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Synthesis, Characterization and Crystal Structures of [Mo(CO)(4)](2)TPTA and [W(CO)(4)](2)TPTA (TPTA = 1, 4, 8, 11-Tetrakis(methyldiphenylphosphino)-1, 4, 8, 11-tetraazacyclotetradecane)

1, 4, 8, 11-Tetrakis(methyldiphenylphosphino)-1, 4, 8, 11-tetraazacyclotetradecane (TPTA) reacts with molybdenum(0) and tungsten(0) hexacarbonyls to give yellow crystalline diamagnetic complexes of the formula [M(CO)(4)](2)TPTA. Each metal atom in these binuclear species is coordinated by two phosphorus atoms from the pendant methyldiphenylphosphino groups and by four carbonyls in a cis octahedral arrangement.

molybdenum ; tungsten ; carbonyl ; binuclear complexes ; tetraazamacrocyclic ligands ; pendant arms ; crystal structures

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