Abstract
The hydrogen acceptor capability of the sulfur atom in the biologically relevant N-2-pyridylmethyl-N′-arilthioureas was explored. N-2-Pyridylmethyl thioreas were selected to avoid the formation of intramolecular six-membered hydrogen-bonded ring. The compounds studied were N-2-pyridylmethyl-N′-phenylthiourea (1), N-2-pyridylmethyl-N′-2-methoxythiourea (2), N-2-pyridylmethyl-N′-4-methoxyphenylthiourea (3), and N-2-pyridylmethyl-N′-4-bromophenylthiourea (4). 1 crystallizes in the monoclinic space group P21/c, with a = 7.419(1) Å, b = 18.437(2) Å, c = 9.656(1) Å, β = 106.277(6)°, V = 1267.8(3) Å3, Z = 4. 2 crystallizes in the monoclinic space group P21/c, with a = 8.064(2) Å, b = 18.382(7) Å, c = 9.865(5) Å, β = 97.81(3)°, V = 1448.8(11) Å3, Z = 4. 3 crystallizes in the monoclinic space group P21/c, with a = 11.472(1) Å, b = 13.520(1) Å, c = 10.088(1) Å, β = 112.60(1)°, V = 1444.5(2) Å3, Z = 4. 4 crystallizes in the triclinic space group P-1, with a = 4.583(3) Å, b = 10.263(3) Å, c = 14.396(3) Å, α = 77.92(2)°, β = 88.55(4)°, γ = 80.02(4)°, V = 652.1(5) Å3, Z = 2. Both thiourea N–H groups form intermolecular hydrogen bonds, one with the thione sulfur atom and the other with the pyridine nitrogen atom but the H-bonding schemes are not the same maybe due to the flexibility of the molecules.
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Valdés-Martínez, J., Hernández-Ortega, S., Rubio, M. et al. Study of the sulfur atom as hydrogen bond acceptor in N(2)-pyridylmethyl-N′-arylthioureas. Journal of Chemical Crystallography 34, 533–540 (2004). https://doi.org/10.1023/B:JOCC.0000042022.16392.99
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DOI: https://doi.org/10.1023/B:JOCC.0000042022.16392.99