Dimolybdenum complexes containing anions of N,N′-bis(pyrimidine-2-yl)formamidine and N-(2-pyrimidinyl)formamide |
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| Authors: | Zhi-Kai Chan Tsun-Ren Chen Yow-Fu Tsai Jhy-Der Chen Ju-Chun Wang |
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| Institution: | 1. Department of Chemistry, Chung-Yuan Christian University, Chung-Li, Taiwan, ROC;2. Department of Applied Chemistry and Life Sciences, National Pingtung University of Education, PingTung, Taiwan, ROC;3. Department of Chemistry, Soochow University, Taipei, Taiwan, ROC |
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| Abstract: | The reactions of Mo2(O2CCH3)4 with different equivalents of N,N′-bis(pyrimidine-2-yl)formamidine (HL1) and N-(2-pyrimidinyl)formamide (HL2) afforded dimolybdenum complexes of the types Mo2(O2CCH3)(L1)2(L2) (1) trans-Mo2(L1)2(L2)2 (2) cis-Mo2(L1)2(L2)2 (3) and Mo2(L2)4 (4). Their UV–Vis and NMR spectra have been recorded and their structures determined by X-ray crystallography. Complexes 2 and 3 establish the first pair of trans and cis forms of dimolybdenum complexes containing formamidinate ligands. The L1 ligands in 1–3 are bridged to the metal centers through two central amine nitrogen atoms, while the L2 ligands in 1–4 are bridged to the metal centers via one pyrimidyl nitrogen atom and the amine nitrogen atom. The Mo–Mo distances of complexes 1 2.0951(17) Å], 2 2.103(1) Å] and 3 2.1017(3) Å], which contain both Mo?N and Mo?O axial interactions, are slightly longer than those of complex 4 2.0826(12)–2.0866(10) Å] which has only Mo?O interactions. |
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| Keywords: | Dimolybdenum complex Formamidinate ligand N N&prime -bis(pyrimidine-2-yl)formamidine N-(2-pyrimidinyl)formamide |
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