Lothar Helm

14.7k total citations · 3 hit papers
191 papers, 11.1k citations indexed

About

Lothar Helm is a scholar working on Materials Chemistry, Inorganic Chemistry and Electronic, Optical and Magnetic Materials. According to data from OpenAlex, Lothar Helm has authored 191 papers receiving a total of 11.1k indexed citations (citations by other indexed papers that have themselves been cited), including 134 papers in Materials Chemistry, 59 papers in Inorganic Chemistry and 50 papers in Electronic, Optical and Magnetic Materials. Recurrent topics in Lothar Helm's work include Lanthanide and Transition Metal Complexes (118 papers), Radioactive element chemistry and processing (49 papers) and Magnetism in coordination complexes (49 papers). Lothar Helm is often cited by papers focused on Lanthanide and Transition Metal Complexes (118 papers), Radioactive element chemistry and processing (49 papers) and Magnetism in coordination complexes (49 papers). Lothar Helm collaborates with scholars based in Switzerland, France and United States. Lothar Helm's co-authors include André E. Merbach, Oleg V. Yazyev, A.E. Merbach, Éva Tóth, D. Hugh Powell, Alain Borel, André E. Merbach, Dirk Pubanz, Lon J. Wilson and C. COSSY and has published in prestigious journals such as Science, Chemical Reviews and Journal of the American Chemical Society.

In The Last Decade

Lothar Helm

191 papers receiving 10.8k 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.

Defect-induced magnetism in graphene

2007 1.2k citations Oleg V. Yazyev, Lothar Helm Physical Review B profile →
Inorganic and Bioinorganic Solvent Exchange Mechanisms

2005 641 citations Lothar Helm, André E. Merbach profile →
Structural and Dynamic Parameters Obtained from ¹⁷O NMR, EPR, and NMRD Studies of Monomeric and Dimeric Gd³⁺ Complexes of Interest in Magnetic Resonance Imaging: An Integrated and Theoretically Self-Consistent Approach¹

1996 578 citations D. Hugh Powell, Lothar Helm et al. profile →

Peers

Countries citing papers authored by Lothar Helm

Since Specialization

Citations

This map shows the geographic impact of Lothar Helm'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 Lothar Helm with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Lothar Helm more than expected).

Fields of papers citing papers by Lothar Helm

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Lothar Helm. 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 Lothar Helm. The network helps show where Lothar Helm may publish in the future.

Co-authorship network of co-authors of Lothar Helm

This figure shows the co-authorship network connecting the top 25 collaborators of Lothar Helm. A scholar is included among the top collaborators of Lothar Helm 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 Lothar Helm. Lothar Helm 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

