Alfredo M. Simas

5.9k total citations · 2 hit papers
131 papers, 5.1k citations indexed

About

Alfredo M. Simas is a scholar working on Materials Chemistry, Inorganic Chemistry and Organic Chemistry. According to data from OpenAlex, Alfredo M. Simas has authored 131 papers receiving a total of 5.1k indexed citations (citations by other indexed papers that have themselves been cited), including 69 papers in Materials Chemistry, 45 papers in Inorganic Chemistry and 37 papers in Organic Chemistry. Recurrent topics in Alfredo M. Simas's work include Lanthanide and Transition Metal Complexes (57 papers), Radioactive element chemistry and processing (39 papers) and Advanced Chemical Physics Studies (25 papers). Alfredo M. Simas is often cited by papers focused on Lanthanide and Transition Metal Complexes (57 papers), Radioactive element chemistry and processing (39 papers) and Advanced Chemical Physics Studies (25 papers). Alfredo M. Simas collaborates with scholars based in Brazil, Canada and United States. Alfredo M. Simas's co-authors include Ricardo O. Freire, Gerd B. Rocha, Ricardo L. Longo, Oscar L. Malta, G.F. de Sá, E.F da Silva, Petrus A. Santa‐Cruz, Celso de Mello Donegá, James J. P. Stewart and Vedene H. Smith and has published in prestigious journals such as The Journal of Chemical Physics, PLoS ONE and Chemistry of Materials.

In The Last Decade

Alfredo M. Simas

128 papers receiving 5.0k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Spectroscopic properties and design of highly luminescent lanthanide coordination complexes

2000 1.4k citations Oscar L. Malta, Alfredo M. Simas et al. profile →
RM1: A reparameterization of AM1 for H, C, N, O, P, S, F, Cl, Br, and I

2006 589 citations Gerd B. Rocha, Ricardo O. Freire et al. Journal of Computational Chemistry profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Alfredo M. Simas Brazil	32	3.4k	1.9k	1.6k	1.0k	756	131	5.1k
Ricardo L. Longo Brazil	29	3.0k 0.9×	1.4k 0.8×	1.1k 0.7×	506 0.5×	714 0.9×	118	4.2k
Arnout Ceulemans Belgium	36	2.4k 0.7×	1.1k 0.6×	706 0.5×	1.4k 1.3×	1.0k 1.3×	205	4.5k
Hans‐Beat Bürgi Switzerland	42	3.2k 0.9×	1.6k 0.8×	2.0k 1.3×	2.3k 2.3×	834 1.1×	169	6.8k
Stephen K. Wolff Australia	12	1.5k 0.4×	924 0.5×	1.4k 0.9×	1.7k 1.7×	449 0.6×	13	4.2k
A. Alan Pinkerton United States	39	1.7k 0.5×	1000 0.5×	1.6k 1.0×	2.4k 2.4×	423 0.6×	222	4.8k
André Grand France	35	1.4k 0.4×	1.4k 0.8×	974 0.6×	2.3k 2.3×	926 1.2×	138	5.4k
Frank Wennmohs Germany	12	2.3k 0.7×	990 0.5×	1.5k 0.9×	2.0k 2.0×	1.7k 2.2×	15	6.7k
Daniel J. Grimwood Australia	8	1.3k 0.4×	784 0.4×	1.1k 0.7×	1.4k 1.4×	297 0.4×	9	3.4k
Yu Takano Japan	28	1.0k 0.3×	1.1k 0.6×	798 0.5×	1.2k 1.2×	684 0.9×	132	4.1k
Piercarlo Fantucci Italy	44	2.5k 0.7×	812 0.4×	1.4k 0.9×	732 0.7×	2.7k 3.5×	177	6.9k

Countries citing papers authored by Alfredo M. Simas

Since Specialization

Citations

This map shows the geographic impact of Alfredo M. Simas's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Alfredo M. Simas with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Alfredo M. Simas more than expected).

Fields of papers citing papers by Alfredo M. Simas

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Alfredo M. Simas. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Alfredo M. Simas. The network helps show where Alfredo M. Simas may publish in the future.

Co-authorship network of co-authors of Alfredo M. Simas

This figure shows the co-authorship network connecting the top 25 collaborators of Alfredo M. Simas. A scholar is included among the top collaborators of Alfredo M. Simas based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Alfredo M. Simas. Alfredo M. Simas is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Navarro, Marcelo, et al.. (2025). Unmasking the UV Photobleaching of β-Diketonate [Eu(BTFA)₄]⁻ Complexes as an Energy-Driven Photoreduction Process. Inorganic Chemistry. 64(8). 3842–3856. 1 indexed citations

Gonçalves, Simone M. C., et al.. (2024). Microwave Synthesis and Luminescence Efficiencies in Mixed‐Ligand Europium Complexes. Chemistry - An Asian Journal. 19(24). e202400800–e202400800.

