3 STRUCTURALLY RELATED DIMOLYBDENUM(III,III) COMPOUNDS - (PPH4)(2)[MO-2(OAC)(2)CL-6], (PPH4)(2)[MO-2(O2CPH)(2)CL-6] AND (PPH4)(2)[MO-2(OAC)(4)CL-4]

Three edge-sharing bioctahedral dimolybdenum (III, III) compounds (PPh 4)(2)[Mo-2(OAc)(2)Cl-6] (1), (PPh4)(2)[Mo(OAc)(2)Cl-6] (1), (PPh4)(2)[ Mo-2(O2CPh)(2)Cl-6]. 2CH(3)CN (2) and (PPh4)(2)[Mo-2(Oac)(4)Cl-4]. 2CH (3)CN (3) have been synthesized and characterized by X-ray crystallogr aphy. All three compounds can be synthesized either by an oxidative ad dition of Cl-2 to their corresponding Mo(II, II) compounds or by react ion of Mo2Cl6(THF)(3) with the corresponding carboxylate salts. In the crystal, the bridging position of compound 3 is disordered, occupied by either Cl- or mu, eta(1)-OAc- groups, due to the inclusion of [Mo-2 (OAc)(3)Cl-5](2-) anions. Crystallographic data are as follows: 1, tri clinic <P(1)over bar> with a = 9.004(2), b = 12.499(2), c = 12.863(2) Angstrom, alpha = 107.28(2), beta = 105.81(2), gamma = 99.72(2)degrees , V = 1279.9(4) Angstrom(3), Z = 1, R = 0.047, wR2 = 0.128; 2, triclin ic <P(1)over bar> with a = 11.3756(9), b = 13.4730(7), c = 10.9611(7) Angstrom, alpha = 02.39(5), beta = 102.509(6), gamma = 84.205(6)degree s, V = 1599.2(2) Angstrom(3), Z = 1, R = 0.043, wR2 = 0.120; 3, tricli nic <P(1)over bar> with a = 9.9874(7), b = 12.452(3), c = 13.071(4), a lpha = 78.06(3), beta = 71.30(1), gamma = 76.15(1)degrees, V = 1479.9( 6) Angstrom(3), Z = 1, R = 0.050, wR2 = 0.112. (C) 1997 Elsevier Scien ce S.A.