1. The Infinite Linear Chain Compounds Hg3-? AsF6 and Hg3-?SbF6.- 1. History and Introduction.- 2. Chemistry.- 3. Room-Temperature Structure (D Phase).- 4. Structure-Related Properties.- 5. Electrical Resistivity.- 6. Low-Temperature Structure: Ordering of the Mercury Chains.- 7. Dynamical Properties.- 8. Superconducting Properties.- 9. Electron Properties.- 10. Summary.- Notation.- References.- 2. The Synthesis and Static Magnetic Properties of First-Row Transition-Metal Compounds with Chain Structures.- 1. Introduction.- 2. Chain Compounds of Titanium.- 3. Chain Compounds of Vanadium.- 4. Chain Compounds of Chromium.- 5. Chain Compounds of Manganese.- 6. Chain Compounds of Iron.- 7. Chain Compounds of Cobalt.- 8. Chain Compounds of Nickel.- 9. Chain Compounds of Copper.- 10. Summary.- Notation.- References.- 3. Ferromagnetism in Linear Chains.- 1. Introduction.- 2. Background.- 3. Synthetic Strategies.- 4. Magneto-Structural Correlations in Dimeric Systems.- 5. Theoretical Predictions.- 6. Recent Progress in Ferromagnetic Linear Chain Systems.- Notation.- References.- 4. Magnetic Resonance in Ion-Radical Organic Solids.- 1. Introduction.- 2. Triplet Spin Excitons: Dimerized Ion-Radical Stacks.- 3. Charge-Transfer Complexes with Mixed Regular Stacks.- 4. NMR Studies of Ion-Radical Solids.- 5. Paramagnetism of Ion-Radical Solids.- 6. Discussion.- Notation.- References.- 5. Salts of 7,7,8,8-Tetracyano-p-quinodimethane with Simple and Complex Metal Cations.- 1. Introduction.- 2. Alkali and Ammonium Salts of 7,7,8,8-Tetracyano-p-quinodimethane.- 3. 7,7,8,8-Tetracyano-q-quinodimethane Salts of Other Simple Metal Ions.- 4. 7,7,8,8-Tetracyano-p-quinodimethane Salts of Metal Complexes and Organometallic Compounds.- 5. Applications.- 6. Summary.- Notation.- References.- 6.Linear Chain 1,2-Dithiolene Complexes.- 1. Introduction.- 2. Chemistry of the 1,2-Dithiolene Ligand and Its Linear Complexes.- 3. Molecular and Electronic Structures of Metal 1,2-Dithiolene Complex Molecules.- 4. Linear Chains of Metal 1,2-Dithiolene Complex Molecules.- 5. Conclusions.- Notation.- References.- 7. The Spin-Peierls Transition.- 1. Introduction.- 2. Theory of the Spin-Peierls Transition.- 3. Experimental Systems.- 4. Conclusions and Summary.- Notation.- References.- 8. Polypyrrole: An Electrochemical Approach to Conducting Polymers.- 1. Introduction.- 2. PyrroleBlack.- 3. Electrochemical Preparation of Polypyrrole.- 4. Free-Standing Films.- 5. Electrochemical Properties of Thin Films.- 6. N-Substituted Polypyrroles.- 7. AnionVariation.- 8. Applications.- References.- 9. Compendium of Synthetic Procedures for One-Dimensional Substances.- 1. Introduction.- 2. Organic Materials.- 3. Inorganic Materials.- 4. Polymeric Materials.- References.- 10. Structural, Magnetic, and Charge Transport Properties of Stacked Metal Chelate Complexes.- 1. Introduction.- 2. Integrated Stack Crystals.- 3. Segregated Stack Crystals, Integral Oxidation State Metal Complexes.- 4. Segregated Stack Crystals, Nonintegral Oxidation State Metal Complexes.- 5. Future Directions.- References.