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Ruthenium Complexes: Photochemical and Biomedical Applications

ISBN: 978-3-527-33957-0
344 pages
January 2018
Ruthenium Complexes: Photochemical and Biomedical Applications (3527339574) cover image


Edited by a team of highly respected researchers combining their expertise in chemistry, physics, and medicine, this book focuses on the use of ruthenium-containing complexes in artificial photosynthesis and medicine.
Following a brief introduction to the basic coordination chemistry of ruthenium-containing complexes and their synthesis, as well as their photophysical and photochemical properties, the authors discuss in detail the major concepts of artificial photosynthesis and mechanisms of hydrogen production and water oxidation with ruthenium. The second part of the text covers biological properties and important medical applications of ruthenium-containing complexes as therapeutic agents or in diagnostic imaging.
Aimed at stimulating research in this active field, this is an invaluable information source for researchers in academia, health research institutes, and governmental departments working in the field of organometallic chemistry, green and sustainable chemistry as well as medicine/drug discovery, while equally serving as a useful reference also for scientists in industry.
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Table of Contents


About the Editors xv

Preface xvii

Acknowledgments xix

Section I Introduction 1

1 Karen J. Brewer (1961–2014): A Bright Star that Burned Out Far Too Soon 3
Seth C. Rasmussen

1.1 Introduction 3

1.2 Early Years 4

1.3 Graduate Studies and Clemson University 6

1.4 Postdoctoral Research and the University of California, Berkeley 11

1.5 Washington State University: Beginning an Independent Career 13

1.6 Move to Virginia Tech 15

1.7 Collaboration with BrendaWinkel and the Study of Metal-DNA Interactions 16

1.8 A Return to Where It All Started: Photochemical H2 Production 18

1.9 A Career Cut Tragically Short 19

1.10 Karen’s Legacy 20

Acknowledgments 20

References 20

2 Basic Coordination Chemistry of Ruthenium 25
Mark A.W. Lawrence, Jimmie L. Bullock, and Alvin A. Holder

2.1 Coordination Chemistry of Ruthenium 25

2.1.1 The Element 25

2.1.2 Stereochemistry and Common Oxidation States 26 Ruthenium in Low Oxidation States 27 Chemistry of Ruthenium(II) and (III) 31 Higher Oxidation States of Ruthenium 36

2.1.3 Conclusion 37

References 37

Section II Artificial Photosynthesis 43

3 Water Oxidation Catalysis with Ruthenium 45
Andrea Sartorel

3.1 Introduction 45

3.1.1 Energy Issue and Energy from the Sun 45

3.1.2 Photosynthesis and Solar Fuels 46

3.1.3 Water Oxidation 48

3.1.4 ArtificialWater Oxidation 49

3.2 Ruthenium inWater Oxidation Catalyst 50

3.2.1 Ruthenium Oxide 50

3.2.2 Molecular Ruthenium WOC 52 Meyer’s Blue Dimer 53 The Ru-Hbpp Catalyst 54 Single-Site Ru-WOCs 55 Heptacoordinated Ru Intermediates 56

3.2.3 Polyoxometalates: The Bridge Between Metal Oxides and Coordination Complexes 57

3.3 Conclusions and Perspectives 60

References 61

4 Ruthenium- and Cobalt-Containing Complexes and Hydrogenases for Hydrogen Production 67
Michael J. Celestine, Raj K. Gurung, and Alvin A. Holder

4.1 Introduction 67

4.2 (A) Ruthenium- and Cobalt-Containing Complexes for Hydrogen Production 68

4.2.1 Nonbridged Systems 68

4.2.2 Bridged Systems 70

4.3 (B) Ruthenium(II)-Containing Complexes and Hydrogenases for Hydrogen Generation in Aqueous Solution 77

4.3.1 Hydrogenases 77

4.3.2 Hydrogenases with Ruthenium(II) Complexes 78

4.4 Conclusions 84

References 85

Section III Applications in Medicine 89

5 Ligand Photosubstitution Reactions with Ruthenium Compounds: Applications in Chemical Biology and Medicinal Chemistry 91
Samantha L. Hopkins and Sylvestre Bonnet

5.1 Introduction 91

5.2 Caging and Uncaging Biologically Active Ligands with a Nontoxic Ruthenium Complex 92

5.3 Caging Cytotoxic Ruthenium Complexes with Organic Ligands 96

5.4 Low-Energy Photosubstitution 100

5.4.1 Introduction 100

5.4.2 Modulating Ru Photophysics by Ligand Modulation 100

5.4.3 Upconversion (UC) 105 Triplet–Triplet Annihilation Upconversion 105 Upconverting Nanoparticles (UCNPs) 106 Two-Photon Absorption (TPA) Photosubstitution 109

