A brief introduction to transition metals in unusual oxidation states

All‐Metallic Zn=Zn Double‐π Bonded Octahedral Zn2M4 (M=Li, Na) Clusters with Negative Oxidation State of Zinc

“…One metal with negative oxidation state is mainly found in their carbonyl complexes or metal-rich compounds. [32][33][34][35][36] Prior to this, the negative oxidation state of Zn was only proposed in a metal-rich Ca 5 Zn 3 compound to our knowledge, [37] wherein Zn atoms present two different environments, [ZnÀ Zn] 4À dimer and isolated [Zn] 2À , with 3d 10 4s 2 4p 2 configuration. In D 4h À Zn 2 M 4 , the Zn atom's 4p orbitals are also successfully occupied by two electrons and hence it can also be regarded as the category of negative oxidation state of ZnÀ Zn chemical bonding action with a form of [Zn=Zn] 4À double-π bond.…”

Chemical and spectroscopic characterizations, ESI-QTOF mass spectrometric measurements and DFT studies of new complexes of palladium(II) with tryptamine and mefenamic acid

“…The 15 N NMR chemical shifts for tra and the Pd-tra complex were indirectly detected in the solution-state by a { 15 N, 1 …”

“…Due to the vast field of applications, metal complexes have been extensively investigated for a long time in many research areas, including bioinorganic and medicinal chemistry [1,2]. The use of metals and their derivatives for the treatment of several diseases remotes from the middle ages, with emphasis on the application of silver and gold compounds as antibacterial agents.…”

Evaluation of antioxidant and antiproliferative activities of 1,2‐bis (p‐amino‐phenoxy) ethane derivative Schiff bases and metal complexes

“…Therefore, various investigations on Schiff bases and their derivatives could be found in the literature. Research has also shown that Schiff bases exhibit anticancer properties with different heterocyclic structures …”