Synthesis and Crystal Structure of Hexakis(imidazole) nickel (II) O,O′-diphenyldithiophosphate [Ni(Im)6](Ph2O2PS2)2
The crystal and molecular structures of [Ni(Im)6](dtp)2 (Im = imidazole, dtp = O,O′-diphenyldithiophosphate) have been determined by X-ray crystallography. It crystallizes in the triclinic system, space group Pī, with cell parameters a = 9.375 (2), b = 12.324(3), c = 13.285(3) Å, α = 107.86(3), β = 102.28(3), γ = 109.24(3), and Z = 1. The crystal structure of the title compound is built up of discrete monomeric molecules of [Ni(Im)6](dtp)2. The nickel (II) ion is hexacoordinated by six imidazole molecules and the coordination environment of Ni (II) is of octahedral geometry. In the solid state, a network of N-H∙∙∙S intermolecular hydrogen bonds connect the Ni(Im)6 moieties and O,O′-diphenyl- dithiophosphate molecules, forming a three-dimensional structure.
Cobalt(II), nickel(II), and copper(II) complexes of imidazole and thiazole
The preparation and spectral and magnetic properties are reported for the complexes of the type Co(imidazole)6X2 and Ni(imidazole)6X2(X = Cl, Br, l, or NO3) and Cu(imidazole)4X2(X = Cl or NO3). These compounds have octahedral or distorted octahedral structures whereas the compounds Co(imidazole)2Cl2 and di-imidazolatocobalt(II) are tetrahedral. The “inner” complex di-imidazolatonickel(II) has a square-planar structure. The thiazole complexes Ni(thiazole)4Cl2, Co(thiazole)2Cl2, and Cu(thiazole)2Cl2 are described and are shown to have essentially octahedral structures.
Recovering the frontier state : war, ethnicity, and state in Afghanistan
Chapter 1 Table of Contents Chapter 2 1 Introduction Chapter 3 2 Ethnicity, Political Power, and Fragmentation Chapter 4 3 Rise of the Taliban and Civil War Chapter 5 4 The United States and War on Terrorism Chapter 6 5 Restructuring the Afghan State Chapter 7 6 Political Economy of Drugs and Warlordism Chapter 8 7 Afghanistan and Neighboring States Chapter 9 8 Conclusion Chapter 10 Bibliography