The effect of d10-d10 interaction: Ag2(tu)3(SO4)-H2O, a new helical coordination polymer based on a dinuclear silver unit.

Donor atom used for the interaction with metal, that allows unidentate and different bridging modes

Strong H-bonding donor, not used in coordination A considerable number of complexes of simple copper(I) salts, formed with thiourea (tu ; SC(NH2) ) and its simple substituted

derivatives, involving a wide variety of compositions and structures, have been reported in the past; In these compounds, “hard” anions associated are excluded from the coordination sphere while “soft” anions such as the heavier halide ions may be competitive. Much of the interest in this field derives from the many and varied structures that they show and the relevance of these in areas as diverse as bioinorganic chemistry and elettrochemistry. In contrast to the situation for copper(I), a considerably smaller number of silver(I) complexes of thiourea have been reported, with mainly mononuclear and binuclear structures being observed. Recently, the works of G. A. Bowmaker on this systems regenerate new interest, with some research on simple salts of this metal and detailed comparison with copper derivates, and new structural features of this system were discovered. One of the most interesting feature is that, although the presence of Ag2S2 squares are a common geometrical element, only in one monomeric binuclear complex and in

a little number of 2D-polymers the distance between metals are compatible with the presence of argentophilic interactions. In our derivate Ag₂(tu)₃(SO₄)-H₂O, these closed shell interactions are strong and in collaboration with the hydrogen bond net form a unique structure of great complexity. In our research we found also the structure of Ag2(tu)6(SO4)·6H2O, a more typical coordination

polymer of this family, and we compare it with the other structure in this presentation.

Introduction

Ag

(tu)

(SO

)·6H

O

Voids between the chains with the sulfate anions and the waters are involved in hydrogen bonds

Thiourea acting as µ2 bridge between metal centers, perpendicular to the chain

Thioureas acting as terminal ligand, parallel to the developing of the chain

The effect of d

10

-d

10

interaction: Ag

2

(tu)

3

(SO

4

)-H

2

O, a new

helical coordination polymer based on a dinuclear silver unit.

Emanuele Priola, Eliano Diana, Giuliana Gervasio, Elisabetta Bonometti

University of Turin, Departement of chemistry, Via Pietro Giuria 7

[email protected]