title: Hydrogen-bonded extended arrays of the [Re6(mu3-Se)8]2+ core-containing clusters.
abstract: Site-differentiated solvated clusters of the general formula [Re(6)(mu(3)-Se)(8)(PEt(3))(n)(MeCN)(6)(-)(n)](SbF(6))(2) (n = 4, cis and trans; n = 5) undergo ligand substitution reaction with isonicotinamide to afford the corresponding amide derivatives, [Re(6)(mu(3)-Se)(8)(PEt(3))(n)(isonicotinamide)(6)(-)(n)](2+) [1 (n = 5); 2 (n = 4, trans); 3 (n = 4, cis)]. Retention of stereochemistry in each case was confirmed by (1)H and (31)P NMR. The solid-state structures of all three compounds were established crystallographically, which revealed self-complementary hydrogen-bonding interactions between adjacent cluster units. While complex 1 exists as hydrogen-bonded dimers in the solid state, compounds 2 and 3 form one-dimensional chains of clusters bridged by paired hydrogen bonds. It is the rigid stereochemistry of the cluster, combined with the classic crystal engineering motif of complementary N-H.O amide hydrogen bonding, that affords the predictable solid-state structures and dimensionality.
authors.affiliation: Department of Chemistry, University of Arizona, Tucson 85721, USA.
authors.forename: Hugh D
authors.initials: HD
authors.lastname: Selby
authors.forename: Bryan K
authors.initials: BK
authors.lastname: Roland
authors.forename: Michael D
authors.initials: MD
authors.lastname: Carducci
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Zheng