5.5 Conclusions 110

References 111

6 Use of Ruthenium Complexes as Photosensitizers in Photodynamic Therapy 117
Lothar Lilge

6.1 Introduction 117

6.2 The Basics of PhotodynamicTherapy 118

6.2.1 Singlet Oxygen Production 120

6.2.2 Other Radical Production 120

6.2.3 PDT Dose Definition 120 PDT Dosimetry In Vitro 122 PDT Dosimetry In Vivo 124 Oxygen Consumption Model 125 In Vivo Tissue Response Models 125

6.2.4 PDT and Immunology 126

6.3 Status of Ru Photosensitizing Complexes 126

6.3.1 Photostability for Ru-PS Complexes 128

6.3.2 LongWavelength Activation of Ru(II)-PS Complexes 128

6.4 Issues to Be Considered to Further Develop Ru-Based Photosensitizers 129

6.4.1 Subcellular Localization 130

6.4.2 Ruthenium Complex Photosensitizers and the Immune Response 131

6.5 Future Directions for Ru-PS Research 131

6.6 Conclusion 132

References 132

7 Photodynamic Therapy in Medicine with Mixed-Metal/Supramolecular Complexes 139
Jimmie L. Bullock and Alvin A. Holder

7.1 Introduction 139

7.2 Platinum and Rhodium Centers as Bioactive Sites 140

7.2.1 Platinum(II)-Based Chemotherapeutics 140

7.2.2 Rhodium(III) as a Bioactive Site 141

7.3 Supramolecular Complexes as DNA Photomodification Agents 142

7.4 Mixed-Metal Complexes as PhotodynamicTherapeutic Agents 143

7.4.1 Photosensitizers with a Ru(II)Metal Center Coupled to Pt(II) Bioactive Sites 143 Binuclear Complexes with Ru(II) and Pt(II)Metal Centers with Bidentate Ligands 143 Binuclear and Trinuclear Complexes with Ru, Pt with Tridentate Ligands 146

7.4.2 Photosensitizers with a Ru(II) Metal Center Coupled to Rh(III) Bioactive Sites 147 Trinuclear Complexes with Ru(II), Rh(III), and Ru(II) Metal Centers 147 Binuclear Complexes with Ru(II) and Rh(III) Metal Centers 149

7.4.3 Photosensitizers with a Ru(II) Metal Cenetr Coupled to Other Bioactive Sites 150 Binuclear Complexes with Ru(II) and Cu 150 Binuclear Complexes with Ru(II) and Co(III) Metal Centers 151 Binuclear Complexes with Ru (II) and V(IV) Metal Centers 151 Applications of Ru(II) Metal Centers in Nanomedicine 152

7.5 Summary and Conclusions 155

Abbreviations 156

References 157

8 Ruthenium Anticancer Agents En Route to the Tumor: From Plasma Protein Binding Agents to Targeted Delivery 161
Muhammad Hanif and Christian G. Hartinger

8.1 Introduction 161

8.2 Protein Binding RuIII Anticancer Drug Candidates 163

8.2.1 RuIII Anticancer Drug Candidates Targeting Primary Tumors 163

8.2.2 Antimetastatic RuIII Compounds 165

8.3 Functionalization of Macromolecular Carrier Systems with Ru Anticancer Agents 166

8.3.1 Proteins as Delivery Vectors for Organometallic Compounds 166

8.3.2 Polymers and Liposomes as Delivery Systems for Bioactive Ruthenium Complexes 168

8.3.3 Dendrimers 169

8.4 Hormones, Vitamins, and Sugars: Ruthenium Complexes Targeting Small Molecule Receptors 169

8.5 Peptides as Transporters for Ruthenium Complexes into Tumor Cells and Cell Compartments 173

8.6 Polynuclear Ruthenium Complexes for the Delivery of a Cytotoxic Payload 174

8.7 Summary and Conclusions 175

Acknowledgments 175

References 176

9 Design Aspects of Ruthenium Complexes as DNA Probes and Therapeutic Agents 181
Madeleine De Beer and Shawn Swavey

9.1 Introduction 181

9.2 Physical Interaction to Disrupt DNA Structure 181

9.2.1 Irreversible Covalent Binding 182

9.2.2 Intercalation 184

9.2.3 Additional Noncovalent Binding Interactions 185

9.3 Biological Consequences of Ru-Complex/DNA Interactions 186

9.4 Effects of Ru Complexes on Topoisomerases and Telomerase 191

9.5 Summary and Conclusions 196

References 197

10 Ruthenium-Based Anticancer Compounds: Insights into Their Cellular Targeting andMechanism of Action 201
AntónioMatos, FilipaMendes, Andreia Valente, Tânia Morais, Ana Isabel Tomaz, Philippe Zinck, Maria Helena Garcia, Manuel Bicho, and Fernanda Marques

