Synthesis and characterization of new binuclear boron compounds with bridging guanidinate ligands [Elektronische Ressource] / vorgelegt von Oxana Ciobanu

INAUGURAL-DISSERTATION zur Erlangung der Doktorwürde der Naturwissenschaftlich-Mathematischen Gesamtfakultät der Ruprecht-Karls-Universität Heidelberg Vorgelegt von Master of Science Oxana Ciobanu aus Cluj-Napoca/Romania Tag der mündlichen Prüfung: 20. November 2009 Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands Gutachter: Prof. Dr. Dr. Hans-Jörg Himmel Prof. Dr. Gerald Linti Dedicated to my parents and loving boyfriend Martin Table of contents Table of contents Zusammenfassung 1 Abstract 2 Abbreviations 3 1. Introduction 6 1.1 Addition/elimination of H to the E-E bond of binuclear main group element 6 2compounds 10 1.2 Diborane(4) compounds 1.3 Some aspects of binuclear coordinative compounds with guanidine 16 ligands 1.4 Aim of the present research 22 1.5 References 23 2. Results and discussion 29 2.1 Synthesis and characterization of new guanidine-borane adducts: 29 H B·hppH and H B·N(H)C(NMe ) 3 3 2 22.1.1 Synthesis 30 2.1.2 Spectroscopic properties 32 2.1.3 Structure determinations 37 2.1.4 Quantum chemical studies of the bonding properties in amine- and guanidine- 43 borane adducts 2.