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The reaction of [RuCl2(PPh3)3] and closo-[B10H10]2- with p-IPhCOOH in CH2Cl2 solution affords two para-iodobenzoate exo-cyclized 11-vertex closo-ruthenaborane clusters [(PPh3)(p-IPhCO2)2RuB10H8] (1) and [(PPh3)2ClRu(PPh3)(p-IPhCO2)RuB10H9] ··· CH2Cl2 (2) that have been characterized by elemental analysis, FT-IR, 1H and 13C NMR spectra and single-crystal X-ray diffraction analysis. Both clusters are based on a closo-type C2v 1 : 2 : 4 : 2 : 2 RuB10 stack with the metal occupying the unique six-connected apical position. In 1, the metal center has three exo-polyhedral ligands: one triphenylphosphine and two native oxygen atoms of para-iodobenzoates. The other oxygen atoms of two para-iodobenzoates are additionally bonded to B(2) and B(3) atoms respectively, resulting in two exo-cyclic five-membered Ru-O-C-O-B rings and engendering a symmetrical conformation. For 2, the metal center also has three exo-polyhedral ligands, one triphenylphosphine and one para-iodobenzoate to form one exo-cyclic five-membered Ru-O-C-O-B ring. There is an additional exo-polyhedral ruthenium atom bonding to the {RuB10} center via a {Ru-Ru} linkage and two {RuHμB} bridges resulting in one closo distorted exo-polyhedral Ru(1)-Ru(2)-B(2)-B(4) tetrahedron. [ABSTRACT FROM AUTHOR]