Ionel Haiduc is Professor Emeritus at Babes-Bolyai University in Cluj-Napoca, Romania. A distinguished chemist and prolific researcher, he has published over 340 journal articles and authored several books including The Chemistry of Inorganic Ring Systems (1970), Basic Organometallic Chemistry (1985), The Chemistry of Inorganic Homo- and Heterocycles (1987), Organometallics in Cancer Chemotherapy (1990), and Supramolecular Organometallic Chemistry (1999). He is a member of the Romanian Academy (former President from 2006 to 2014) and the Academia Europea (London), as well as an honorary or correspondent member of Göttingen Academy of Sciences and Humanities, Hungarian Academy of Sciences, Academy of Sciences of Moldova, and Montenegrin Academy of Sciences.Edward R.T. Tiekink is Distinguished Professor and Head of the Research Centre for Crystalline Materials at Sunway University, Malaysia. He is a graduate of the University of Melbourne, Australia (D.Sc. 2006), where his passion for structural chemistry was nurtured. He has published in excess of 2,000 research papers/reviews and co-edited a number of books reflecting his interests in crystallography and metal-based drugs, including Metallotherapeutic Drugs and Metal-Based Diagnostic Agents: The Use of Metals in Medicine (2005), Frontiers in Crystal Engineering (2006), Organic Crystal Engineering—Frontiers in Crystal Engineering (2010), and Multi-Component Crystals: Synthesis, Concepts, Function (2017). He is a Fellow of the Royal Society of Chemistry and the Royal Australian Chemical Institute.

• 1. INTRODUCTION1.1 Defining the concept1.2 Knowing the history2. MONOATOMIC INVERSE COORDINATION CENTRES2.1 Triangular complexes2.1.1 Single-atom bridging linkers2.1.2 Two-atom bridging linkers2.1.3 Three-atom bridging linkers2.2 Tetrahedral complexes2.2.1 Single-atom bridging linkers2.2.2 Two-atom bridging linkers2.2.3 Three-atom bridging linkers2.3 Planar complexes2.3.1 Trigonal-bipyramidal and square-pyramidal complexes2.3.2 Octahedral complexes2.3.3 Linker-free complexes3. POLYATOMIC INVERSE COORDINATION CENTRES3.1 Polynitrogen as the inverse coordination centre3.1.1 Trinitrogen3.1.2 Dinitrogen3.2 Naked phosphorus as the inverse coordination centre3.2.1 Nonaphosphorus and larger Pn groups3.2.2 Octaphosphorus groups3.2.3 Heptaphosphorus groups3.2.4 Hexaphosphorus groups3.2.5 Pentaphosphorus groups3.2.6 Tetraphosphorus groups3.2.7 Triphosphorus groups3.2.8 Diphosphorus groups4. ORGANIC MOLECULES AS INVERSE COORDINATION CENTRES4.1 Nitrogen heterocycles as inverse coordination centre4.1.1 Miscellaneous4.1.2 Bicyclic molecules4.1.3 Six-membered heterocycles4.2 Fused-ring systems as inverse coordination centres4.3 Saturated six-membered rings as inverse coordination centres4.3.1 Tricyclic species4.3.2 Bicyclic species4.3.3 Monocyclic species4.4 Five-membered rings as inverse coordination centres4.4.1 Fused five-membered rings4.4.2 Tetrazole4.4.3 Triazole4.4.4 Biimidazole4.4.5 Imidazole4.4.6 Pyrazole4.5 Carboxylates as inverse coordination centres4.6 Oxocarbons as inverse coordination centres4.7 Oxalate as an inverse coordination centre, and nitrogen and sulphur analogues4.8 Organophosphanes as inverse coordination centres4.9 Thiolates and sulphides as inverse coordination centresReferencesIndex

Ionel Haiduc is Professor Emeritus at Babes-Bolyai University in Cluj-Napoca, Romania. A distinguished chemist and prolific researcher, he has published over 340 journal articles and authored several books including The Chemistry of Inorganic Ring Systems (1970), Basic Organometallic Chemistry (1985), The Chemistry of Inorganic Homo- and Heterocycles (1987), Organometallics in Cancer Chemotherapy (1990), and Supramolecular Organometallic Chemistry (1999). He is a member of the Romanian Academy (former President from 2006 to 2014) and the Academia Europea (London), as well as an honorary or correspondent member of Göttingen Academy of Sciences and Humanities, Hungarian Academy of Sciences, Academy of Sciences of Moldova, and Montenegrin Academy of Sciences.Edward R.T. Tiekink is Distinguished Professor and Head of the Research Centre for Crystalline Materials at Sunway University, Malaysia. He is a graduate of the University of Melbourne, Australia (D.Sc. 2006), where his passion for structural chemistry was nurtured. He has published in excess of 2,000 research papers/reviews and co-edited a number of books reflecting his interests in crystallography and metal-based drugs, including Metallotherapeutic Drugs and Metal-Based Diagnostic Agents: The Use of Metals in Medicine (2005), Frontiers in Crystal Engineering (2006), Organic Crystal Engineering—Frontiers in Crystal Engineering (2010), and Multi-Component Crystals: Synthesis, Concepts, Function (2017). He is a Fellow of the Royal Society of Chemistry and the Royal Australian Chemical Institute.

