# Miguel A. Requena-Torres's research while affiliated with Towson University and other places

## Publications (22)

Article
Full-text available
Nitriles play a key role as molecular precursors in prebiotic experiments based on the RNA-world scenario for the origin of life. These chemical compounds could have been partially delivered to the young Earth from extraterrestrial objects, stressing the importance of establishing the reservoir of nitriles in the interstellar medium. We report here...
Preprint
Nitriles play a key role as molecular precursors in prebiotic experiments based on the RNA-world scenario for the origin of life. These chemical compounds could have been partially delivered to the young Earth from extraterrestrial objects, stressing the importance of establishing the reservoir of nitriles in the interstellar medium. We report here...
Preprint
Full-text available
Theories on the origins of life propose that early cell membranes were synthesized from amphiphilic molecules simpler than phospholipids such as fatty alcohols. The discovery in the interstellar medium (ISM) of ethanolamine, the simplest phospholipid head group, raises the question whether simple amphiphilic molecules are also synthesized in space....
Article
Full-text available
We report the first detection of the phosphorus monoxide ion (PO+) in the interstellar medium. Our unbiased and very sensitive spectral survey toward the G+0.693–0.027 molecular cloud covers four different rotational transitions of this molecule, two of which (J = 1–0 and J = 2–1) appear free of contamination from other species. The fit performed,...
Article
Full-text available
We present the first detection of ( Z )-1,2-ethenediol, (CHOH) 2 , the enol form of glycolaldehyde, in the interstellar medium toward the G+0.693−0.027 molecular cloud located in the Galactic Center. We have derived a column density of (1.8 ± 0.1) × 10 ¹³ cm ⁻² , which translates into a molecular abundance with respect to molecular hydrogen of 1.3...
Preprint
We present the first detection of ($Z$)-1,2-ethenediol, (CHOH)$_2$, the enol form of glycolaldehyde, in the interstellar medium towards the G+0.693-0.027 molecular cloud located in the Galactic Center. We have derived a column density of (1.8$\pm$0.1)$\times$10$^{13}$ cm$^{-2}$, which translates into a molecular abundance with respect to molecular...
Preprint
Full-text available
We report the first detection of the phosphorus monoxide ion (PO$^{+}$) in the interstellar medium. Our unbiased and very sensitive spectral survey towards the G+0.693$-$0.027 molecular cloud covers four different rotational transitions of this molecule, two of which ($J$=1$-$0 and $J$=2$-$1) appear free of contamination from other species. The fit...
Article
Full-text available
The Central Molecular Zone (CMZ) contains most of the mass of our Galaxy but its star formation rate is one order of magnitude lower than in the Galactic disk. This is likely related to the fact that the bulk of the gas in the CMZ is in a warm (>100 K) and turbulent phase with little material in the prestellar phase. We present in this Letter obser...
Preprint
Amines, in particular primary amines (R-NH$_2$) are closely related to the primordial synthesis of amino acids since they share the same structural backbone. However, only limited number of amines has been identified in the ISM which prevents us from studying their chemistry as well as their relation to pre-biotic species that could lead to the eme...
Article
Full-text available
Significance The detection of ethanolamine ( N H 2 C H 2 C H 2 OH) in a molecular cloud in the interstellar medium confirms that a precursor of phospholipids is efficiently formed by interstellar chemistry. Hence, ethanolamine could have been transferred from the proto-Solar nebula to planetesimals and minor bodies of the Solar System and thereafte...
Preprint
Cell membranes are a key element of life because they keep the genetic material and metabolic machinery together. All present cell membranes are made of phospholipids, yet the nature of the first membranes and the origin of phospholipids are still under debate. We report here the first detection in space of ethanolamine, NH$_2$CH$_2$CH$_2$OH, which...
Article
The chemical compounds carrying the thiol group (-SH) have been considered essential in recent prebiotic studies regarding the polymerization of amino acids. We have searched for this kind of compounds toward the Galactic Centre quiescent cloud G+0.693-0.027. We report the first detection in the interstellar space of the trans-isomer of monothiofor...