10.1 Introduction 201

10.2 Cellular Uptake 204

10.3 DNA and DNA-Related Cellular Targets 205

10.4 Targeting Signaling Pathways 207

10.5 Targeting Enzymes of Specific Cell Functions 207

10.6 Targeting Glycolytic Pathways 209

10.7 Macromolecular Ruthenium Conjugates: A New Approach to Targeting 211

10.8 Conclusions 214

References 215

11 Targeting cellular DNA with Luminescent Ruthenium(II) Polypyridyl Complexes 221
Martin R. Gill and Jim A. Thomas

11.1 Introduction 221

11.1.1 DNA-Binding Modes of Small Molecules 222

11.1.2 Metal Complexes and DNA 223

11.2 [Ru(bpy)2(dppz)]2+ and the DNA “Light-Switch” Effect 224

11.3 Cellular Uptake of RPCs and Application as DNA-Imaging Agents 226

11.3.1 Mononuclear Complexes 226

11.3.2 Dinuclear Complexes 228

11.3.3 Cyclometalated Systems 228

11.4 Alternative Techniques to Assess Cellular Uptake and Localization 231

11.5 TowardTheranostics: luminescent RPCs as Anticancer Therapeutics 232

11.6 Summary and Conclusions 234

References 235

12 Biological Activity of Ruthenium ComplexesWith Quinoline Antibacterial and Antimalarial Drugs 239
Jakob Kljun and Iztok Turel

12.1 Introduction 239

12.2 Antibacterial (Fluoro)quinolones 240

12.2.1 Quinolones and Their Interactions with Metal Ions 241

12.2.2 Ruthenium and Quinolones 241

12.2.3 Ruthenium and HIV Integrase Inhibitor Elvitegravir 245

12.3 Antibacterial 8-Hydroxyquinolines 246

12.3.1 Mode of Action of 8-Hydroxyquinoline Agents 246

12.3.2 Ruthenium and 8-Hydroxyquinolines 247

12.4 Antimalarial 4-Aminoquinolines 248

12.4.1 Mechanism of Action of Antimalarial Quinoline Agents 248

12.5 Metallocene Analogues of Chloroquine 249

12.6 Conclusions 252

References 252

13 Ruthenium Complexes as NO Donors: Perspectives and Photobiological Applications 257
Loyanne C.B. Ramos, Juliana C. Biazzotto, Juliana A. Uzuelli, Renata G. de Lima, and Roberto S. da Silva

13.1 Introduction 257

13.2 Photochemical Processes of Some Nitrogen Oxide Derivative–Ruthenium Complexes 258

13.2.1 Metal-Ligand Charge-Transfer Photolysis of {Ru-NO}6 258

13.2.2 Nitrosyl Ruthenium Complexes: Visible-Light Stimulation 261

13.3 Photobiological Applications of Nitrogen Oxide Compounds 265

13.3.1 Photovasorelaxation 265

References 268

14 Trends and Perspectives of Ruthenium Anticancer Compounds (Non-PDT) 271
Michael A. Jakupec,Wolfgang Kandioller, Beatrix Schoenhacker-Alte, Robert Trondl,Walter Berger, and Bernhard K. Keppler

14.1 Introduction 271

14.2 Ruthenium(III) Compounds 272

14.2.1 NAMI-A 273 Biotransformation 273 Antimetastatic Activity 274 Mode of Action 274 Clinical Studies and Perspectives 275

14.2.2 KP1019/NKP-1339 276 Tumor TargetingMediated by Plasma Proteins 276 Activation by Reduction 277 Mode of Action 278 Clinical Studies and Perspectives 281

14.3 Organoruthenium(II) Compounds 282

14.3.1 Ruthenium(II)–Arene Compounds in Preclinical Development 282 Organoruthenium Complexes Bearing Bioactive Ligand Scaffolds 284 Cytotoxic Organoruthenium Complexes without Activation by Aquation 285

