Fig. 6: The molecular structures of 4·B(OH)3, 5 and 6.
From: Carbon dioxide capture and functionalization by bis(N-heterocyclic carbene)-borylene complexes
a The molecular structure of 4·B(OH)3 obtained by X-ray crystallography. Thermal ellipsoids are shown at 50% probability. All hydrogen atoms except for those on boric acid are removed for clarity. Selected bond lengths (Å) and angles (deg): C1-B1 1.6532(16), C8-B1 1.6514(17), C15-B1 1.6608(17), C24-B1 1.6810(17), C24-O1 1.2790(14), C24-O2 1.2643(14), C1-B1-C8 114.24(9), C1-B1-C15 112.85(9), C8-B1-C15 106.30(9), O1-C24-O2 121.60(11), O1-C24-B1 119.45(10), O2-C24-B1 118.68(10). b The molecular structure of 5 obtained by X-ray crystallography. Thermal ellipsoids are shown at 50% probability. All hydrogen atoms except for those on the boron and formate are removed for clarity. Selected bond lengths (Å) and angles (deg): C1-B1 1.635(4), C8-B1 1.621(4), C15-B1 1.622(4), C24-O1 1.223(4), C24-O2 1.210(4), O1-C24-O2 133.6(4), C1-B1-C15 117.2(2), C1-B1-C8 108.4(2), C8-B1-C15 116.3(2). c The molecular structure of 6 obtained by X-ray crystallography. Thermal ellipsoids are shown at 50% probability. All hydrogen atoms except for those on the boron and carbamate are removed for clarity. Selected bond lengths (Å) and angles (deg): C1-B1 1.618(3), C4-B1 1.631(3), C3-B1 1.643(3), C9-O1 1.246(2), C9-O2 1.268(2), C9-N5 1.406(2), C1-B1-C4 111.65(15), C1-B1-C3 115.09(16), C3-B1-C4 111.65(15), O1-C9-O2 126.14(18), O1-C9-N5 119.53(17), O2-C9-N5 114.33(17).
