantum yield and lifetime increased concomitantly as the alkyl length increased up to nonyloxy (BZL-OC9).

-Pregnane Glycosides from Australian Caustic Vine ( subsp. ).

subsp. , more commonly known as caustic vine, is a leafless succulent that grows in the northern arid zone of Australia. Toxicity toward livestock has been reported for this species, along with use in traditional medicine and its potential anticancer activity.

Genomic insights into rapid speciation within the world's largest tree genus Syzygium.

Species radiations, despite immense phenotypic variation, can be difficult to resolve phylogenetically when genetic change poorly matches the rapidity of diversification. Genomic potential furnished by palaeopolyploidy, and relative roles for adaptation, random drift and hybridisation in the apportionment of genetic variation, remain poorly understood factors. Here, we study these aspects in a model radiation, Syzygium, the most species-rich tree genus worldwide.

Investigating H Adsorption in Isostructural Metal-Organic Frameworks M-CUK-1 (M = Co and Mg) through Experimental and Theoretical Studies.

A combined experimental and theoretical study of H adsorption was carried out in Co-CUK-1 and Mg-CUK-1, two isostructural metal-organic frameworks (MOFs) that consist of M ions (M = Co and Mg) coordinated to pyridine-2,4-dicarboxylate (pdc) and OH ligands. These MOFs possess saturated metal centers in distorted octahedral environments and narrow pore sizes and display high chemical and thermal stability. Previous experimental studies revealed that Co-CUK-1 exhibits a H uptake of 183 cm g at 77 K/1.

Synthesis and chemical stability of technetium nitrides.

We demonstrate the synthesis and phase stability of TcN, TcN, and a substoichiometric TcN from 0 to 50 GPa and to 2500 K in a laser-heated diamond anvil cell. At least potential recoverability is demonstrated for each compound. TcN adopts a previously unpredicted structure identified via crystal structure prediction.

A 70-Year-Old Mystery in Technetium Chemistry Explained by the New Technetium Polyoxometalate [H O ] [Tc O ] ⋅ 4H O.

[H O ] [Tc O ] ⋅ 4H O [1] was prepared from an aqueous Tc O solution concentrated over anhydrous H SO . [Tc O ] is the first polyanionic species to be reported for Tc. The unit cell contains one centrosymmetric [Tc O ] polyanion as well as hydronium ions and water molecules.

Antimicrobial Benzyltetrahydroisoquinoline-Derived Alkaloids from the Leaves of .

Four new alkaloids, ()-nomimantharine trifluoroacetate (), 12-demethylphaeantharine trifluoroacetate (), nominanthranal trifluoroacetate (), and the enolic form of 1-hydroxy-6,7-dimethoxy-2-methylisoquinoline trifluoroacetate (), together with the known dimeric alkaloid phaeantharine trifluoroacetate (), have been isolated from the extract of the leaves of the rainforest tree (Monimiaceae). The structures of these compounds were elucidated by HRMS and 1D and 2D NMR data. ()-Nomimantharine trifluoroacetate () contains an ether linkage connecting a benzylisoquinoline unit with a tetrahydroisoquinoline, a novel class of dimeric alkaloid.

Coexistence of metamagnetism and slow relaxation of magnetization in ammonium hexafluoridorhenate.

The (NH)[ReF] (1) salt was studied by X-ray diffraction, Raman spectroscopy, theoretical calculations, and magnetic measurements. 1 crystallizes in the trigonal space group 3̄1 (Re-F = 1.958(5) Å).

A Grand Challenge. 3. Unbiased Phenotypic Function of Metabolites from Australia Plants and against Parkinson's Disease.

As part of a continuing research program aiming to identify chemical probes to interrogate Parkinson's disease (PD), we have investigated the Australian plants and . The chemical investigations of resulted in the isolation of four new alkaloids, β-lumicolchicosides A-C (-) and γ-lumicolchicoside A (), together with four lumicolchicine derivatives (-) and six colchicine analogues (-) as known structures. The chemical investigations of resulted in the isolation of four new benzoquinolizidine -oxides, tubulosine -oxide (), isotubulosine -oxide (), 9-demethyltubulosine -oxide (), and 9-demethylisotubulosine -oxide (), together with five known benzoquinolizidine alkaloids (-).

Guidelines for uveal melanoma: a critical appraisal of systematically identified guidelines using the AGREE II and AGREE-REX instrument.

Purpose: Clinical practice guidelines provide recommendations for the management of diseases. In orphan conditions such as uveal melanoma (UM), guideline developers are challenged to provide practical and useful guidance even in the absence of high-quality evidence. Here, we assessed the methodological quality and identified deficiencies of international guidelines on UM as a base for future guideline development.

Exploring cycad foliage as an archive of the isotopic composition of atmospheric nitrogen.

Molecular nitrogen (N ) constitutes the majority of Earth's modern atmosphere, contributing ~0.79 bar of partial pressure (pN ). However, fluctuations in pN may have occurred on 10 -10  year timescales in Earth's past, perhaps altering the isotopic composition of atmospheric nitrogen.