Lima, Nathalia Bezerra de, José Diogo L. Dutra, Simone M. C. Gonçalves, Ricardo O. Freire, & Alfredo M. Simas. (2016). Chemical Partition of the Radiative Decay Rate of Luminescence of Europium Complexes. Scientific Reports. 6(1). 21204–21204. 29 indexed citations

Dutra, José Diogo L., et al.. (2016). Parameters for the RM1 Quantum Chemical Calculation of Complexes of the Trications of Thulium, Ytterbium and Lutetium. PLoS ONE. 11(5). e0154500–e0154500. 2 indexed citations

Lima, Nathalia Bezerra de, et al.. (2015). Faster Synthesis of Beta-Diketonate Ternary Europium Complexes: Elapsed Times & Reaction Yields. PLoS ONE. 10(12). e0143998–e0143998. 10 indexed citations

Dutra, José Diogo L., et al.. (2014). Semiempirical Quantum Chemistry Model for the Lanthanides: RM1 (Recife Model 1) Parameters for Dysprosium, Holmium and Erbium. PLoS ONE. 9(1). e86376–e86376. 12 indexed citations

Simas, Alfredo M., et al.. (2013). Antinociceptive pyrimidine derivatives: aqueous multicomponent microwave assisted synthesis. Tetrahedron Letters. 54(26). 3462–3465. 23 indexed citations

Lima, Nathalia Bezerra de, Simone M. C. Gonçalves, Severino Alves, & Alfredo M. Simas. (2013). A Comprehensive Strategy to Boost the Quantum Yield of Luminescence of Europium Complexes. Scientific Reports. 3(1). 2395–2395. 112 indexed citations

Godoy, Michele Maria Gonçalves de, Edmundo Pessoa Lopes, Ricardo Oliveira Silva, et al.. (2010). Hepatitis C virus infection diagnosis using metabonomics. Journal of Viral Hepatitis. 17(12). 854–858. 42 indexed citations

10.

Freire, Ricardo O., Gerd B. Rocha, & Alfredo M. Simas. (2006). Lanthanide complex coordination polyhedron geometry prediction accuracies of ab initio effective core potential calculations. Journal of Molecular Modeling. 12(4). 373–389. 54 indexed citations

11.

Faustino, Wagner M., Oscar L. Malta, Ercules E. S. Teotônio, et al.. (2006). Photoluminescence of Europium(III) Dithiocarbamate Complexes: Electronic Structure, Charge Transfer and Energy Transfer. The Journal of Physical Chemistry A. 110(7). 2510–2516. 100 indexed citations

12.

Rocha, Gerd B., Ricardo O. Freire, Alfredo M. Simas, & James J. P. Stewart. (2006). RM1: A reparameterization of AM1 for H, C, N, O, P, S, F, Cl, Br, and I. Journal of Computational Chemistry. 27(10). 1101–1111. 589 indexed citations breakdown →

13.

Freire, Ricardo O., et al.. (2005). Sparkle model for AM1 calculation of neodymium(III) coordination compounds. Journal of Photochemistry and Photobiology A Chemistry. 177(2-3). 225–237. 22 indexed citations

14.

Freire, Ricardo O., Gerd B. Rocha, & Alfredo M. Simas. (2005). Modeling lanthanide complexes: Sparkle/AM1 parameters for ytterbium (III). Journal of Computational Chemistry. 26(14). 1524–1528. 16 indexed citations

15.

Lira, Bruno Freitas, et al.. (2004). Synthesis and complete assignments of 1H and 13C NMR spectra of mesoionic 1,3-thiazolium-2 thiolates. ARKIVOC. 2004(6). 12–21. 6 indexed citations

16.

Rakov, Nikifor, et al.. (2001). Reverse saturable absorption and anti-Stokes fluorescence in mesoionic compounds pumped at 532 nm. Applied Optics. 40(9). 1389–1389. 11 indexed citations

17.

Duarte, Hélio A., Sandra Helena Vieira de Carvalho, Eucler B. Paniago, & Alfredo M. Simas. (1999). Importance of Tautomers in the Chemical Behavior of Tetracyclines†. Journal of Pharmaceutical Sciences. 88(1). 111–120. 101 indexed citations

18.

Andrade, Antônio V.M. de, Ricardo L. Longo, Alfredo M. Simas, & Gilberto F. de Sá. (1996). Theoretical model for the prediction of electronic spectra of lanthanide complexes. Journal of the Chemical Society Faraday Transactions. 92(11). 1835–1839. 60 indexed citations

19.

Echevarrı́a, Aurea, Sérgio E. Galembeck, Maria Aparecida M. Maciel, et al.. (1995). REACTIONS OF AROYL CHLORIDES WITH 1,4-DIPHENYLTHIOSEMICARBAZIDE: FORMATION OF BOTH 1,3,4-THIADIAZOLIUM-2-AMINIDES AND 1,3,4-TRIAZOLIUM-2-THIOLATE. Heterocyclic Communications. 1(2-3). 129–136. 9 indexed citations

20.

Andrade, Antônio V.M. de, Nivan B. da Costa, Alfredo M. Simas, & Gilberto F. de Sá. (1995). Sparkle model for the quantum chemical AM1 calculation of europium complexes of coordination number nine. Journal of Alloys and Compounds. 225(1-2). 55–59. 40 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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