References 286

15 Ruthenium Complexes as Antifungal Agents 293
Claudio L. Donnici,Maria H. Araujo, and Maria A. R. Stoianoff

15.1 Introduction 293

15.2 Antifungal Activity Investigations of Ruthenium Complexes 304

15.2.1 Ruthenium Complexes with Activity against Several Pathogenic Fungi Species: Dinuclear, Trinuclear, and Tetranuclear ruthenium Polydentate Polypyridil ligands, Heterotrimetallic di-Ruthenium-Mono-Palladium Complexes, Dinuclearbis-β-Diketones and Pentadithiocarbamate Ligands 304

15.2.2 Aromatic and Heteroaromatic Ligands in Ru Monometallic Centers (Pyridine, Phenantroline, Terpyridine, Quinoline, and Phenazine) 305

15.2.3 Schiff bases, Thiosemicarbazones, and Chalcones 307 Schiff bases (Tetradentate Salen Like, Tridentate, and bidentate) 307 Thiosemicarbazones 309 Chalcone Derivatives 310

15.2.4 Other ligands (Dithio-Naphtyl-Benzamide, Arylazo, Catecholamine, Organophosphorated, Hydridotris(pyrazolyl)borate and Bioactive Azole Ligands) 310

15.3 Conclusion 312

References 313

Index 319

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Author Information

Alvin A. Holder is an associate professor at Old Dominion University in Norfolk, U.S.A. He graduated from the University of the West Indies, Barbados, with a B.Sc. and acquired his Ph.D. in inorganic chemistry with Prof. Tara P. Dasgupta. He was a faculty member at the University of the West Indies, Cave Hill Campus, Barbados, and an assistant professor in chemistry at the University of Southern Mississippi. His current research involves transition metal chemistry and he has published more than 60 articles and several textbooks and book chapters. In 2012, he was awarded an NSF Career Award.

Lothar Lilge is a senior scientist at the Princess Margaret Cancer Centre and holds a professorship at the University of Toronto, Canada. He obtained his Diploma in physics from the Johann Wolfgang Goethe University in Frankfurt, Germany, and his Ph.D. degree in biophysics from the Westfaehlische Wilhelms University in Muenster, Germany. Additional training was provided through the Wellman Laboratories of Photomedicine at Massachusetts General Hospital, Boston, U.S.A., and during a post-doc at McMaster University in Hamilton, Canada. His work is focused on photodynamic therapy including the use of ruthenium-based photosensitizers and optical spectroscopy for diagnostic and risk assessment among a range of other biophotonic application in medicine.

Wesley R. Browne is an associate professor at Stratingh Institute for Chemistry at the University of Groningen, The Netherlands, since 2013. He completed his Ph.D. degree at Dublin City University, Ireland, with Prof. J. G. Vos in 2002, followed by a postdoc under the joint guidance of Prof. J. G. Vos and Prof. J. J. McGarvey, Queens University Belfast, U.K. Between 2003 and 2007 he was a postdoctoral research fellow in the group of Prof. B. L. Feringa at the University of Groningen. He was appointed assistant professor in 2008. His current research interests include transition metal based oxidation catalysis, electrochromic materials and responsive surfaces. He is an advisory board member for the European Journal of Inorganic Chemistry, Particle & Particle Characterization (both Wiley) and Chemical Communications (RSC). He has (co-)authored over 150 research papers, reviews and book chapters.

Mark A. W. Lawrence was a post-doctoral fellow at Old Dominion University in Norfolk, U.S.A., in the group of Prof. A. Holder. He received his B.Sc. degree in 2006 and his Ph.D. degree in inorganic-physical chemistry in 2011 from the University of the West Indies (UWI), Mona Campus, Jamaica, with Prof. Tara P. Dasgupta. His research interests include synthesis of hydrazones and functionalized pyridyl benzothiazoles, their transition metal complexes and application to catalysis and biological processes.

Jimmie L. Bullock Jr. is a Ph.D. student at the University of Kentucky in Lexington, U.S.A. in the department of Chemistry. He received his B.Sc. degree from Longwood University, Farmville, U.S.A. and his M.S. degree in biological inorganic chemistry from Old Dominion University, Norfolk, U.S.A., in 2013 and 2016, respectively. His research interests include studying activation of signaling pathways induced by non-platinum based chemotherapeutic agents and synthesis of lanthanide sensor molecules.

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