New hydrogen-bonded donor-acceptor pairs between dipyridylacetylenes and 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone

Organic Letters

Volumn 2, Issue 3, 2000, Pages 273-275

  Zaman, Md Badruz ^a,b   Tomura, Masaaki ^a   Yamashita, Yoshiro ^a  

^a INSTITUTE FOR MOLECULAR SCIENCE   (Japan)

^b UNIVERSITY OF DHAKA   (Bangladesh)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000308972     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol991229q     Document Type: Article

References (37)

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22. - were obtained from a mixture of methanol-acetone (1:1), both methanol and acetone, and acetone, respectively.
23. 2 = 0.1397, GOF = 1.00 for 659 data with I > 2σ(I).
24. 2 = 0.118, GOF = 0.94 for 1004 data with I > 2α(I).
25. 2 = 0.136, GOF = 0.97 for 1631 data with I > 2α(I).
26. 2 with SHELXL-93 (Sheldrick, G. M. SHELX93. A Program for the Refinement of Crystal Structure; Universität Göttingen, 1993) implemented on a Silicon Graphics computer.
27. 2 with SHELXL-93 (Sheldrick, G. M. SHELX93. A Program for the Refinement of Crystal Structure; Universität Göttingen, 1993) implemented on a Silicon Graphics computer.
28. 2]: C, 55.55; H, 2.59; N, 7.20. Found: C, 55.09; H, 3.18; N, 7.17.
29. 3, Z = 1; Zaman, M. B.; Tomura, M.; Yamashita, Y. Unpublished work.
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35. (f) Zaman, M. B.; Tomura, M.; Yamashita, Y.; Sayaduzzaman, M.; Chowdhury, A. M. S. CrystEngComm 1999, 9.
36. -1 support the deprotonation of anions.
37. The calculations of the atomic charge (PM3) of each nitrogen atom (2, -0.0607; 3, -0.0771; 4, -0.0742) support the degree of protonation provided by X-ray analyses of the complexes.