• 1. INTRODUCTION1.1 Defining the concept1.2 Knowing the history2. MONOATOMIC INVERSE COORDINATION CENTRES2.1 Triangular complexes2.1.1 Single-atom bridging linkers2.1.2 Two-atom bridging linkers2.1.3 Three-atom bridging linkers2.2 Tetrahedral complexes2.2.1 Single-atom bridging linkers2.2.2 Two-atom bridging linkers2.2.3 Three-atom bridging linkers2.3 Planar complexes2.3.1 Trigonal-bipyramidal and square-pyramidal complexes2.3.2 Octahedral complexes2.3.3 Linker-free complexes3. POLYATOMIC INVERSE COORDINATION CENTRES3.1 Polynitrogen as the inverse coordination centre3.1.1 Trinitrogen3.1.2 Dinitrogen3.2 Naked phosphorus as the inverse coordination centre3.2.1 Nonaphosphorus and larger Pn groups3.2.2 Octaphosphorus groups3.2.3 Heptaphosphorus groups3.2.4 Hexaphosphorus groups3.2.5 Pentaphosphorus groups3.2.6 Tetraphosphorus groups3.2.7 Triphosphorus groups3.2.8 Diphosphorus groups4. ORGANIC MOLECULES AS INVERSE COORDINATION CENTRES4.1 Nitrogen heterocycles as inverse coordination centre4.1.1 Miscellaneous4.1.2 Bicyclic molecules4.1.3 Six-membered heterocycles4.2 Fused-ring systems as inverse coordination centres4.3 Saturated six-membered rings as inverse coordination centres4.3.1 Tricyclic species4.3.2 Bicyclic species4.3.3 Monocyclic species4.4 Five-membered rings as inverse coordination centres4.4.1 Fused five-membered rings4.4.2 Tetrazole4.4.3 Triazole4.4.4 Biimidazole4.4.5 Imidazole4.4.6 Pyrazole4.5 Carboxylates as inverse coordination centres4.6 Oxocarbons as inverse coordination centres4.7 Oxalate as an inverse coordination centre, and nitrogen and sulphur analogues4.8 Organophosphanes as inverse coordination centres4.9 Thiolates and sulphides as inverse coordination centresReferencesIndex

Ionel Haiduc is Professor Emeritus at Babes-Bolyai University in Cluj-Napoca, Romania. A distinguished chemist and prolific researcher, he has published over 340 journal articles and authored several books including The Chemistry of Inorganic Ring Systems (1970), Basic Organometallic Chemistry (1985), The Chemistry of Inorganic Homo- and Heterocycles (1987), Organometallics in Cancer Chemotherapy (1990), and Supramolecular Organometallic Chemistry (1999). He is a member of the Romanian Academy (former President from 2006 to 2014) and the Academia Europea (London), as well as an honorary or correspondent member of Göttingen Academy of Sciences and Humanities, Hungarian Academy of Sciences, Academy of Sciences of Moldova, and Montenegrin Academy of Sciences.Edward R.T. Tiekink is Distinguished Professor and Head of the Research Centre for Crystalline Materials at Sunway University, Malaysia. He is a graduate of the University of Melbourne, Australia (D.Sc. 2006), where his passion for structural chemistry was nurtured. He has published in excess of 2,000 research papers/reviews and co-edited a number of books reflecting his interests in crystallography and metal-based drugs, including Metallotherapeutic Drugs and Metal-Based Diagnostic Agents: The Use of Metals in Medicine (2005), Frontiers in Crystal Engineering (2006), Organic Crystal Engineering—Frontiers in Crystal Engineering (2010), and Multi-Component Crystals: Synthesis, Concepts, Function (2017). He is a Fellow of the Royal Society of Chemistry and the Royal Australian Chemical Institute.

• 1. INTRODUCTION1.1 Defining the concept1.2 Knowing the history2. MONOATOMIC INVERSE COORDINATION CENTRES2.1 Triangular complexes2.1.1 Single-atom bridging linkers2.1.2 Two-atom bridging linkers2.1.3 Three-atom bridging linkers2.2 Tetrahedral complexes2.2.1 Single-atom bridging linkers2.2.2 Two-atom bridging linkers2.2.3 Three-atom bridging linkers2.3 Planar complexes2.3.1 Trigonal-bipyramidal and square-pyramidal complexes2.3.2 Octahedral complexes2.3.3 Linker-free complexes3. POLYATOMIC INVERSE COORDINATION CENTRES3.1 Polynitrogen as the inverse coordination centre3.1.1 Trinitrogen3.1.2 Dinitrogen3.2 Naked phosphorus as the inverse coordination centre3.2.1 Nonaphosphorus and larger Pn groups3.2.2 Octaphosphorus groups3.2.3 Heptaphosphorus groups3.2.4 Hexaphosphorus groups3.2.5 Pentaphosphorus groups3.2.6 Tetraphosphorus groups3.2.7 Triphosphorus groups3.2.8 Diphosphorus groups4. ORGANIC MOLECULES AS INVERSE COORDINATION CENTRES4.1 Nitrogen heterocycles as inverse coordination centre4.1.1 Miscellaneous4.1.2 Bicyclic molecules4.1.3 Six-membered heterocycles4.2 Fused-ring systems as inverse coordination centres4.3 Saturated six-membered rings as inverse coordination centres4.3.1 Tricyclic species4.3.2 Bicyclic species4.3.3 Monocyclic species4.4 Five-membered rings as inverse coordination centres4.4.1 Fused five-membered rings4.4.2 Tetrazole4.4.3 Triazole4.4.4 Biimidazole4.4.5 Imidazole4.4.6 Pyrazole4.5 Carboxylates as inverse coordination centres4.6 Oxocarbons as inverse coordination centres4.7 Oxalate as an inverse coordination centre, and nitrogen and sulphur analogues4.8 Organophosphanes as inverse coordination centres4.9 Thiolates and sulphides as inverse coordination centresReferencesIndex