An advanced-level textbook of inorganic chemistry for the graduate (B.Sc) and postgraduate (M.Sc) students of Indian and foreign universities. Published online: 09 Apr 2020. The understanding of metal-metal bonding that developed as a result of the discovery of multiple metal-metal bonding awakened a new chemistry involving metal clusters. Yang, D.-G. Huang, in Modern Inorganic Synthetic Chemistry (Second Edition), 2017. The focus of this perspective concerns progress on activation and transformation of important inorganic and organic molecules by negatively charged metal clusters. The metal cluster anions cover bare metal clusters as well as ligated systems with oxygen, carbon, and nitrogen, among others. Article. 9.1.3 The Oxo Clusters. Multiple metal-metal bonding now is known to permeate broad areas of transition metal chemistry. Pages: 1-11. Clusters were defined by Cotton to be species containing metal-metal bonding. Investigation of photocatalytic behavior of undoped ZnO and Cr-doped ZnO nanoparticles for the degradation of dye. Metal cluster chemistry is at the cutting edge between molecular and solid-state chemistry and has therefore had a great impact on the researchers working on organic, coordination, and solid-state chemistry, catalysis, physics, and materials science. Besides, although the large number of triatomic clusters studied here could well present the potential universality of such an “outlaw” phenomenon in inorganic metal clusters, more detailed research that would consider more doping elements is still urgently needed to aid in gaining more and complete understanding about such striking phenomena. Inorganic and Nano-Metal Chemistry, Volume 51, Issue 1 (2021) Articles . Some applications are described for understanding and designing of inorganic molecules. Small Molecule Complexes. . Falak Naz & Khalid Saeed. . G.-Y. The development of new sophisticated synthetic techniques has led to enormous progress in the synthesis of this diverse class of compounds. A chemical orbital theory is useful in inorganic chemistry. In cluster chemistry, the oxo clusters are usually generated by combination of central atoms and oxygen ligands with three forms: the O 2− anion, OH − group, and O-donor of ligands, while the central atoms include nonmetals and metals. Two or three atomic molecules, such as H 2, N 2, CO, NO, CO 2, NO 2, and H 2 O, SO 2, etc., are called small molecules and the chemistry of their complexes is very important not only for basic inorganic chemistry but also for catalyst chemistry, bioinorganic chemistry, industrial chemistry, and environmental chemistry.