This book is all about the metal complexes of acyl pyrazolones. It covers the literature survey and introduction about the research in this field followed by the synthetic procedure, spectroscopic characterization using various spectroscopic and analytical techniques and x-ray single crystal characterization of the synthesized metal complexes of acyl pyrazolone ligands synthesized by us. As the acyl pyrazolone is very important class of heterocyclic compounds having applications in diverse filed, this book will be helpful to researchers working in this area.