#	Work	Indexed citations
1	Pharmacokinetics and biodistribution study of self-assembled Gd-micelles demonstrating blood-pool contrast enhancement for MRI 2019 ·International Journal of Pharmaceutics ·(unknown), (unknown), Lindsey A. Crowe, Yohan van de Looij, Sébastien Lenglet, Aurélien Thomas, Lothar Helm, Jean‐Paul Vallée, Éric Allémann	5
2	Gadolinium complexes of monophosphinic acid DOTA derivatives conjugated to cyclodextrin scaffolds: efficient MRI contrast agents for higher magnetic fields 2012 ·Dalton Transactions ·(unknown), Lothar Helm, Jan Kotek, Petr Hermann, I. Lukeš	31
3	Hyperfine Coupling Constants on Inner‐Sphere Water Molecules of Gd^III‐Based MRI Contrast Agents 2012 ·ChemPhysChem ·David Esteban‐Gómez, A. De Blas, T. Rodríguez-Blas, Lothar Helm, Carlos Platas‐Iglesias	86
4	Aqueous solubility and speciation of Te(IV) at elevated temperatures 2009 ·Geochimica et Cosmochimica Acta ·Pascal V. Grundler, Allan Pring, Joël Brugger, Paul G. Spry, Lothar Helm	7
5	Lanthanide chelates of (bis)-hydroxymethyl-substituted DTTA with potential application as contrast agents in magnetic resonance imaging 2009 ·Dalton Transactions ·Sara C. Silvério, (unknown), André F. Martins, José A. Martins, João Paulo André, Lothar Helm, M. Isabel M. Prata, Ana C. Santos, Carlos F. G. C. Geraldes	16
6	Novel DOTA-based prochelator for divalent peptide vectorization: synthesis of dimeric bombesin analogues for multimodality tumor imaging and therapy 2008 ·Chemical Communications ·K. Abiraj, (unknown), Martin Kretzschmar, Lothar Helm, Helmut R. Maëcke	46
7	A benzene-core trinuclear Gd^IIIcomplex: towards the optimization of relaxivity for MRI contrast agent applications at high magnetic field 2008 ·Dalton Transactions ·João Bruno Livramento, Lothar Helm, Angélique Sour, Conlin P. O’Neil, André E. Merbach, Éva Tóth	64
8	Physicochemical and MRI characterization of Gd3+-loaded polyamidoamine and hyperbranched dendrimers 2007 ·JBIC Journal of Biological Inorganic Chemistry ·(unknown), Loïck Moriggi, Philipp Schmidt, Claudia Weidensteiner, Rainer Kneuer, André E. Merbach, Lothar Helm, Éva Tóth	70
9	Isomerization Mechanisms of a Labile Co(II) Octahedral Complex 2006 ·CHIMIA International Journal for Chemistry ·(unknown), Ghénadie Novitchi, Lothar Helm, Aurélian Gulea, André E. Merbach	2
10	Phosphinic derivative of DTPA conjugated to a G5 PAMAM dendrimer: an¹⁷O and¹H relaxation study of its Gd(iii) complex 2006 ·Dalton Transactions ·(unknown), Angélique Sour, Lothar Helm, Éva Tóth, Jan Kotek, I. Lukeš, André E. Merbach	37
11	Superparamagnetic gadonanotubes are high-performance MRI contrast agents 2005 ·Chemical Communications ·Balaji Sitharaman, Kyle Kissell, Keith B. Hartman, Lesa A. Tran, A. Baikalov, Irene Rusakova, Yanyi Sun, Htet A. Khant, Steven J. Ludtke, Wah Chiu, Sabrina Laus, Éva Tóth, Lothar Helm, André E. Merbach, Lon J. Wilson	258
12	Isotropic Knight shift of metallic carbon nanotubes 2005 ·Physical Review B ·Oleg V. Yazyev, Lothar Helm	19
13	MD Simulations of Acyclic and Macrocyclic Gd³⁺‐Based MRI Contrast Agents: Influence of the Internal Mobility on Water Proton Relaxivity 2003 ·Chemistry - A European Journal ·(unknown), Alain Borel, Lothar Helm, André E. Merbach	35
14	Molecular Dynamics Simulation of [Gd(egta)(H2O)]− in Aqueous Solution: Internal Motions of the Poly(amino carboxylate) and Water Ligands, and Rotational Correlation Times 2002 ·Chemistry - A European Journal ·(unknown), Kenneth I. Hardcastle, Lothar Helm, Silvio Aime, Mauro Botta, André E. Merbach	38
15	Kinetics and Mechanism of Complex Formation of Nickel(II) with Tetra-N-alkylated Cyclam in N,N-Dimethylformamide (DMF): Comparative Study on the Reactivity and Solvent Exchange of the Species Ni(DMF)₆²⁺ and Ni(DMF)₅Cl⁺ 2000 ·Inorganic Chemistry ·Horst Elias, R. Schumacher, (unknown), (unknown), Lothar Helm, André E. Merbach, Stefan Ulrich	12
16	Mechanisms of water exchange between lanthanide(III) aqua ions [Ln(H2O)n]3+ and bulk water: a molecular dynamics simulation approach including high-pressure effects 1996 ·Infoscience (Ecole Polytechnique Fédérale de Lausanne) ·(unknown), (unknown), Lothar Helm, (unknown)	1
17	A change in coordination number from nine to eight along the lanthanide(III) aqua ion series in solution: a neutron diffraction study 1995 ·New Journal of Chemistry ·C. COSSY, Lothar Helm, D. Hugh Powell, André E. Merbach	101
18	Monte Carlo simulations of the tripositive lanthanide ions in aqueous solution 1993 ·New Journal of Chemistry ·(unknown), José M. Lluch, António Oliva, Juan Bertrán, (unknown), Lothar Helm, André E. Merbach	21
19	Structure and dynamics of lanthanide(III) ions in solution: a neutron scattering contribution 1991 ·European Journal of Solid State and Inorganic Chemistry ·Lothar Helm, A.E. Merbach	41
20	Water Exchange on Hexaaquavanadium(III): a Variable‐Temperature and Variable‐Pressure¹⁷O‐NMR Study at 1.4 and 4.7 Tesla 1985 ·Helvetica Chimica Acta ·(unknown), Lothar Helm, André E. Merbach	102

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