Giant hexagonal bilayer hemoglobins

Article Abstract:

The hexagonal bilayer hemoglobins (Hbs) and chlorocruorins are heteromultimeric complexes containing four to six different globin chains. The annelid and vestimentiferan hexagonal bilayer structures have a bracelet model with 12 globular substructures. The transition of Lumbricus Hb from oxy to deoxy state shows very small alteration in shape. The ligand binding to calcium and magnesium ions fails to alter the stereochemistry of the heme iron-proximal His bond. Hexagonal Hb is important for multiprotein and multienzyme complexes due to globin-linker interactions.

Research, Hemoglobin, Hemoglobins

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The compleat coordination chemistry-one practioner's perspective

Article Abstract:

The development and the expansion of the scope of coordination chemistry are traced and its future prospects are discussed. Coordination chemistry is significant because of its capacity to predict the existence of higher levels of molecular organization in the design of molecules and complicated molecular systems. Its main concern then is only on the concept of cation core-focused model and later on coordination polyhedron but its studies now include molecular species formed by binding interactions and coordination entity.

Models, Forecasts and trends, Molecular structure, Chemistry, Physical and theoretical, Physical chemistry

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Recent advances in poly(pyrazolyl)borate (scorpionate) chemistry

Article Abstract:

A review of the literature on poly(pyrazolyl)borate (1) from 1984 to early 1993 is presented. The fundamental feature of (1) complexes is the six membered ring which resembles the claws of a scorpio, thus the complexes are called scorpionate complexes. Recent advances on the scorpionates include their synthetic methodologies, significant features of their complex models, the filling in of the gaps in the periodic table and their characterization.

Organometallic chemistry

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