Preprint
The chemical compounds carrying the thiol group (-SH) have been considered essential in recent prebiotic studies regarding the polymerization of amino acids. We have searched for this kind of compounds toward the Galactic Centre quiescent cloud G+0.693-0.027. We report the first detection in the interstellar space of the trans-isomer of monothiofor...
Preprint
Full-text available
We present SiO J=2-1 maps of the Sgr B2 molecular cloud, which show shocked gas with a turbulent substructure comprising at least three cavities at velocities of [10,40] km s$^{-1}$ and an arc at velocities of [-20,10] km s$^{-1}$. The spatial anti-correlation of shocked gas at low and high velocities, and the presence of bridging features in posit...
Article
One of the proposed scenarios for the origin of life is the primordial RNA world, which considers that RNA molecules were likely responsible for the storage of genetic information and the catalysis of biochemical reactions in primitive cells, before the advent of proteins and DNA. In the last decade, experiments in the field of prebiotic chemistry...
Preprint
One of the proposed scenarios for the origin of life is the primordial RNA world, which considers that RNA molecules were likely responsible for the storage of genetic information and the catalysis of biochemical reactions in primitive cells, before the advent of proteins and DNA. In the last decade, experiments in the field of prebiotic chemistry...
Preprint
Full-text available
Small imines containing up to three carbon atoms are present in the interstellar medium. As alkynyl compounds are abundant in this medium, propargylimine thus represents a promising candidate for a new interstellar detection. The goal of the present work is to perform a comprehensive laboratory investigation of the rotational spectrum of propargyli...
Preprint
In the past decade, Astrochemistry has witnessed an impressive increase in the number of detections of complex organic molecules. Some of these species are of prebiotic interest such as glycolaldehyde, the simplest sugar, or amino acetonitrile, a possible precursor of glycine. Recently, we have reported the detection of two new nitrogen-bearing com...
Article
Full-text available
In the past decade, astrochemistry has witnessed an impressive increase in the number of detections of complex organic molecules. Some of these species are of prebiotic interest such as glycolaldehyde, the simplest sugar, or aminoacetonitrile, a possible precursor of glycine. Recently, we have reported the detection of two new nitrogen-bearing comp...
Article
We present 1″-resolution ALMA observations of the circumnuclear disk (CND) and the interstellar environment around Sgr A∗. The images unveil the presence of small spatial scale¹²CO (J = 3-2) molecular "cloudlets" (≲ 20 000 AU size) within the central parsec of the Milky Way, in other words, inside the cavity of the CND, and moving at high speeds, u...
Preprint
Full-text available
We present ALMA observations of the circumnuclear disk (CND) and the environment around Sgr A*. The images unveil the presence of small spatial scale 12CO (J=3-2) molecular "cloudlets" within the central parsec of the Milky Way and moving at high speeds, up to 300 km/s along the line-of-sight. The 12CO-emitting structures show intricate morphologie...

## Citations

... More recent work by Jørgensen et al. (2012) also identified glycolaldehyde toward IRAS 16293-2422. The detection of the enol isomer of glycolaldehyde (HOCH 2 CHO), which forms via a hydrogen shift to produce an R 1 R 2 C = C(OH)R 3 substructure, was reported in laboratory astrochemistry experiments by Kleimeier & Kaiser (2022) and in deep space by Rivilla et al. (2022). Z-1,2-ethenediol (HOCHCHOH), only one hydroxyl group (-OH) away from ethenetriol (3), was detected toward the molecular cloud G+0.693-0.027 ...
... More recently, the quantum chemical cluster calculations performed by Woon (2021) have proposed new surface reactions between C + , which is distributed throughout the whole Galactic Center (Harris et al., 2021), and two very abundant species, HCN and HNC (e.g. Colzi et al. 2022), embedded in H 2 O icy grain mantles. The C + ion reacts with HCN and HNC forming intermediate species that attacks neighboring H 2 O molecules of the ices, resulting into the radicals HOCHNC and HOCHCN. ...
