Introduction

Synthesis and Characterization of a Metal Complex that Dissociates in the Excited State Charles Hicks and Robert DetigDepartment of Chemistry and PhysicsKean University1000 Morris Ave Union, NJ 07083

Introduction Absorption of light can lead to strengthening or weakening of chemical bonds. Recent studies of the complex trans-Ru(bpy)2(CN)2 Rh(NH3)4Br2+ suggest that the weakening of the CN-Rh bond is so extreme that the excited state may be better described as two separate species trapped in a solvent cage. In this work, a related bimetallic complex, cis-Ru(bpy)2(CN)2Co(NH3)4Cl2+ was synthe-sized. The shape of this complex will allow future studies to be performed to determine whether the CN-Co bond is cleaved after absorbing light.

x-phen + H+ x-phenH+ x-phen + M2+ x-phenM2+ Coordination Parallels Basicity Charles V. Banks, R. I. Bystroff; J. Am. Chem. Soc.;1959; 81(23); 6153-6158.

Absorbing light can lead to decreases in basicity • Excited state described as • (CN)2Ru(III)-(bpy)2- • Decrease in basicity of the CN • pka 5.0 • Emissive in aqueous solution Demas, J. N.; Peterson, S. J. Am. Chem. Soc. 98, 7881 (1976)

“Ru-Rh” Bimetallic • Emissive in aqueous solution • Photochemical decomposition • is pH dependent decomposition

Decomp max 0.19 fdec vs pH *Ru-Rh Ru + Rh dec peaks ~ pKa1 of (bpy)2Ru(CN)2 ~0.12 Fan, J.; Helmy, R.; Kassis, A.; Grunseich, A.; Mangubat, P.; Hicks, C.; Stevens, N.; Gafney, H. D.; Inorg. Chem.; (Communication) (2003), 42(8); 2486-2488.

H+ Traps Dissociated [Ru, Rh]

Formation of a Coordination Complex

Substitution of 2 Cl- for CO32-

Formation of Bimetallic Complex

Formation CN-Metal Bond

AcknowledgementStudents Partnering with Faculty Program of Kean University

Introduction

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INTRODUCTION/ INTRODUCTION

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INTRODUCTION

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Introduction