Table 3. Selected bond angles (°) for compounds 1–5.

	1	2	3	4	5
B1–N1–B2	126.15(15)	—	—	—	—
B1–N1–C1	117.15(14)	—	—	—	—
B2–N1–C1	116.41(14)	—	—	120.10(13) a	—
N2–Mg1–N1	—	90.19(6)	90.88(6)	95.26(5)	93.76(18) b
N1–Mg1–N3	—	119.63(6)	124.69(7)	132.20(6)	105.7(2) c , d
N2–Mg1–N3	—	122.98(7)	117.31(6)	115.45(5)	107.3(2) e , f
C30–N3–Mg1	—	136.56(13)	137.55(13)	150.55(12)	—
O1–Mg1–N3	—	—	—	71.91(5)	103.31(19) g , h

^aB1–N3–C30.

^bN3–Mg2–N4 93.44(18).

^cN1–Mg1–N5.

^dN3–Mg2–N6 103.53(19).

^eN2–Mg1–N5.

^fN4–Mg2–N6 105.5(2).

^gO1–Mg1–N5.

^hO2–Mg2–N6 97.01(13).