... Given the new detection of molecules toward G+0.693-0.027 (Rodríguez-Almeida et al. 2021b; Zeng et al. 2021;Rivilla et al. 2022), it appears to exhibit chemistry unique from other hot cores like Sgr B2(N) or Orion KL. In addition, many of the species shown in Figure 5 do not have observed laboratory spectra. ...
... These are refractory species that, once trapped on the mantles or in the core of the grains, cannot desorb and, therefore, become undetectable (Woods et al. 2015). In the last three years, seven new gas-phase S-bearing species were identified, most of them in TMC-1 (Cernicharo et al. 2021;Rodríguez-Almeida et al. 2021), and characterized by a C-S chemical bond. ...
... Finally, we conclude the present minireview by presenting some original results showing that investigations on highly compressed molecular systems can be conducted via the coupling of ab initio molecular dynamics simulations with enhanced sampling techniques such as advanced metadynamics methods [72]. In particular, we have chosen an exemplary chemical reaction where glycine (H 2 NCH 2 COOH)-the simplest amino acid also found in the Murchison meteorite-is transformed into ethanolamine (H 2 NCH 2 CH 2 OH), a precursor of phospholipids recently detected in a molecular cloud in the interstellar medium [124]. Furthermore, amino alcohols are believed to stabilize short oligonucleotide sequences present in the prebiotic pool [125]. ...
... In the last decades, and especially in the last years, astrochemistry has shown that interstellar chemistry is able to synthesize building blocks of key biomolecules. Several of the precursors of ribonucleotides spotted by the prebiotic experiments in the laboratory have been detected in the ISM, like cyanoacetylene (HC 3 N, Turner 1971), cyanamide (NH 2 CN, Turner et al., 1975), glycolaldehyde (CH 2 OHCHO, Hollis et al. 2004, urea (NH 2 CONH 2 , Belloche et al. 2019), hydroxylamine (NH 2 OH, Rivilla et al. 2020), and 1,2-ethenediol ((CHOH) 2 ; Rivilla et al. 2022a). Among the key simple molecular precursors required for the RNA world, numerous works have stressed the dominant role of a particular family of compounds, nitriles, which are molecules with the C + N moiety. ...
... This peptide-type bond is present in several interstellar complex organic molecules (iCOMs see Colzi et al. 2021 and also McGuire 2018 for a census), such as formamide (HC(O)NH 2 ; Halfen et al. 2015;Cernicharo et al. 2016;Ligterink et al. 2017;Martín-Doménech et al. 2017;Ligterink et al. 2017;Csengeri et al. 2019;Gorai et al. 2020;Manigand et al. 2020;Colzi et al. 2021;Ligterink et al. 2021), acetamide (CH 3 C(O)NH 2 ; Hollis et al. 2006, Halfen et al. 2015, Cernicharo et al. 2016Belloche et al. 2017;Ligterink et al. 2020Ligterink et al. , 2022Colzi et al. 2021), N-methylformamide (CH 3 NHCHO; Belloche et al. 2017Belloche et al. , 2019Ligterink et al. 2020;Colzi et al. 2021) and urea (NH 2 C(O)NH2; Belloche et al. 2019;Jiménez-Serra et al. 2020). Nevertheless, among all iCOMs, only four species contain the so-called isocyanate (-N=C=O) functional group. ...
... If so, they should have been formed in the same dynamical process. Following this speculative scenario, the combination with the detected reservoir of fast moving molecular cloudlets (Moser et al. 2017;Goicoechea et al. 2018;Hsieh et al. 2021) and the simulation of an infalling cloud presented in Jalali et al. (2014) might provide a suitable explanation for the in-situ star formation event. The authors of Jalali et al. (2014) model a 100 M cloud that crosses the Bondi radius of Sgr A* (for observations, see also Tsuboi et al. 2018). ...