Nomenclatural changes in and (Lamiaceae): a tale of more than two genera.

A synopsis of the genera Lour, A.J.Paton, Mwany.

Polymer Brushes on Hexagonal Boron Nitride.

Direct covalent functionalization of large-area single-layer hexagonal boron nitride (hBN) with various polymer brushes under mild conditions is presented. The photopolymerization of vinyl monomers results in the formation of thick and homogeneous (micropatterned, gradient) polymer brushes covalently bound to hBN. The brush layer mechanically and chemically stabilizes the material and allows facile handling as well as long-term use in water splitting hydrogen evolution reactions.

Using UHPLC-MS Profiling for the Discovery of New Dihydro-β-Agarofurans from Australian Celastraceae Plant Extracts.

An analytical method using UHPLC-MS was developed and applied to 16 crude CH₂Cl₂ extracts from Australian Celastraceae plants; the endemic plant materials were accessed from Griffith University's NatureBank resource and included bark, fruit, leaf, root, twig and mixed samples, all of which were collected from Queensland, Australia. The generated UHPLC-MS data were analysed and dereplicated using the scientific databases Dictionary of Natural Products and SciFinder Scholar in order to potentially identify new dihydro-β-agarofurans from local Celastraceae plants. These investigations led to the large-scale extraction and isolation work on a prioritised fruit sample that belonged to the rainforest plant .

Alkaloid diversity in the leaves of Australian Flindersia (Rutaceae) species driven by adaptation to aridity.

The genus Flindersia (Rutaceae) comprises 17 species of mostly Australian endemic trees. Although most species are restricted to rainforests, four have evolved to grow in semi-arid and arid environments. In this study, the leaf alkaloid diversity of rainforest and semi-arid/arid zone adapted Australian Flindersia were compared by LC/MS-MS and NMR spectroscopy.

Hydrogen Uptake on Coordinatively Unsaturated Metal Sites in VSB-5: Strong Binding Affinity Leading to High-Temperature D/H Selectivity.

We examine the adsorption of hydrogen and deuterium into the nanoporous nickel phosphate, VSB-5. On the basis of gas sorption analysis, VSB-5 exhibits one of the highest measured H heats of adsorption (HOA) for hydrogen (16 kJ/mol) yet reported. This high HOA is consistent with an unusually large red shift in the Q(1) and Q(0) hydrogen vibrational modes as measured with in situ infrared spectroscopy.

Molecular and Electronic Structures of MO (M = Mn, Tc, Re).

The molecular and electronic structures of the group 7 heptoxides were investigated by computational methods as both isolated molecules and in the solid-state. The metal-oxygen-metal bending angle of the single molecule increased with increasing atomic number, with ReO preferring a linear structure. Natural bond orbital and localized orbital bonding analyses indicate that there is a three-center covalent bond between the metal atoms and the bridging oxygen, and the increasing ionic character of the bonds favors larger bond angles.

Ditechnetium Heptoxide Revisited: Solid-State, Gas-Phase, and Theoretical Studies.

Ditechnetium heptoxide was synthesized from the oxidation of TcO with O at 450 °C and characterized by single-crystal X-ray diffraction, electron-impact mass spectrometry (EI-MS), and theoretical methods. Refinement of the structure at 100 K indicates that TcO crystallizes as a molecular solid in the orthorhombic space group Pbca [a = 7.312(3) Å, b = 5.

Lignans from the Australian Endemic Plant Austrobaileya scandens.

The sole species of the vascular plant family Austrobaileyaceae, Austrobaileya scandens, is endemic to the tropical rainforest of northeastern Queensland, Australia. A single lead-like enhanced fraction of A. scandens showed potent inhibition against human prostate cancer PC3 cells.

Patterns of Phylogenetic Diversity of Subtropical Rainforest of the Great Sandy Region, Australia Indicate Long Term Climatic Refugia.

Australia's Great Sandy Region is of international significance containing two World Heritage areas and patches of rainforest growing on white sand. Previous broad-scale analysis found the Great Sandy biogeographic subregion contained a significantly more phylogenetically even subset of species than expected by chance contrasting with rainforest on white sand in Peru. This study aimed to test the patterns of rainforest diversity and relatedness at a finer scale and to investigate why we may find different patterns of phylogenetic evenness compared with rainforests on white sands in other parts of the world.

Coconut Laurels: The Leaf Essential Oils from Four Endemic Australian Cryptocarya Species: C. bellendenkerana, C. cocosoides, C. cunninghamii and C. lividula (Lauraceae).

The leaf oils of four species of Cryptocarya, endemic to Australia, were examined. These species are known colloquially as 'coconut laurels' due to the purported distinctive aroma from the crushed foliage. C.

Bioaffinity Mass Spectrometry Screening.

Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTICR-MS or ESI-FTMS) was used to screen 192 natural product extracts and a 659-member natural product-based fragment library for bindings to a potential malaria drug target, Plasmodium falciparum Rab11a (PfRab11a, PF13_0119). One natural product extract and 11 fragments showed binding activity. A new natural product, arborside E, was identified from the active extract of Psydrax montigena as a weak binder.