Aza-27-crown-9 Amino Acid

Späth, Andreas; König, Burkhard

doi:10.3390/m660

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Phthalate esters have been reported to be versatile fluorophores. − Using such a functional subunit, the König group developed a luminescent crown ether amino acid, which could act as a particular suitable building block for the construction of amino acid receptors upon combining with guanidine ion groups. Notably, the 21-azacrown-7 was optimized for ammonium ion binding . On this basis, they prepared a series of new ion pair receptors 140 – 142 (Figure ), which exhibited unique binding ability toward selected zwitterionic amino acids and neurotransmitter γ-aminobutyric acid (GABA) in polar protic solvents.…”

Section: Recognition With Macrocyclic Ion Pair Receptorsmentioning

confidence: 99%

Macrocycles as Ion Pair Receptors

et al. 2019

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Cation and anion recognition have both played central roles in the development of supramolecular chemistry. Much of the associated research has focused on the development of receptors for individual cations or anions, as well as their applications in different areas. Rarely is complexation of the counterions considered. In contrast, ion pair recognition chemistry, emerging from cation and anion coordination chemistry, is a specific research field where co-complexation of both anions and cations, so-called ion pairs, is the center of focus. Systems used for the purpose, known as ion pair receptors, are typically di-or polytopic hosts that contain recognition sites for both cations and anions and which permit the concurrent binding of multiple ions. The field of ion pair recognition has blossomed during the past decades. Several smaller reviews on the topic were published roughly 5 years ago. They provided a summary of synthetic progress and detailed the various limiting ion recognition modes displayed by both acyclic and macrocyclic ion pair receptors known at the time. The present review is designed to provide a comprehensive and up-to-date overview of the chemistry of macrocycle-based ion pair receptors. We specifically focus on the relationship between structure and ion pair recognition, as well as applications of ion pair receptors in sensor development, cation and anion extraction, ion transport, and logic gate construction. CONTENTS 3.4.

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Section: Recognition With Macrocyclic Ion Pair Receptorsmentioning

confidence: 99%

Macrocycles as Ion Pair Receptors

et al. 2019

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“…The second step involves employing our own code called astrometry 9 to apply a transformation from pixel to equatorial coordinates to all the observed stars, using the coordinates already assigned to the brightest stars matched in the previous step. The algorithm in this code applies the affine transformation method developed by J Elonen 10 based on the work by Späth (2004). The transformation equations are of the form α = c 0 + c 1 x + c 2 y where α is the right ascension, (x, y) are the pixel coordinates, and the c X coefficients are fitted (similarly for δ, more details in the code's site).…”

Section: Photometric Reduction Processmentioning

confidence: 99%

Sixteen overlooked open clusters in the fourth Galactic quadrant

Perren

Giorgi

Moitinho

et al. 2020

A&A

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Aims. This paper has two main objectives: (1) To determine the intrinsic properties of sixteen faint and mostly unstudied open clusters in the poorly known sector of the Galaxy at 270 • − 300 • , to probe the Milky Way structure in future investigations. (2) To address previously reported systematics in Gaia DR2 parallaxes by comparing the cluster distances derived from photometry with those derived from parallaxes. Methods. Deep UBVI photometry of 16 open clusters was carried out. Observations were reduced and analyzed in an automatic way using the ASteCA package to get individual distances, reddening, masses, ages and metallicities. Photometric distances were compared to those obtained from a Bayesian analysis of Gaia DR2 parallaxes. Results. Ten out of the sixteen clusters are true or highly probable open clusters. Two of them are quite young and follow the trace of the Carina Arm and the already detected warp. The rest of the clusters are placed in the interarm zone between the Perseus and Carina Arms as expected for older objects. We found that the cluster van den Berg-Hagen 85 is 7.5 × 10 9 yrs old becoming then one of the oldest open cluster detected in our Galaxy so far. The relationship of these ten clusters with the Galaxy structure in the solar neighborhood is discussed. The comparison of distances from photometry and parallaxes data, in turn, reveals a variable level of disagreement. Conclusions. Various zero point corrections for Gaia DR2 parallax data recently reported were considered for a comparison between photometric and parallax based distances. The results tend to improve with some of these corrections. Photometric distance analysis suggest an average correction of ∼+0.026 mas (to be added to the parallaxes). The correction may have a more intricate distance dependency, but addressing that level of detail will require a larger cluster sample.

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The Case Study of the Graves Discovered in 1958 at Apulum-Dealul Furcilor Cemetery, Individual and Collective Social Identities in Roman Graves

Musteață¹,

Gál²

2023

EphNap

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The Roman cemetery at Apulum, Dealul Furcilor is one of the well-known and researched Roman sites of this kind from Dacia. Archaeological excavations started in the 19th century and are continuing today. During the Romanian communist regime, the discovered graves and their inventory were published in archaeological reports. Unfortunately, the reports do not include a detailed description of the finds. Additional papers focused on the artefacts and their functionality within the graves were never written. For these reasons, the excavations from this period need reconsideration. Most of the discoveries made in 1958 were stored inside the deposit of The Archaeology and Art History Institute in Cluj-Napoca and were the main subject of my unpublished master’s thesis entitled Identități individuale și colective în necropola romană de la Apulum-Dealul Furcilor. Studiu de caz – descoperirile din anul 1958, “Babeș-Bolyai” University, Cluj. This article resumes the study made in the thesis, provides a detailed catalogue of the archaeological finds and an analysis of the osteological remains found in the deposit at Cluj-Napoca.

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Aza-27-crown-9 Amino Acid

Abstract: Abstract:A luminescent aza-27-crown-9 ether amino acid was prepared by a three-step reaction sequence. The compound signals ammonium ion binding by an increase in emission intensity.

Cited by 3 publications

References 19 publications

Macrocycles as Ion Pair Receptors

Macrocycles as Ion Pair Receptors

Sixteen overlooked open clusters in the fourth Galactic quadrant

The Case Study of the Graves Discovered in 1958 at Apulum-Dealul Furcilor Cemetery, Individual and Collective Social Identities in Roman Graves

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