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Cp_2Cr_2(CO)_4(μ-η~2-P_2)C(M(CO)_5]_2(M=Mo(3),W(4)) are isostruc-tural to Cp2Cr2 (CO)4 (μ-η2-P2) [Cr (CO)5]2 (2) and crystallize in space group C2/c (No. 15) with a=18. 553(5),b=10. 462,c=16. 786(2)(2)A ,β=109. 84(1)°,V= 3064. 5(8)A3,Z=4,Mr = 880. 16,F(000) = 1712,and Dc=1.907 g/cm3 for 3,and a -18. 552(6),b= 10. 471 (2),c= 16. 768(2) A, β=109. 77(2)°,V = 3065(1) A3,Z = 4,Mr= 1055. 98,F(000) = 1968,and Dc = 2. 288g/cm3 for 4. This series of complexes share a virtually invariant Cr2(μ-η2-P2) central core with their parent complex Cp2Cr2-(CO)4(μ-η2-P2)(1).The Mo-P (2. 506(1) A) and W-P (2. 511(3) A) distances are longer than the corresponding Cr - P distance (2. 397(1)A) in complex 2 in accordance with the increase in covalent radii of the M atoms.
Cp2Cr_2 (CO) _4 (μ-η ~ 2-P_2) C (M (CO) _5] _2 (M = Mo (3), W (4)) are isostruc- tural to Cp2Cr2 (CO) 4 (2) and crystallize in space group C2 / c (No. 15) with a = 18. 553 (5), b = 10.462, c = 16.786 (2) A, β = 109.84 (1) °, V = 3064.5 (8) A3, Z = 4, Mr = 880.16, F (000) = 1712, and Dc = 1.907 g / cm3 (3) and a -18.52 (6), b = 10. 471 (2), c = 16. 768 (2) A, β = 109.77 (2) °, V = 3065 A3, Z = 4, Mr = 1055. 98, F (000) = 1968, and Dc = 2.288 g / cm3 for 4. This series of complexes shares a virtual invariant Cr2 (μ-η2-P2) central core with their parent complex The Mo-P (2.506 (1) A) and WP (2.501 (3) A) are longer than the corresponding Cr - P distance (2.397 (1) A) in complex 2 in accordance with the increase in covalent radii of the M atoms.