Table 1. Selected Distances (Å) and Angles (°) for Compounds 4–10, 12–15, and 17^a.

compound	C(Cp)–Ub	C(Cp)–Uc	Cp(cent)–Ub	U–X	Cp(cent)–U–Cp(cent)	X–U–X/Y
4	2.809(6)	2.745(6) to 2.864(6)	2.533(6)	N(1) 2.021(5), N(2) 2.426(6)	130.8(2)	93.2(2)
5	2.836(3)	2.741(3) to 2.945(3)	2.564(3)	O(1) 1.873(2), N(1) 2.526(3)	128.2(1)	87.2(1)
6	2.788(7)	2.741(6) to 2.824(6)	2.511(6)	S(1) 2.437(1), N(1) 2.509(5)	134.0(2)	95.9(1)
7	2.784(4)	2.741(5) to 2.827(5)	2.505(5)	Se(1) 2.583(1), N(1) 2.507(4)	135.2(2)	96.5(1)
8	2.758(4)	2.714(4) to 2.803(4)	2.476(4)	O(1) 2.071(3), Cl(1) 2.820(1)	129.2(1)	91.8(1)
9	2.776(6)	2.727(6) to 2.823(5)	2.493(3)	O(1) 2.077(3), I(1) 2.963(1)	128.3(2)	93.3(1)
10	2.757(4)	2.698(3) to 2.807(4)	2.474(3)	O(1) 2.067(2), N(1) 2.525(4)	130.1(1)	92.3(1)
12	2.816(5)	2.745(5) to 2.905(5)	2.541(5)	O(1) 2.114(4), O(2) 2.109(3)	125.2(2)	91.7(1)
13	2.770(13)	2.737(13) to 2.803(12)	2.496(12)	O(1) 2.214(9), S(1) 2.748(3) N(2) 2.530(10)	127.9(3)	61.2(2)d
14	2.737(5)	2.683(4) to 2.783(5)	2.453(4)	S(1) 2.608(2), I(1) 2.944(1)	130.3(2)	100.2(1)
15	2.769(7)	2.722(7) to 2.833(7)	2.489(6)	S(1) 2.755(1), S(2) 2.724(1) N(2) 2.565(5)	131.0(2)	65.1(1)e
17	2.784(7)	2.684(7) to 2.892(7)	2.506(7)	U(1) Se(1) 2.763(1), Se(2) 2.758(1) U(2) Se(1) 2.761(1), Se(2) 2.758(1)	119.5(2)	79.7(1)

^aCp = cyclopentadienyl ring.

^bAverage value.

^cRange.

^dThe angle of O(1)-U(1)-S (1).

^eThe angle of S(1)-U(1)-S(2).