Metal-ligand bond lengths and strengths: are they correlated? A detailed CSD analysis

Structure data on metal-alkoxides, metal-alcohol, metal-carboxylates, metal-carboxylic acid, metal-azolate and metal-azole coordination compounds from the Cambridge Structural Database (CSD) were analysed in terms of bond lengths. In general the anionic ligands form shorter metal-ligand bonds by about 0.02-0.05 angstrom compared to neutral ligands, a clear indication of a charge contribution to the bonding interactions. This small difference is not, however, deemed as sufficient to generate two distinct classes of metal-ligand bonding. Instead, the anionic ligands can be viewed as having "charge assisted" metal-ligand bonding, corresponding to the same term used for "charge-assisted hydrogen bonding"

Row 7 of the periodic table complete: Can we expect more new elements; and if so, when?

In this perspective the impact of the completion of the 7th row up to Z = 118, by the addition of four new elements in the periodic table - nihonium, moscovium, tennessine and oganesson - is described. Also the methods of how to "synthesize" new chemical elements, and the methods and difficulties of verifying such new elements are briefly discussed. Some speculations are presented about possible new element discoveries in the coming years.Finally, the pathway of how the IUPAC names of the new elements are determined, are presented and illustrated by the most recent 4 additions of new elements. (C) 2017 The Author. Published by Elsevier Ltd.Metals in Catalysis, Biomimetics & Inorganic Material

Fifty years of inorganic biochemistry: developments, trends, highlights, impact and citations

A brief historic overview and analysis is presented of the almost 9000 scientific articles that have appeared in the Journal of Inorganic Biochemistry (JIB) and its predecessor (Bioinorganic Chemistry), since 1973. This overview has a focus on the different topics, in particular on the different elements of the Periodic Table and on papers that have received very large numbers of citations. Over the whole period, copper has been the element occurring in most publications (almost 1800, which is 20%), followed by iron which occurs in some 12% of all papers. Other favorite elements are zinc, platinum and ruthenium. The worldwide origin of papers published in JIB has been analyzed as well, showing a quite evenly worldwide distribution, with just a few exceptions. Trends in selected scientific topics over time (first 10 years; last 25 years, last 10 years) are also discussed. Also authors and institutes with the largest number of papers published in JIB have been detected. The numerical information is based on an analysis of the Web of Science with a cutoff date around July 1, 2020.Metals in Catalysis, Biomimetics & Inorganic Material

M’n M’s

ter gelegenheid van zijn afscheid als hoogleraar in de Anorganische Chemie aan de Universiteit Leiden op vrijdag 30 oktober 2009Metals in Catalysis, Biomimetics & Inorganic Material

Review of Sigel, A.; Freisinger, E.; Sigel, R.K.O. (2021) Metal ions in bio-imaging techniques

Metals in Catalysis, Biomimetics & Inorganic Material

Interaction between the DNA model base 9-ethylguanine and a group of ruthenium polypyridyl complexes: Kinetics and conformational temperature dependence

The binding capability of three ruthenium polypyridyl compounds of structural formula [Ru(apy)(tpy)Ln-](ClO4)((2-n)) [1a-c; apy = 2,2'-azobis(pyridine), tpy = 2,2':6',2 ''-terpyridine, L = Cl, H2O, CH3CN] to a fragment of DNA was studied. The interaction between each of these complexes and the DNA model base 9-ethylguanine (9-EtGua) was followed by means of H-1 NMR studies. Density functional theory calculations were carried out to explore the preferential ways of coordination between the ruthenium complexes and guanine. The ruthenium-9-EtGua adduct formed was isolated and fully characterized using different techniques. A variable-temperature H-1 NMR experiment was carried out that showed that while the 9-EtGua fragment was rotating fast at high temperature, a loss of symmetry was suffered by the model base adduct as the temperature was lowered, indicating restricted rotation of the guanine residue

Pyrazoles and imidazoles as ligand: XIX. Complex formation between imidazole and nickel(II) salts

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