@misc { , title = {Rerefinement of (μ-1,7,11,17-tetraoxa-2,6,12,16-tetraazacycloeicosane-κ4N1,N17:N7,N11)bis[dichlorozinc(II)]. [Dataset]}, abstract = {This rerefinement of the title compound, [Zn2Cl4(C12H28­N4O4)], based on the original intensity data, differs from the original only in the exchange of the NH and O moieties of the oxa­aza-macrocycle, resulting in a dramatic improvement in the R factors and the anisotropic displacement parameters associated with the N and O atoms. The tetrahedral coordination of Zn involves Cl at 2.2144 (6) and 2.2279 (6) Å, but now N rather than O at 2.0563 (18) and 2.0934 (17) Å, in keeping with the usual arrangement for zinc complexes of this type. The revised model permits satisfactory N-H...Cl hydrogen bonds which the original did not. A crystallographic twofold axis passes through the centroid of the mol­ecule perpendicular to its least-squares plane. The accompanying file contains links to supplementary material.}, doi = {10.1107/s1600536802001654}, note = {INFO COMPLETE (Info via contact ) PERMISSION GRANTED ((Supplementary materials and supporting data - It is the practice of IUCr journals to provide free access to all supplementary materials and supporting data files deposited with a published article. Licencing of supplementary materials that represent an author's creative work (e.g. mathematical appendices, extended discussion, additional figures) follows that of the primary article. Copyright protection is not extended to files of scientific data (e.g. structural data CIFs, structure factors, primary diffraction images), and such data sets may be used freely for bona fide research purposes within the scientific community so long as proper attribution is given to the source from which they were obtained. [https://journals.iucr.org/services/authorrights.html] 27/3/2023 LM) DOCUMENT READY (27/3/2023 LM) ADDITIONAL INFO - Contact: Paul Kong Thoo Lin}, publicationstatus = {Published}, publisher = {International Union of Crystallography}, url = {https://rgu-repository.worktribe.com/output/1924754}, keyword = {NH moieties, O moieties, N and O atoms, Hydrogen bonds, Crystallographic}, year = {2002}, }